EUROPA - ExNBG Clarification Sheets Noted by the ATEX ... · EC-Type Examination Certificate 30/06/00 03/11/00 01/12/05 00/029 1.0 EN 50014:1977 Clause 7 and EN 50014:1992 clause

European Commission Page 1 of 4 December 2009

EXNBG CLARIFICATION/DECISION SHEETS NOTED BY THE ATEX STANDING COMMITTEE STATUS ON DECEMBER 2009

Number ExNB/CS/

DS (1) Edition Subject / Keywords

Approved by

ExNBG (2) Authorized

/ Issued Noted by ATEX SC

(3) 98/06/001 1.0 Certification of a torch according to EN

50020:1977 clauses 9 and 9.4.12 or EN 50020:1994 clauses 10 and 10.4.2

17/06/98 07/08/98 01/12/05

98/06/006 1.0 Conformity to type Notification Format (ATEX Directive Annex VI)

17/06/98 07/08/98 01/12/05

98/06/007 1.0 EN 50019:1994 - Internal contacts on zoned heating tapes

17/06/98 07/08/98 01/12/05

98/06/010 1.0 Minimum requirement for thread engagement/NPT cable entry holes in flameproof apparatus to EN 50018

17/06/98 07/08/98 01/12/05

99/06/014 1.0 EN 50020:1977 sub-clause 7.2 and EN 50020:1994 sub-clause 7.4 - Voltage source of EEPROMs etc.

16/06/99 10/02/00 29/06/01

99/06/015 1.0 EN 50020:1977 sub-clause 7.2 and EN 50020:1994 sub-clause 12.2 - "EEX ib"

16/06/99 10/02/00 29/06/01

99/06/016 1.0 EN 50020:1977 and EN 50020:1994 - Marking of apparatus with alternative protection "d" or "i"

16/06/99 10/02/00 29/06/01

99/06/017 1.0 EN 50020:1977 and EN 50020:1994 sub-clause 6.4.6 - Calculation of multiple separation distances

16/06/99 10/02/00 29/06/01

99/06/018 1.0 EN 50020:1977 sub-clause 5.5 and EN 50020:1994 sub-clause 6.4.1 - Separation for insulated components

16/06/99 10/02/00 29/06/01

00/06/020 1.0 EC-Type Examination for Category 3 products 29/09/00 03/11/00 27/11/09 00/06/023 1.0 Recommendations on the measurement of the

maximum temperature of light transmitting parts of products intended for use in potentially explosive atmospheres using thermocouples

30/06/00 03/11/00 08/12/00

00/06/024 1.0 EN 50020:1994, clause 6.5 "Protection against polarity reversal"

30/06/00 03/11/00 08/12/00

00/06/025 1.0 Short temperature rise of Ex p motors during starting

30/06/00 03/11/00 08/12/00

00/06/026 1.0 Change of the standard wording of Article 11 of the EC-Type Examination Certificate

30/06/00 03/11/00 01/12/05

00/029 1.0 EN 50014:1977 Clause 7 and EN 50014:1992 clause 8, light alloys in Group I apparatus

09/03/04 01/12/05

00/031 1.0 EN 50018:1977 Clause 4.1.3 and EN 50018:1994 Clause 5.2.3, rectangular spigot joints

09/03/04 01/12/05

00/033 1.0 EN 50028:1987 Clause 4.1.2, internal voids 09/03/04 01/12/05 00/034 1.0 Procedural - Ex-components, indication of the

temperature class in the marking 09/03/04 01/12/05

00/035 1.0 Certificate of Conformity of a flameproof enclosure containing different components

09/03/04 27/11/09

00/037 1.0 EN 50014:1977 Clause 13 and EN 50014:1992 Clause 15, earthing of traction batteries

09/03/04 01/12/05

00/038 1.0 Procedural - Group I component certificates marked with the epsilon-x in the same way as Group II

27/11/09

00/039 1.0 EN 50018:1977 Clause 14 and EN 50018:1994 Clause 15, heating cables

09/03/04 01/12/05

00/041 1.0 EN 50019:1977 Clause 4.6.1.5 and EN 50019:1994 Clauses 5.6.1.5 & 5.6.2.1, materials used inside battery containers

09/03/04 01/12/05

00/042 1.0 EN 50018:1977 Clause 6 and EN 50018:1994 Clause 7, wear-push rods and spindles in flameproof enclosures

09/03/04 01/12/05


Number ExNB/CS/


Approved by



(3) 00/045 1.0 EN 50018:1977 Clause 12.1 and EN 50018:1994

Annex C, cable entry seal under tension 09/03/04 01/12/05

00/046 1.0 EN 50018:1977 Clause 3 and EN 50018:1994 Clause 4, T Class for EEx d motors

09/03/04 01/12/05

00/047 1.0 EN 50014:1977 Clause 7 and EN 50014: 1994 Clause 8, light alloys

09/03/04 01/12/05

00/048 1.0 EN 50018:1977 Clause 10 and EN 50018:1994 Clause 11, non ISO threads

09/03/04 01/12/05

00/049 1.0 EN 50014:1992 Clause 13, interchangeablity of Group I and Group II components

09/03/04 01/12/05

00/051 1.0 EN 50019:1977, ventilation and IPX3 testing of batteries

09/03/04 01/12/05

00/052 1.0 EN 50019:1977, dielectric strength tests for junction boxes

09/03/04 01/12/05

00/053 1.0 EN 50014:1977 Clause 6.3 and EN 50014:1992 Clause 7.3.2, electrostatic hazard

09/03/04 01/12/05

00/054 1.0 EN 50014:1977 Clause 16 and EN 50014:1992 Clause 17, fans

09/03/04 01/12/05

00/055 1.0 Cables ends or cables between parts of apparatus for types of protection other than intrinsic safety

09/03/04 01/12/05

00/056 1.0 EN 50018:1977 Clause 3 and EN 50018:1994 Clause 14, frequency converters and EEx d motors

09/03/04 01/12/05

00/02/059 1.0 Temperature rise tests, flameproof motors, frequency converters, thermal protection, general methodology

21/02/00 10/02/00 29/06/01

99/11/060 1.0 Plastic parts, on which the safety of type of protection "Flameproof Enclosure" depends

10/11/99 10/02/00 29/06/01

99/06/061 1.0 EN 50018 - Flexible walls, flameproof enclosures 16/06/99 10/02/00 29/06/01 98/063 1.0 Test for cells and batteries; EN 50020:1994; 10.9 15/06/01 06/02 01/12/05 98/064 1.0 EN 50020:1994 - Rating of components related to

associated apparatus with galvanic isolation. Reference HOTL (95)CESI/001

08/06/00 06/01 01/12/05

98/066 1.0 rev. 1

EN 50020:1994 sub-clause 6.4.7 and 6.4.8 - Verification of CTI for 'i'

09/09/02 01/12/05

99/06/069 1.0 EN 50018:1994 - Gas analysis performed within a flameproof enclosure

16/06/99 10/02/00 29/06/01

99/01/071 1.0 Outcome of the assessment (Clause 3.3 of Annex IV and Annex VII)

15/04/99 28/05/99 01/12/05

99/11/074 1.0 Impact test of non metallic enclosures (or enclosure parts)

10/11/99 10/02/00 29/06/01

99/11/075 1.0 Marking of associated apparatus according to EN 50020

10/11/99 10/02/00 29/06/01

99/080 Proposal to modify the standard wording on EC-Type Examination Certificates

08/06/00 27/11/09

99/082 1.0 Instructions and EC-type examination 30/06/00 03/11/00 01/12/05 99/084 1.0 Apparatus with a measuring function for explosion

protection where a part is situated in an explosive atmosphere

09/06/00 06/01 01/12/05

99/086 1.0 Handling and storage of the dossier for non-electrical equipment category M2 and 2 according to Annex VIII, paragraph 3

08/06/00 06/01 01/12/05

00/093 1.0 Flame arresters (autonomous protective systems), assessment of test results obtained under instable detonation conditions

15/06/01 14/12/01 01/12/05

00/095 1.0 Structure of and requirements for EC-Type Examination Certificates of flame arresters

15/06/01 14/12/01 01/12/05

01/101 1.0 Ex e temperature rise test according to EN 50014 and EN 50019 standards concerning electrical motors

15/01/01 06/02 01/12/05


Number ExNB/CS/


Approved by



(3) 01/105 1.0 EC-type examination of gas detectors

incorporating a measuring function for explosion protection

15/01/01 14/10/01 01/12/05

01/106 1.0 EC-type examination of gas detectors incorporating a measuring function for explosion protection

15/01/01 14/12/01 01/12/05

01/107 1.0 Guidelines on the management of assessment and surveillance programmes for products covered by Annex IV and VII of the ATEX Directive 94/9/EC

15/01/01 14/12/01 01/12/05

02/110 1.0 Requirements and test procedure for heating equipment of explosion venting devices

10/09/02 07/03/03 27/03/02

02/111 1.0 Equipment with connections between areas covered by directive 94/9/EC and areas with high pressure

18/06/03 27/11/09

02/112 1.0 EC-type examination of gas detectors incorporating a measuring function for explosion protection

18/06/03 27/11/09

02/113 1.0 EC-type examination and supervision of production for gas detectors incorporating a measuring function for explosion protection

18/06/03 27/11/09

02/114 1.0 Distribution, availability and definition of the "Relevant information" to be "communicated" to other notified bodies following issue or withdrawal of EC-type Examination Certificates, Production QA Notification Certificates and Product QA Notification Certificates

18/06/03 27/11/09

00/124 1.0 EN 50019:1977 Ex "e" rated voltage windings 09/03/04 01/12/05 00/125 1.0 EN 50020:1977 and EN 50020:1994 - T-class for

small coils 09/03/04 01/12/05

00/126 1.0 EN 50028:1987 Clause 6.2.1, rated voltage and external fault conditions

09/03/04 01/12/05

00/127 1.0 EN 50014:1977 Clause 22.4.3 and EN 50014:1992 Clause 23.4.3, guards for light transmitting parts

09/03/04 01/12/05

00/128 1.0 EN 50018:1977 Clause 8 and EN 50018:1994 Clause 9, glass windows directly fused into the metallic housing

09/03/04 01/12/05

00/129 1.0 EN 50019:1977, trace heating tapes 09/03/04 01/12/05 00/130 1.0 EN 50028:1987 Clause 8.1.4 Permitted

Prospective Short Circuit Current 09/03/04 01/12/05

03/131 1.0 Equipment with a measuring function for explosion protection, drop test for remote sensors of fixed apparatus

09/03/04 01/12/05

03/132 1.0 Equipment with a measuring function for explosion protection, high gas concentrations above the measuring range

09/03/04 01/12/05

03/133 1.0 Equipment with a measuring function for explosion protection, battery capacity

26/11/04 24/05/05 01/12/05

03/134 1.0 Equipment with a measuring function for explosion protection, examination of catalytic sensors of portable multigas apparatus

09/03/04 01/12/05

04/160 Radio frequency power limitation 26/11/04 24/05/05 01/12/05 04/161 Instructions for high volume, low value equipment 25/11/04 24/05/05 27/11/09 04/170 Control units for gas warning equipment 26/11/04 24/05/05 01/12/05 05/190 Fluorescent lamps in Ex-luminaires 26/11/04 24/05/05 01/12/05 07/264 Content of technical documentation 28/11/06 30/07/07 27/11/09 07/265 Scope of EN 13980 in addressing Annex IV and

VII 28/11/06 30/07/07 27/11/09

07/266 Application of the latest technical knowledge 28/11/06 30/07/07 27/11/09 07/267 Structure of and requirements for EC-Type 28/11/06 30/07/07 27/11/09


Number ExNB/CS/


Approved by



(3) Examination Certificates for flame arresters

07/268 Proposal for amendment to Annex of EN 13980 28/02/07 30/07/07 27/11/09 07/269 Proposal for amendment to Annex of EN 13980 28/02/07 30/07/07 27/11/09 07/282 Ex q faults and overloads 20/10/08 27/11/09 07/283 IP Testing of Enclosures with non-metallic parts

(gaskets) 20/10/08 27/11/09

09/338 Instructions and year of manufacture 28/11/08 28/02/09 27/11/09

(1) : ExNB / xx.xx.xxx / CS/DS = European ATEX Notified Bodies / Numbering of the Clarification/Decision Sheet / CS/DS

(2) : ExNBG = European ATEX Notified Bodies Group (3) : ATEX SC = ATEX Directive 94/9/EC Standing Committee

ExNB

Co-ordination of Notified Bodies Equipment

for use in potentially explosive atmospheres on Council Directive

94/9/EC (ATEX)

Page 1 of 1

This ExNB Interpretation/Clarification Sheet has the sole purpose of clarifying the application of the EN Standards and/or of the requirements of Directive

94/9/EC and related documents. It does not in any way change the content of the standards and/or of the requirements. It remains valid until an official

answer is received from the European Commission of the relevant standardization bodies.

G:\ARCHIV\EG-Sekretariate\Explosionsschutz\Allgemeines\Entzippt\ExNB00-29CS.DOC

European ATEX Notified Bodies Group

Clarification/Decision Sheet N° ExNB/00/29/CS Editon 1.0

Original in English

Status: Step*5.2.1 Question Originator HOTL 34.021 Date:

Step*5.2.3 Initial proposal Proposer: Date:

Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 clause 7 and EN 50014:1992 Clause 8, Light Alloys in Group I Apparatus

Authorised by Chairman: M. Shearman Date: 2004.03.09

Date of application: Signature: M D Shearman Question: Can portable apparatus, with enclosures of light alloy be certified for Group I? Answer: Yes, provided a tight fitted or secured leather case is used.

1 Current wording relates to 76/117/EEC, may be superseded

ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 4.1.3 and EN 50018:1994 Clause 5.2.3, Rectangular Spigot Joints


Date of application: Signature: M D Shearman Question: Are spigot joints with a rectangular shape/section, (with or without rounded

corners), consisting of a flat part and a spigot part permitted without restrictions? Answer: Yes. These are permitted without restriction provided that the minimum values of

width of joint and of maximum gap indicated in tables 3 and 4 of EN 50018:1977 or in tables 1 and 2 of EN 50018:1994 are observed. However, when there is no flat part of the spigot joint acetylene is excluded from Group IIC.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50028:1987 Clause 4.1.2 Internal Voids

Authorised by Chairman: M. Shearman Date: 2004.03.09 Date of application: Signature: M D Shearman Question: Clause 4.1.2 of EN 50028 permits internal voids up to 100cm3. Is it permitted to

include larger components where the enclosed space is filled with loose inert material, for example glass beads, in order to reduce the free volume below 100cm3?

Answer: No


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: Procedural


Date of application: Signature: M D Shearman Question: Are Ex-components to be certified without any indication of the temperature class

in the marking? Answer: Yes, additional data such as power dissipation before a temperature class is

reached may, however, be included in the test certificate if it is an aid to draw up a certificate of conformity.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English

Status: Step*5.2.1 Question Originator HOTL Date:

Step*5.2.3 Initial proposal Proposer: HOTL Date:

Step*5.2.4 Responses/Final Draft HOTL 38.011 Date: *Step refers to ExNB Rules Subject: Certificate of Conformity of a Flameproof Enclosure Containing Different Com-ponents

Authorised by Chairman: M. Shearman Date: Date of application: Signature: Question: What requirements need to be applied to certificates of conformity for Ex d enclo-

sures, which can have different components built into them? Answer: The criteria for certificates of Conformity for “d” enclosures with different compo-

nents to be built in, is as follows:

a) A certificate should be issued for each specific apparatus (for example a measuring instrument, junction box or control unit);

b) The electrical characteristics of the apparatus should be specified; c) The documents mentioned on the certificate should include a list of compo-

nents mounted in the enclosure and a schematic representation of their layout;

d) Installation of intrinsically safe circuits in enclosures should be restricted to special cases indicated in documents. This should also apply to capacitors and hot surfaces


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 Clause 13 and EN 50014:1992 Clause 15 Earthing of Traction Batteries


Date of application: Signature: M D Shearman Question: Can a certificate of conformity be issued for a traction battery without an internal

and/or external earth, being in proper electrical contact with the chassis by installation requirements?

Answer: Yes


ExNB



94/9/EC (ATEX)

Page 1 of 1




U:\Common\09 ATEX\06 Notified Bodies\clarification sheets\Valid_clarification_sheets\ExNB00-038CS.DOC



Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: Directive, 94/9/EC Article No.

Directive, ESR No.

Directive, Module Annex No.

Standard, No.

Authorised by Chairman: M. Shearman Date:

Date of application: Signature: Subject: Procedural Question: Can Group I component certificates be marked with the epsilon-x in the same way as Group II? Answer: Yes

1 May be superseded by CS of ExNB

ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 14 and EN 50018:1994 Clause 15, Heating Cables

Authorised by Chairman: M. Shearman Date: 2004.03.09 Date of application: Signature: M D Shearman Question: Are bending tests required for heating cables complying with the Flameproof

design according to the standard EN 50018 and of which the enclosure consists of a flexible sheath and is earth fault protection required?

Answer: Yes, they shall be submitted to the bending tests foreseen by amendment 4 of the

standard EN 50019. Also an earth fault shall be foreseen and so an electrical protection device in relation to an earth fault is required.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50019:1977 Clause 4.6.1.5 and EN 50019:1994 Clauses 5.6.1.5 & 5.6.2.1 Materials used inside Battery Containers


Date of application: Signature: M D Shearman Question: For materials used in the construction of a battery, what procedure should be used

to determine that the requirements of clause 4.6.1.5 of EN 50019 are fulfilled? Answer: 1) The manufacturer sends to the testing station a declaration, dated and signed to

attest that the requirements of clause 4.6.1.5 of EN 50019 are fulfilled. 2) In case of doubt the testing station may carry out the control.

Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 6 and EN 50018:1994 Clause 7, Wear -Push Rods and Spindles in Flameproof Enclosures


Date of application: Signature: M D Shearman Question: What criteria is to be used, to determine if the wear experienced by a push rod or

spindle will be sufficient to affect the Flameproof properties of a joint and consequently whether or not bearings are required?

Answer: This is a matter of engineering judgement but where doubt exists, life testing of the

assembly followed by transmission testing under the most adverse conditions will be undertaken.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 12.1 and EN 50018:1994 Annex C, Cable Entry Seal Under Tension


Date of application: Signature: M D Shearman Question: Can a cable entry be certified in which the seal operates under tension rather than

under compression? Answer: Yes, the cable entry can be dealt with as a part of a plastic enclosure and can be

certified if the component withstands all tests specified for plastic enclosures.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 3 and EN 50018:1994 Clause 4 T Class for EEx d Motors

Authorised by Chairman: M. Shearman Date: 2004.03.09 Date of application: Signature: M D Shearman Question: With respect to the determination of temperature class of flameproof motors, is the

use of thermal switches generally accepted to limit the temperature within the required values and is this always sufficient?

Answer: The use of thermal switches is generally accepted to limit the temperature within

the required values. The thermal detectors in windings are not always sufficient to ensure the temperature limitation; in particular, in the case of inverter fed motors, temperature rises in bushings and bearings must be taken into account.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 Clause 7 and EN 50014: 1994 Clause 8, Light Alloys

Authorised by Chairman: M. Shearman Date: 2004.03.09 Date of application: Signature: M D Shearman Question: Does the relaxation of clause 8.3 of EN 50014:1992 refer to portable measuring

instruments? Answer: Yes


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 10 and EN 50018:1994 Clause 11, Non ISO Threads


Date of application: Signature: M D Shearman Question: Are non-ISO threads permitted to be used for special fasteners in flameproof

enclosures? Answer: No Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English

Status: Step*5.2.1 Question Originator HOTL 47.05.031 Date:


Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1992 Clause 13 Interchangeablity of Group I and Group II Components


Date of application: Signature: M D Shearman Question: Are Group II certified components acceptable in Group I apparatus and vice-

versa? Answer: Yes, the respective Standard requirements are identical for both Groups Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50019:1977 Ventilation and IPX3 Testing of Batteries


Date of application: Signature: M D Shearman Question: Are peak values of hydrogen concentration permitted, when testing the ventilation

of batteries complying with EN 50019, Amendment 2. Also is an IPX3 test obligatory?

Answer: Peak values of hydrogen concentration are permitted as long as the high concentration occurs for less than 30 minutes. A practical test of IPX3 is not obligatory; experience with similar constructions may be used. If a practical test is carried out and water enters the enclosure, the insulation resistance test as described in 5.5.1 of EN 50019/A2 must be passed successfully, to show that the quantity of water is not harmful. Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50019:1977, Dielectric Strength Tests for Junction Boxes.


Date of application: Signature: M D Shearman Question: For EExe junction boxes equipped by the manufacturer with approved

components, should the routine dielectric strength test be carried out with the components wired and if so how should the test be carried out?

Answer: Yes, the test shall be carried out according to the following standards:

- industrial control equipment: EN 60947 - measurement control and laboratory use: EN 61010

Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 Clause 6.3 and EN 50014:1992 Clause 7.3.2, Electrostatic Hazard.


Date of application: Signature: M D Shearman Question: Is it permissible to mark with a warning label, (visible to the user), fixed enclosures

or parts of enclosures of plastic material of any size, if the usage does not imply the hazard of electrostatic charge?

Answer: Yes, but it is not appropriate to use a warning if:

- There is a rapid airflow (e.g. air flow meters, fans air guides, equipment intended to be installed in a mine gallery subject to forced ventilation, etc.)

- The surface is intended to be touched frequently in service (e.g. keyboards, switches, windows likely to be cleaned frequently, touch screens on Visual Display Units).

Note: The use of an electrostatically harmless (e.g. leather) additional case is acceptable

with X-marking for hand held apparatus


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 clause 16 & EN 50014:1992 clause 17 - Fans


Date of application: Signature: M D Shearman Question: Do the requirements according to clause 16 of EN 50014:1977 (clause 17 of EN

50014:1992) apply for Group II fans for air-conditioning ('e' or 'd' motors with fan blades, hood etc) for a Certificate of Conformity?

Answer: Yes they do. For fans intended to be mounted in ventilation duct systems the

requirements for IP-protection and associated requirements for the parts providing the IP-protection (e.g impact test, light alloy enclosures) can also be fulfilled at the inlet and outlet of the duct. This shall be stated by X-marking and corresponding conditions in the certificate.

Note: Based on the HOTL-decision according to item 4 (Decision 6.1) in the Minutes of the 50th meeting of HOTL (16-18 October 1996).


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: Cables ends or cables between parts of apparatus for types of protection other than intrinsic safety


Date of application: Signature: M D Shearman Question: For apparatus with type of protection other than intrinsic safety with cable ends or

cables between parts of such apparatus, what shall be verified? Answer: The following shall be verified: -

- requirements or tests in the standard regarding dielectric strength - cables entering enclosures through compression glands shall have correct size

for the gland. - cables entering “d” enclosures shall be effectively filled. - Where appropriate the following may be covered by special conditions for safe

use and installation (X-marking) 1. The cable shall be installed in a way which provides for mechanical protection 2. The cables shall be suitable for the environmental use

Note: Requirements, which shall not be applied or considered include: • Cable length • Conductor Area (except when relevant to temperature classification) • Fire Propagation Properties


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 3 and EN 50018:1994 Clause 14, Frequency Converters and EEx d Motors


Date of application: Signature: M D Shearman Question: What shall be verified if an EEx d motor is energised through a frequency

converter? Answer: The following shall be verified:

- temperature rise of the motor in combination with the converter. - thermal protection is provided in or on the motor windings.

Note: thermal protection in or on the motor winding is not necessary if the converter is specified and included in the certificate.

- In all cases the protection efficiency means shall be tested.


ExNB

Co-ordination of Notified Bodies Electrical Equipment


94/9/EC (ATEX)

Issued:




ExNB98-066rev1CS EN 50020-1994 sub-clause 6.4.7 and 6.4.8 - Verification of CTI for 'i'.DOC


Clarification/Decision Sheet N° ExNB/98/066/CS rev.1 Editon 1.0

Original in English

Status: Step*5.2.1 Question Originator HOTL(96)SP/006 Date: 1996-11-07

Step*5.2.3 Initial proposal Proposer: 2nd ExNB Meeting

Date: 1998-06-17

Step*5.2.4 Responses/Final Draft 5th ExNB meeting Date: 14/06/20

01

1st

amendment Date: 09/09/02

*Step refers to ExNB Rules

Subject: Directive, 94/9/EC Article No.

Directive, ESR No.


Standard, No. EN 50020:1994 sub-clause 6.4.7 and 6.4.8 - Verification of CTI for 'i'

Authorised by Chairman: M. Shearman Date: 09/09/02

Date of application: Signature:

Subject: EN 50020:1994 sub-clause 6.4.7 and 6.4.8 - Verification of CTI for 'i' Question 1: How shall CTI for PCBs, with creepage distances on which intrinsic safety depends, be

verified? Answer: By making own CTI measurements or measurements by a sub-contracted laboratory or

accept CTI values provided by the apparatus manufacturer backed up with evidence of quality assured measurement (e.g. accredited test report) according to the correct test procedure (IEC 60112:1979). CTI values together with a reference to the correct test procedure (IEC 60112:1979) specified in the documentation by the apparatus manufacturer or manufacturer of the PCB, can also be accepted if backed up by experience of the laboratory.

Question 2: For which cases shall CTI be verified for coated PCBs? Answer: CTI shall be verified for both coated and uncoated PCB, irrespective of if conductive parts protrude through the coating or not.

- 2 -

ExNB98-066rev1CS EN 50020-1994 sub-clause 6.4.7 and 6.4.8 - Verification of CTI for 'i'.DOC

However, for PCBs with coating according to sub-clause 6.4.8 and with no conductors emerging from the coating (including no conductive parts with sharp edges), CTI need not to be verified for neither coated nor uncoated samples of the PCB.

ExNB



94/9/EC (ATEX)

Issued:




EXNB02-111CS Equipment with connections between areas covered by directive 94-9-EC and areas with high pressure.DOC



Original in English

Status: Step*5.2.1 Question Originator WG/98/9 Date: 16/02/01

Step*5.2.3 Initial proposal Proposer: WG/98/9 Date: 16/02/01

Step*5.2.4 Responses/Final Draft Date:



Directive, ESR No. 94/9/EC Annex


Standard, No.



Equipment with connections between areas covered by directive 94/9/EC and areas with high pressure Question: Does conveying equipment where some parts but not all are under atmospheric pressure with internal pressures different from atmospheric pressure fall under the scope of directive 94/9/EC and should the assessment of the equipment take into account the increasing hazards associated with these other pressures?

Answer: Yes. Since conveying equipment is covered by the Directive 98/37/EC for machinery, a risk assessment has to be performed including the risk of explosion independent of the question whether the equipment is matter of Directive 94/9/EC. When performing this risk assessment it will become evident that although parts of the described equipment are outside the scope of Directive 94/9/EC during normal operation (pressure oscillates between too low and too high values in relation to "atmospheric conditions") some parts or spaces still are under the scope and that the whole equipment during start and shut down is under the scope, at least. So both of the following examples fall under the scope of Directive 94/9/EC.

- 2 -

EXNB02-111CS Equipment with connections between areas covered by directive 94-9-EC and areas with high pressure.DOC

ANNEX Examples:

1. Vapour recovery pump for petrol stations The pump is sucking the petrol vapour air mixture from the atmosphere and is conveying it into a zone 0 pipe. Accordingly it is connected at its inlet and outlet to a potentially explosive atmosphere. It is itself placed in a zone 1 environment. Accordingly all outer parts of the pump are connected to a hazardous area. It is the aim of all the protections measures of the pump to avoid the ignition of all connected hazardous areas, no matter if the ignition sources are inside or outside the pump. 2. Vacuum pump sucking from a vacuum container and conveying the mixture into a pressure vessel or

pressure line

In this case the inner parts of the pump are not connected to an atmospheric environment, and accordingly only the outer parts of the pump are covered by both ATEX regulations. (The manufacturer may wish to sell this equipment for atmospheric use of the inlet and outlet side additionally, and then case 1 applies).

ExNB



94/9/EC (ATEX)

Issued:




EXNB02-112CS EC-type examination of gas detectors incorporating a measuring function for explosion protection.DOC



Original in English







EC-type examination of gas detectors incorporating a measuring function for explosion protection Question: When does Annex II, Clause 1.5 of directive 94/9/EC apply if performing EC Type examination of gas detectors that incorporate a measuring function for explosion protection? Answer: If a gas detector incorporates a measuring function for explosion protection in the sense of directive 94/9/EC it shall be assessed as safety-related device according to annex II, clause 1.5 EOTC/01/009 also applies. For example, a portable gas detector that is intended to be used to detect the presence of an explosive atmosphere prior to the opening of a flameproof enclosure that contains energised electrical circuits, is being used as a safety-related device.

Annex 8, question 12 of the ATEX-guidelines concludes that: 1. Measuring equipment is within the scope. 2. Measuring equipment has to be safe with respect to explosion protection and the measuring function

also requires assessment. 3. This measuring function can be used for the evaluation of potentially explosive atmospheres or for

control of ignition sources within the equipment itself.

ExNB



94/9/EC (ATEX)

Issued:




EXNB02-113CS EC-type examination and supervision of production for gas detectors incorporat-ing a measuring function for explosion protection.DOC



Original in English







EC-type examination and supervision of production for gas detectors incorporating a measuring function for explosion protection Question: What special technical documentation and measures are necessary for conformity assessment procedures of gas detectors incorporating a measuring function for explosion protection? Answer: A) EC-type examination The technical documentation (according to annex III, clause 3) that shall be submitted for that part of an EC type examination of a gas detector which deals with the measurement performance (measuring function for explosion protection in the sense of directive 94/9/EC, Annex II, paragraph 1.5.5), shall include a complete set of design and manufacturing drawings, a detailed description of the software operation and identification. B) Supervision of the production It is the manufacturer's obligation to ensure that each equipment to be placed on the market is identical with the type tested. To confirm the regular operation of the measuring function of a gas detector the following checks, if applicable, on all relevant parts of each gas detector are necessary 1. input and output functions, e.g. operation of displays, LEDs, alarms and push buttons, 2. sensitivity, 3. software version.

In addition, the manufacturer shall perform the following tests on a sample basis by either performing the tests in accordance with harmonized standards or by other technically equivalent procedures: 4. response time, 5. calibration curve, 6. response to other gases, if applicable, 7. long-term stability, 8. any other check that is considered necessary to confirm the measuring function is in compliance with

the applicable standards (for example, effects of temperature or humidity).

- 2 -

EXNB02-113CS EC-type examination and supervision of production for gas detectors incorporat-ing a measuring function for explosion protection.DOC

Any deviation in the expected results of the checks that are due to design changes, shall be notified to the body that performed the EC type examination. All the above aspects shall be considered by the notified body that performs the audits of the manufacturing facility.

ExNB



94/9/EC (ATEX)

Issued:




EXNB02-114CS Distribution availability and definition of the Relevant information to be communicated to other notified bodies.doc



Original in English

Status: Step*5.2.1 Question Originator M Shearman, Sira Date: 14/06/02






Distribution, availability and definition of the "Relevant information" to be "communicated" to other notified bodies following issue or withdrawal of EC-type Examination Certificates, Production QA Notification Certificates and Product QA Notification Certificates Background information The Standing Committee has requested that notified bodies (NB's) comply with the requirements of the annexes mentioned above. Some NB's circulate lists of certificates issued on a regular basis, other NB's publish the list on a web-site, others sell copies and some wait until a request is made. The Standing Committee would like NB's to agree a common practice to be adopted by all NB's. In addition, although not a requirement of the directive, the Standing Committee has asked if the "relevant information" could be made available to other interested parties. This leads to the following questions and answers: Q1 What is included in the "relevant information" as quoted in Annex III Clause 7, Annex IV, Clause 6

and Annex VII Clause 6? A1 "Relevant information" is the minimum information that enables the validity or status of the certificate

and its amendments to be established. Q2 How will notified bodies communicate this "relevant information" to other notified bodies?

- 2 -

EXNB02-114CS Distribution availability and definition of the Relevant information to be communicated to other notified bodies.doc

A2 Notified Bodies should provide to each other details of their contact point from which the 'relevant information' can be obtained when required. If a Notified Body requires a copy of a certificate from another Notified Body then that Body may make a reasonable charge for providing the certificate.

Q3 Can the "relevant information" be made available to any other interested parties? A3 Yes

ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50019:1977 .


Date of application: Signature: M D Shearman Question: For apparatus with a winding, type of protection “e” (e.g. solenoid, inductive

sensor) that has a rated voltage and will be supplied by an unspecified external power supply, what shall be considered?

Answer: 1) The rated voltage ±10% applies for the assessment of temperature and rated

voltage applies for the assessment of clearance and creepage distances 2) External fault conditions (e.g. higher supply voltages than rated voltage) shall

not be considered Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50020:1977 and EN 50020:1994 - T-class for small coils


Date of application: Signature: M D Shearman Question: How shall temperature classification of small coils be performed? Answer: Temperature rise measurements of small coils (e.g. coils for headphones and

microphones) is made by the resistance method considering fault conditions and dissipation of maximum power (Pi or corresponding power), simulated as follows:

- Modify coil (reduce number of turns) to allow maximum power dissipation at matching coil resistance for the section deemed to get the highest temperature rise.

- For unmodified coils increase applied power proportional with coil resistance to power source resistance ratio or apply the maximum current (li or corresponding current) throught the coil.

- For very small and compact coils (high thermal conductivity between turns

compared with conductivity to ambient) apply matched power to unmodified coil.


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50028:1987 Clause 6.2.1, Rated Voltage and External fault conditions .


Date of application: Signature: M D Shearman Question: For apparatus in type of protection “m” that has a rated voltage, which will be

supplied by an unspecified external power supply, what shall be considered? Answer: 1) The rated voltage +/- 10 % applies to verify that the type of protection is not

affected during the fault conditions according to 4.4 of EN 50028. 2) External fault conditions (e.g. higher supply voltages) shall not be considered


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50014:1977 Clause 22.4.3 and EN 50014:1992 Clause 23.4.3, Guards for Light Transmitting Parts.


Date of application: Signature: M D Shearman Question: When considering the removal of guards prior to impact testing Light Transmitting

Parts, what is considered as a guard? Answer: All obstacles, which prevent the light transmitting part from being hit by the impact

head, shall be considered as a guard, which shall be removed for the impact test. However, if the construction and conditions for use are such that there is obviously no risk of damage and the guard is integral with the enclosure or cannot be removed without losing the practical function of the equipment, such a guard need not be removed.

Note All light transmitting parts shall be understood as light transmitting parts, the

direction that the light travels being irrelevant, as is the presence, or not, of any internal or external, light source (artificial or natural).


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50018:1977 Clause 8 and EN 50018:1994 Clause 9, Glass Windows Directly Fused into the Metallic Housing


Date of application: Signature: M D Shearman Question: Are glass windows in which the glass is fused directly into the metallic housing

accepted as being within the scope of the standard? Answer: Yes


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50019:1977 Trace Heating Tapes.


Date of application: Signature: M D Shearman Question: According to the standard, should the tape construction always include a metallic

braid? Answer: Yes Note Clarification still necessary according to ExNB WG 97/4


ExNB



94/9/EC (ATEX)

Page 1 of 1







Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Subject: EN 50028:1987 Clause 8.1.4 Permitted Prospective Short Circuit Current

Authorised by Chairman: M. Shearman Date: 2004.03.09 Date of application: Signature: M D Shearman Question: When considering the requirements of clause 8.1.4 of EN 50028 in the case where

a piece of equipment is supplied from a dedicated power supply, not itself subject to certification, what should the terms of certification be based upon?

Answer: The terms of certification should be based upon the parameters of the dedicated

power supply


ExNB



94/9/EC (ATEX)

Page 1 of 1




G:\ARCHIV\EG-Sekretariate\Explosionsschutz\Allgemeines\Entzippt\EXNB03-131cs.DOCG:\ARCHIV\EG-

Sekretariate\Explosionsschutz\Stadium 5.2.3\EXNB03-131cs.DOC



Original in English


03


Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Equipment with a measuring function for explosion protection, drop test for remote sensors of fixed apparatus


Date of application: Signature: M D Shearman Question:

In which cases shall the drop test be performed for remote sensors of fixed apparatus?

Answer:

If the remote sensor is intended to be operated as fixed installed device and this fact is clearly

stated in the instruction manual then the drop test shall not be performed. (This is in accordance

with EN 50014 (1997), 23.4.3.2: Drop test is only necessary for devices which are hand held or

carried on the person.)

Remote sensors which may also be used as mobile devices shall be subjected to the drop test.

ExNB



94/9/EC (ATEX)

Page 1 of 2




G:\ARCHIV\EG-Sekretariate\Explosionsschutz\Allgemeines\Entzippt\EXNB03-132cs.DOC



Original in English


03

Step*5.2.3 Initial proposal Proposer: Date: 26/03/03

Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Equipment with a measuring function for explosion protection, High gas concentrations above the measuring range


Date of application: Signature: M D Shearman Question: The sequence of sub-tests 5.4.18.2 and 5.4.18.3 is not defined in EN 50054 (sub-tests 4.4.18.1

and 4.4.18.2 of EN 61779-1, respectively).

The sequence as the sub-tests are written down in the standards (non-ambiguity test first,

residual effect test afterwards) may define a sequence for testing automatically. However, if the

non-ambiguity test is performed first, potential contaminations on the surface of catalytic sensors

will be removed. This would imply that for nearly all catalytic sensors the residual effect test

performed afterwards would have always the result that the requirements of the standard are

fulfilled. Therefore, this sub-test would be useless.

In what sequence shall the sub-tests 5.4.18.2 and 5.4.18.3 of EN 50054 (sub-tests 4.4.18.1 and

4.4.18.2 of EN 61779-1, respectively) be performed? In which cases may an apparatus be

certified although the requirements of EN 50055/50057 or EN 61779-2/-4 for the residual effect

sub-test are not fulfilled?

- 2 -

EXNB03-132cs.DOC

Answer: - The sub-tests shall be performed in the sequence:

1) residual effect test (5.4.18.3 of EN 50054 or 4.4.18.3 of EN 61779-1)

2) non-ambiguity test (5.4.18.2 of EN 50054 or 4.4.18.2 of EN 61779-1) in order to meet

realistic conditions of use.

- If the residual effect test causes an increase in the indications exceeding the tolerances of EN

50055, EN 50057, EN 61779-2 or EN 61779-4 (whatever is the applicable standard) the

apparatus may be certified. The EC-type examination certificate number shall be marked with

“X” and this behaviour shall be stated clearly in the certificate and the instruction manual. The

manual shall further include a clear advise to the user on appropriate measures if such an

event happens during operation of the apparatus. Such advise may be:

- Do not use the apparatus before checking the measuring function with test gases.

- Strictly observe clause 7.2.1 of EN 50073 afterwards.

Note: The text of clause 7.2.1 should be included in the manual.

- If the residual effect test causes a decrease in the indications exceeding the tolerances of EN

50055, EN 50057, EN 61779-2 or EN 61779-4 (whatever is the applicable standard) the

apparatus shall not be certified considered as safety related device.

ExNB



94/9/EC (ATEX)

Page 1 of 2




G:\ARCHIV\EG-Sekretariate\Explosionsschutz\Allgemeines\Entzippt\EXNB03-134cs.DOC



Original in English



Step*5.2.4 Responses/Final Draft Date: *Step refers to ExNB Rules Equipment with a measuring function for explosion protection, examination of catalytic sensors of portable multigas apparatus


Date of application: Signature: M D Shearman Question: Most portable multigas apparatus have a catalytic sensor and sensors for toxic gases. A typical

toxic gas is hydrogen sulphide which often have an adverse effect to the measuring function of

the catalytic sensor. Therefore, the results of the EC-type examination of the catalytic sensor will

depend on whether the H2S-channel is tested in parallel on the same apparatus (e.g. according to

EN 45544-series) or not and what sequence of tests is chosen. On the other hand, the adverse

effect of one of the target gases of the apparatus on the performance of the catalytic sensor has

serious implications on the safe function of the apparatus; the catalytic sensor may be damaged

even when the H2S-sensor is calibrated.

What has to be observed when a type examination of portable multigas apparatus is performed? Answer: - The requirements to the instruction manual (7.2 b, g, q of EN 50054 or 6.2 b, g, p of EN

61779-1, respectively) shall be interpreted in that way that the manual shall include a clear statement on the adverse effect of other measuring gases on the catalytic sensor and appropriate checking and calibration methods.

- In addition, the manual shall include a clear statement that after alarm caused by such a

poisoning measuring gas the catalytic sensor shall be checked. If applicable, the NB shall give

a recommendation to the manufacturer that the apparatus should indicate "Check flammable

- 2 -

EXNB03-134cs.DOC

channel" after such an alarm.

- The EC-type examination shall be made for catalytic sensors without interference of potentially

poisoning measuring gases if it is agreed with the manufacturer that the a.m. statements will

be included in the manual. Otherwise the NB shall verify by appropriate tests (e.g. by type-

testing the catalytic sensor in parallel with the potentially poisoning measuring channel) that

such adverse effects are within an acceptable range.

ExNB

Co-ordination ofNotified Bodies Equipment

for use in potentially explosive atmosphereson Council Directive

94/9/EC (ATEX)

Clarification SheetN° ExNB/07/282/CS


Directive, ESR No.


Standard, No. IEC 60079-5:2007, clause 4.9 and 5.1.5

Page 1 of 3




E:\Daten\ExNB\Unterschriebene CS\2007\ExNB070282 Ex q faults and overloads.DOC

Status: Step*5.2.1 Question Originator Baseefa/CENELEC TC 31

Date: 07-10-25

Step*5.2.3 Initial proposal Proposer: Baseefa/CENELEC TC 31

Date: 07-10-25


*Step refers to ExNB Rules, mentioned in draft only if not approved

Ex q faults and overloads

Authorised by Chairman: Dr. Thedens Date: 2008-10-20

Date of application: 2007-11-28 Signature:

Question: There is an apparent conflict between clauses 4.9 and 5.1.5 regarding the necessityfor testing equipment protected by a fuse, caused partly by using the words “fault”, “overvoltage”,“overcurrent” and “overload” in an arbitrary manner. How is this conflict to be resolved?

Background information not to be included in the final Decision Sheet:There has been a delay in publishing the Cenelec version of the IEC standard which had beensubmitted to the parallel voting procedure. DK and GB had both drawn attention to the anomalyand the European Commission’s CEN/Cenelec consultant had agreed that there was scope forconfusion. He indicated that he would like the matter resolved before recommending the standardfor harmonisation under the ATEX Directive.

At a brief discussion during the Cenelec TC31 meeting in Prague during September, it wasagreed that the European Standard should be published with the identical requirements to theIEC text and that resolution of the conflict should be left to a Decision Sheet from ExTAG and anInterpretation Sheet from ExNB

Answer:

In clause 5.1.5, the term “overload” shall be understood to apply to a situation where the Ex qequipment (or component – such as a solid state relay or a luminaire ballast) controls rather thanconsumes power and the temperature rise is, at least partly, related to the external load. In suchcases, where the equipment is protected by a fuse rated at not more than 170 % of the maximumnormal current, the external load shall be adjusted to achieve the maximum current through thefused circuit, but no more than 1.7 times the fuse rating. Internal faults shall not be applied and

- 2 -

ExNB070282 Ex q faults and overloads.DOC

are not considered to result in an “overload”.

- 3 -

ExNB070282 Ex q faults and overloads.DOC

Annex – Clauses extracted from IEC 60079-5

4.9 Temperature limitations under fault conditions

The enclosure shall not be damaged and the limiting temperature shall not be exceeded even inthe case of faults. The effectiveness of the temperature protection shall be confirmed by the testof 5.1.5.

Unless the equipment supply is protected by a fuse rated at not more than 170 % of themaximum normal current, the equipment shall be subjected to any single internal electrical faultwhich may cause either an overvoltage or overcurrent, for example:

– short-circuit of any component;– open circuit due to any component failure;– fault in the printed circuitry;– etc.

Over-current devices, if employed, shall have a voltage rating not less than that of the circuit andshall have a breaking capacity not less than the prospective fault current of the circuit. If a faultcan lead to one or more subsequent faults, for example overloading of a component, the primaryand subsequent faults are considered to be a single fault.

Where there is no product standard, the overloads to be considered are those specified by themanufacturer.

The voltage UN shall be assumed to be applied to the supply terminals when considering faultconditions and fault exclusions.

When the fuse is not integral to the electrical equipment or parts of electrical equipment, themarking shall include the symbol "X" in accordance with 29.2 i) of IEC 60079-0 and the specificconditions for use shall detail the required fuse.

When the fuse is not integral to an Ex component, the marking shall include the symbol "U" inaccordance with 29.5 g) of IEC 60079-0 and the schedule of limitations shall detail the requiredfuse.

5.1.5 Maximum temperatures

Where fuses are used as protective devices for temperature limitation, the maximum temperatureunder overload conditions shall be measured with a continuous current at least 1,7 times the fuserating.

Where items other than fuses are used as protective devices for temperature limitation, theequipment shall be tested to verify that the limiting temperature is not exceeded when thoseprotective devices operate.

NOTE To simulate overload conditions which may cause higher temperatures than in normal operation, it might be suitable to usepower components mounted in the equipment and subject to the maximum available power. Such components should be chosen andlocated in the equipment so that they are representative of the thermal characteristics of the components they represent.

ExNB



94/9/EC (ATEX)



Directive, ESR No.


Standard, No. IEC 60079-0:2007 (future EN 60079-0), Clauses:26.4.1.2.1 and 26.4.1.2.2

Page 1 of 2




Status: Step*5.2.1 Question Originator Baseefa/UKExNB group

Date: 07-10-25

Step*5.2.3 Initial proposal Proposer: Baseefa/ UKExNB group

Date: 07-10-25



IP Testing of Enclosures with non-metallic parts (gaskets)



Background:

During the drafting of Edition 5.0 of IEC 60079-0, the Maintenance Team took notice of evidencethat some enclosures passed IP testing requirements following thermal endurance andimpact/drop testing, despite the fact that the gasket material had lost all effective elastomericproperties. In such cases, breaking of the gasket seal and refitting of the enclosure wouldnormally have created a failure condition. The maintenance team were concerned that the testwas not specified in a sufficiently rigorous manner to ensure that enclosures would be tested in acondition representative of life in service which would normally include opening and closing of allenclosure joints likely to be disturbed as part of an installation or maintenance procedure.Particular concern was expressed concerning gaskets between the enclosure and separate glandplates.

Question 1:

Are there any circumstances in which IP tests performed in support of conformity to an earlieredition of 60079-0 can be accepted in support of conformity with the latest edition.

Answer 1:

Such tests can only be accepted if the detailed test records clearly show that all joints that areintended to be opened during installation and normal operation were opened and reclosed afterthe environmental test but before the IP test.

- 2 -

ExNB07-283 IP Testing of Enclosures with non-metallic parts gaskets.DOC

Question 2:

Does this additional requirement in the standard represent “an advancement in technologicalknowledge which must be taken into account” in respect of the EHSRs of the ATEX Directive.

Answer 2:

Since the requirement was added in order to avoid identified safety problems, this clearlyrepresents the latest “state of the art” and must be applied as soon as the earlier edition of thestandard ceases to be harmonised.

ExNB



94/9/EC (ATEX)



Directive, ESR No. 2.1


Standard, No. EN 60079-1:2004

Page 1 of 1




Status: Step*5.2.1 Question Originator Baseefa Date: 08-11-13

Step*5.2.3 Initial proposal Proposer: Baseefa Date: 08-11-13

Step*5.2.4 Responses/Final Draft Date: 08-11-28


Instructions and Year of Manufacture



Question: The ATEX Directive requires that all data on the marking plate be replicated in the Instructions,with the exception of the Serial Number. It can therefore be inferred that the Year of Manufacture (whichmust be on the marking plate) should be replicated in the Instructions. However, this can cause problemswhere either the year of manufacture is part of the serial number (or in similar code form) or there is serialproduction spanning more than one year. How can this be resolved in a practical way that also meets theintent of the directive?

Answer: It is assumed that the intent of the directive is to make it transparent to the owner of theequipment when it was manufactured. In this case, it is the information on the marking plate that is critical.Therefore, where it is impractical to have the actual year of manufacture pre-printed in the InstructionDocument (for example with continuous production spanning more than one year), it is appropriate for theInstruction Document to say that the year of manufacture is indicated in the marking of the product and togive advice how any date codes are to interpreted, including when the year forms part of the serial number.In this case, it is also appropriate for the Instructions to state the date on which they were printed and firstcame into force.

Documents

EUROPA - ExNBG Clarification Sheets Noted by the ATEX ... · EC-Type Examination Certificate 30/06/00 03/11/00 01/12/05 00/029 1.0 EN 50014:1977 Clause 7 and EN 50014:1992 clause