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IEC TS 60079-46

Edition 1 .0 201 7-08

TECHNICAL SPECIFICATION

Explosive atmospheres –

Part 46: Equipment assemblies

IEC T

S 60079-4

6:2017-0

8(e

n)

®

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IEC TS 60079-46

Edition 1 .0 201 7-08

TECHNICAL SPECIFICATION

Explosive atmospheres –

Part 46: Equipment assemblies

INTERNATIONAL

ELECTROTECHNICAL

COMMISSION ICS 29.260.20

ISBN 978-2-8322-4763-1

® Registered trademark of the International Electrotechnical Commission

®

Warning! Make sure that you obtained this publication from an authorized distributor.

– 2 – I EC TS 60079-46: 201 7 © I EC 201 7

CONTENTS

FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

I NTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Terms and defi n i ti ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 General requ i remen ts for equ ipment assembl ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4. 1 General speci fications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4. 2 Explos ion protection speci fications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4. 3 Hazardous area cl ass i fication related to the equ ipment assembl y . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4. 3. 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4. 3. 2 Equ ipment assembl y wi th i ts own source of re lease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4. 4 Competencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Design of equ ipment assembl ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. 2 Ex Equ ipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. 2. 1 I nd ividual i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. 2. 2 Speci fic Cond i tions of Use as speci fi ed on certi ficates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5. 2. 3 I tem l i st . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5. 3 Other i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5. 4 Wiring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

5. 5 Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

6 Construction and assembl y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

6. 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

6. 2 Disassembl y and reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

6. 3 System i n terfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

6. 4 I gn i ti on hazard assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

6. 5 Calcu lations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

6. 6 I nspection & testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2

6. 7 Val i dation and documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3

6. 7. 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3

6. 7. 2 Other materia l speci fications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

6. 7. 3 Schedu le Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

6. 8 I nstructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

7 Certi ficate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

8 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

8. 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

8. 2 Determ in ing Group marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5

8. 3 Determ in ing temperature cl ass or maximum surface temperature marking . . . . . . . . . . . . 1 6

8. 4 Determ in ing Equ ipment Protection Level (EPL) marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6

8. 5 Determ in ing ambient temperature range marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6

8. 6 Determ in ing i ngress protection ( I P Code) rati ng . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6


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I EC TS 60079-46: 201 7 © I EC 201 7 – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________

EXPLOSIVE ATMOSPHERES –

Part 46: Equipment assembl ies

FOREWORD

1 ) The I n ternati onal E l ectrotechn i cal Comm iss ion ( I EC) i s a worl dwide organ ization for s tandard ization compri s i ng a l l n ati onal e l ectrotechn ical comm i ttees ( I EC National Comm i ttees). The object of I EC i s to promote i n ternati ona l co-operation on a l l q uesti ons concern i ng s tandard i zati on i n the e l ectri cal and e l ectron ic fi e l ds . To th i s end and i n add i ti on to other acti vi ti es, I EC publ i shes I n ternational S tandards, Techn ical Speci fi cati ons, Techn ical Reports , Publ i cl y Avai l abl e Speci fi cati ons (PAS) and Gu ides (hereafter referred to as “ I EC Publ i cati on (s )” ). Thei r preparation i s en trusted to techn ical comm i ttees; any I EC National Comm i ttee i n terested i n the subj ect deal t wi th may parti ci pate i n th i s preparatory work. I n ternational , governmental and non -governmental organ izations l i a i s i ng wi th the I EC a l so parti ci pate i n th i s preparation . I EC col l aborates cl osel y wi th the I n ternati onal Organ i zation for S tandard ization ( I SO) i n accordance wi th cond i t i ons determ ined by agreement between the two organ i zati ons.

2) The formal deci s ions or ag reements of I EC on techn ical matters express, as nearl y as possib le, an i n ternati ona l consensus of opi n ion on the rel evant sub jects s i nce each techn ical comm i ttee has represen tati on from a l l i n terested I EC National Comm ittees.

3) I EC Publ i cati ons have the form of recommendations for i n ternational use and are accepted by I EC National Comm i ttees i n that sense. Whi l e a l l reasonable efforts are made to ensure that the techn ical conten t of I EC Publ i cati ons i s accu rate, I EC cannot be hel d responsi ble for the way i n wh ich they are used or for any m is i n terpretati on by any end u ser.

4) I n order to promote i n ternational u n i form i ty, I EC National Comm i ttees undertake to app ly I EC Pub l i cati ons transparentl y to the maximum extent poss ible i n the i r nati onal and reg i onal publ i cati ons. Any d i vergence between any I EC Pub l i cati on and the correspond i ng nati onal or reg i onal publ i cati on shal l be cl earl y i n d i cated i n the l atter.

5) I EC i tsel f d oes not provi de any attestati on of conform i ty. I n dependent certi fi cati on bod ies provi de conform i ty assessment services and , i n some areas, access to I EC marks of conform i ty. I EC i s not responsi b le for any services carri ed ou t by i ndependent certi fi cati on bod i es .

6) Al l u sers shou ld ensure that they have the l atest ed i ti on of th i s publ i cati on .

7) No l i abi l i ty shal l attach to I EC or i ts d i rectors, employees, servants or agen ts i ncl u d ing i n d i vi dual experts and members of i ts techn ical comm i ttees and I EC Nati onal Comm i ttees for any personal i n j u ry, property d amage or other damage of any natu re whatsoever, whether d i rect or i nd i rect, or for costs ( i ncl ud i ng l egal fees) and expenses ari s i ng ou t of the publ i cati on , u se of, or re l i ance upon , th i s I EC Publ i cati on or any other I EC Publ i cati ons .

8) Atten ti on i s d rawn to the Normati ve references ci ted i n th i s publ i cati on . Use of the referenced publ i cati ons i s i nd i spensable for the correct appl i cati on of th i s publ i cati on .

9) Atten ti on i s d rawn to the poss ib i l i ty that some of the e l ements of th i s I EC Publ i cati on may be the subject of paten t ri gh ts . I EC shal l not be hel d respons ibl e for i denti fyi ng any or a l l such paten t ri gh ts .

The main task of I EC techn ical committees i s to prepare I n ternational Standards. I n exceptional ci rcumstances, a techn ical committee may propose the publ i cation of a techn ica l

speci fication when

• the requ ired support cannot be obta ined for the publ ication of an I n ternational Standard ,

despi te repeated efforts, or

• the subj ect i s sti l l u nder techn ical developmen t or where, for any other reason , there is the

fu ture bu t no immed iate poss ib i l i ty of an agreement on an I n ternational Standard .

Techn ical speci fications are subj ect to review wi th i n th ree years of publ ication to decide

whether they can be transformed in to I n ternational Standards.

I EC TS 60079-46, wh ich i s a techn ical speci fication , has been prepared by I EC techn ica l

committee TC 31 : Equ ipment for explos ive atmospheres.

– 4 – I EC TS 60079-46: 201 7 © I EC 201 7

The text of th is techn ical speci fication i s based on the fol l owing documents:

Enqu i ry d raft Report on voti ng

31 /1 31 2/DTS 31 /1 327/RVDTS

Fu l l i n formation on the voti ng for the approval of th is techn ica l speci fication can be found i n

the report on voti ng i nd icated i n the above table.

Th is document has been d rafted i n accordance wi th the I SO/IEC D irecti ves, Part 2 .

A l i s t of a l l parts in the I EC 60079 series, publ ished under the genera l t i t l e Explosive

atmospheres , can be found on the I EC websi te .

The comm ittee has decided that the con ten ts of th is publ ication wi l l remain unchanged unti l the stabi l i ty date i nd icated on the I EC websi te under "h ttp: //webstore. i ec. ch " i n the data

re lated to the speci fic publ ication . At th is date, the publ ication wi l l be

• transformed in to an I n ternational s tandard ,

• reconfi rmed ,

• wi thdrawn ,

• replaced by a revised ed i ti on , or

• amended .

A b i l i ngual vers ion of th is publ ication may be i ssued at a l ater date.



I EC TS 60079-46: 201 7 © I EC 201 7 – 5 –

INTRODUCTION

The provis ion of products i n to end markets for i nsta l l ation by end users may take the form of

e i ther i nd ivi dual i tems of equ ipment or pre-manufactured assembl ies compris ing many i tems of equ ipment. Pre-manufactured equ ipment assembl ies may be as e i ther subsystems

requ iring i n tegration as part of an i nsta l lation at a s i te or complete functional mach ines wh ich

requ ire l i ttle or no add i tional reassembl y on s i te .

Th is document i s appl i ed when assembl y of Ex Equ ipment(s) resu l ts i n an assembl y that

creates a need for add i tional assessment that i s not a l ready complete ly covered by the

i nd ivi dual equ ipment certi ficates. Add i tional assessment m ight i ncl ude (bu t i s not l im i ted to) eva luation of wi ri ng methods used to connect the equ ipment(s) or temperature ri se wi th i n the

assembl y.

Th is document provides requ i rements for the des ign , construction , assembl y, testi ng ,

i nspection , marking , documenting and assessment of equ ipment assembl ies such that the

i tems of Ex Equ ipment and the i n terconnection of the i tems of equ ipment form an assembl y

that a lso meets other parts of the I SO 80079 and I EC 60079 series.

Th is document i s i n tended to be used for veri fi cation of assembl ies to ass ist i n ensuring products are i n compl iance wi th the requ irements of the I SO 80079 and I EC 60079 series at

the time of i n i ti a l i nsta l l ati on at the end user s i te .

After the i n i tia l i nsta l lati on , the assembl y i s cons idered as part of the s i te i nsta l lation i n

accordance wi th other parts of the I SO 80079 and I EC 60079 series.

– 6 – I EC TS 60079-46: 201 7 © I EC 201 7

EXPLOSIVE ATMOSPHERES –

Part 46: Equipment assembl ies

1 Scope

This part of I EC 60079, wh ich i s a techn ical speci fication , speci fi es requ i remen ts for the design , construction , assembl y, testi ng , i nspection , marking , documen ting and assessment of

equ ipment assembl ies for use i n explos ive atmospheres under the respons ib i l i ty of the

manufacturer of the equ ipment assembl y.

The requ iremen ts of th i s document appl y to ind ivi dual i tems accord ing to the I EC 60079

series or I SO 80079 series that comprise the assembly and that have i nd ivi dual certi ficates . These ind ividual i tems are then i n tegrated as part of the equ ipment assembly. Also i ncluded

are requ i remen ts to address aspects for the assembly wh ich may be beyond the certi ficates of

the i nd ivi dual i tems form ing the assembl y.

The scope of th is document i ncl udes assessment of the add i tiona l requ irements for

assembl ies for hazardous areas and does not i ncl ude requ irements for non -hazardous areas.

I t i s assumed that compl iance wi th other e l ectrical or mechan ica l requ i rements that are appl icable for non-hazardous areas wi l l be veri fi ed by e i ther the same or d i fferen t party i n

add i ti on to the requ i rements of th is document.

Th is documen t does not appl y to:

– equ ipment wh ich i s covered , i n i ts en ti rety, by one or more I EC 60079 and I SO 80079

equ ipment types of protection ;

– pressuri zed rooms, “p” , i n accordance wi th I EC 60079-1 3, arti ficia l ven ti l ati on for the

protection of ana l yzer(s) houses i n accordance wi th I EC TR 60079-1 6, and other

standards address ing speci fic Ex assembl ies ;

– i nsta l l ation at the end-user s i te under the scope of I EC 60079-1 4 ;

– cl assi fication of the hazardous area;

– equ ipment assembl ies for m ines susceptib le to fi redamp (Group I appl ications) ;

– i nheren tl y explos ive s i tuations and dust from explos ives or pyrophoric substances (for

example explos ives manufacturi ng and process ing) ;

– rooms used for med ical purposes;

– e lectrica l i nsta l l ati ons i n areas where the hazard i s due to fl ammable m ist.

The speci fication i s on l y i n tended to provide val i dation for the i n i ti a l suppl y of an assembl y.

NOTE 1 Add i ti onal g u i dance on the requ i rements for hazards due to h ybri d m ixtu res of dust or fl yi ngs and fl ammable gas or vapour i s provided i n I EC 60079-1 4.

Where a requ i rement of th is document confl icts wi th a requ iremen t of e i ther I EC 60079-0 or

I SO 80079-36, the requ i rement of th is documen t takes precedence.

NOTE 2 For th i s fi rst ed i ti on , the on l y requ i rements of th i s document that take precedence over I EC 60079-0 or I SO 80079-36 are the markings for equ ipment assembl i es .



I EC TS 60079-46: 201 7 © I EC 201 7 – 7 –

2 Normative references

The fol l owing documents are referred to i n the text in such a way that some or a l l of thei r

con ten t consti tu tes requ irements of th is document. For dated references, on l y the ed i tion

ci ted appl i es. For undated references, the l a test ed i tion of the referenced documen t ( i ncl ud ing

any amendments) appl i es.

I EC 60079 (a l l parts) , Explosive atmospheres

I EC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements

I EC 60079-1 0-1 , Explosive atmospheres – Part 1 0-1 : Classification of areas – Explosive gas

atmospheres

I EC 60079-1 0-2 , Explosive atmospheres – Part 1 0-2: Classification of areas – Explosive dust

atmospheres

I EC 60079-1 4, Explosive atmospheres – Part 1 4: Electrical installations design, selection and

erection

I EC 60079-25, Explosive atmospheres – Part 25: Intrinsically safe electrical systems

ISO 80079 (a l l parts), Explosive atmospheres

ISO/IEC 80079-34, Explosive atmospheres – Part 34: A pplication of quality systems for

equipment manufacture

ISO 80079-36, Explosive atmospheres – Part 36: Non-electrical equipment for explosive

atmospheres – Basic method and requirements

3 Terms and defin i tions

For the pu rposes of th is document, the terms and defin i tions g i ven i n I EC 60079-0,

I EC 60079-1 4 , I SO 80079-36 and the fo l l owing appl y.

I SO and I EC main ta in term inolog ica l databases for use i n standard ization at the fo l l owing

addresses:

• I EC E lectroped ia: avai lable at h ttp: //www.electroped ia.org /

• I SO On l ine browsing p latform : avai l able at h ttp: //www. iso. org/obp

3. 1 equ ipment assembly

pre-manufactured combination of Ex Equ ipment, together wi th other parts as necessary, that

are e lectrical l y or mechan ica l l y i n terconnected that are pre-assembled prior to being p laced

i n to service at the end-user s i te, and that can be d isassembled and then re-assembled at the

end-user s i te

3.2 equ ipment assembly certi fi cate

document that conveys the assurance of the conform i ty of an equ ipment assembl y wi th

speci fied requ i rements

Note 1 to en try: The certi fi cate i s e i ther the suppl i er’ s declarati on of conform i ty or the pu rchaser’ s recogn i ti on of conform i ty or certi fi cati on (as a resu l t of acti on by a th i rd party) as defi ned i n I SO/I EC 1 7000 : 2004, defi n i ti on 2 .

http://www.electropedia.org/http://www.iso.org/obp

– 8 – I EC TS 60079-46: 201 7 © I EC 201 7

3.3

pre-manufactured

equ ipment assembl y produced at any l ocation(s) other than the end-user s i te

4 General requirements for equipment assembl ies

4. 1 General specifications

The equ ipment assembly shal l be veri fi ed for su i tabi l i ty against the requ irements of th is

documen t, I EC 60079-0, I EC 60079-1 4 and I SO 80079-36 as appl icable .

The general speci fications may be provided by the end-user or by the manufacturer for the

i n tended use of the equ ipment assembl y and shal l cover the fo l l owing as a m in imum :

– manufacturer’s un ique equ ipment assembl y i den ti fi er (e . g . seria l number) ;

– i npu t and ou tput ratings ;

– i n tended envi ronmental cond i ti ons , i ncl ud ing ambient temperature range and i ngress

protection ;

– appl icable explos ion protection codes, standards and regu lations ;

– u ti l i ty-re lated i ssues, i ncl ud ing power suppl y;

– any requ irements for i tems to be used i n the equ ipment assembl y;

– process cond i tions, i nclud ing fl u i ds, pressures, d u ty;

– external sources of heati ng and cool i ng ;

– external i n terface parameters (e . g . for i n tri ns ic safety, controls , shu tdowns and i n terlocks,

i ncl ud ing detai l s regard ing fa i l u re modes) .

These genera l speci fications re lated to the appl i cation of the equ ipment assembl y shal l be

documented by the manufacturer.

4.2 Explosion protection specifications

I n add i ti on to the general speci fications of 4 . 1 , i f not speci fi ed as part of them , the manufacturer shal l document the fo l l owing speci fications re lated to the i nsta l l ati on of the

equ ipment assembl y by the end-user:

– defau l t equ ipment protection l evel (EPL) as defined i n I EC 60079-1 4, as a m in imum

requ i rement;

– equ ipment Group;

– temperature cl ass i fication or maximum surface temperature;

– a l l owances for dust l ayers as appl icable ;

– Speci fic Cond i tions of Use (“X” cond i ti ons).

4.3 Hazardous area classification related to the equ ipment assembly

4.3. 1 General

There are two aspects of area class i fication that can impact equ ipmen t assembl ies. The fi rst

i s due to the area i n wh ich the equ ipment assembl y i s to be i nsta l led , and the second is d ue

to any source of release from the equ ipment assembly.

I t i s not a requ irement of th is document to veri fy e i ther of these area class i fi cations.

The manufacturer sha l l document the su i tabi l i ty of the equ ipmen t assembl y for the i n tended

end-s i te hazardous area cl assi fication and for the defined i nsta l lation cond i ti ons.



I EC TS 60079-46: 201 7 © I EC 201 7 – 9 –

4.3.2 Equ ipment assembly wi th i ts own source of release

I f the equ ipment assembly has i ts own source of re lease, the manufacturer shal l a l so

documen t:

– the hazardous area classi fication i den ti fyi ng any source of re lease, factors relevant to the

sources of release (e. g . re lease rate , ori fice s i ze, operating mode, fai l u re mode,

recommendation for management of the hazard ) and any other i n formation re levant to quanti fyi ng the hazard and the methodology and any references used to arrive at the

classi fication ;

– any cond i ti ons defined by the manufacturer such that the su i tabi l i ty of the equ ipment

assembl y for the hazardous area class i fication remains val i d .

The cl assi fication of hazardous areas shal l be i n accordance wi th I EC 60079-1 0-1 or

I EC 60079-1 0-2 as appl icable. Th is class i fication may be provided by the end-user.

4.4 Competencies

For equ ipment assembl ies subjected to type veri fication , the manufacturi ng process and the

competency of the re lated personnel sha l l conform to I SO/I EC 80079-34.

For equ ipment assembl ies subjected to un i t veri fication , competency of the personnel

perform ing the production processes i s veri fied by conform i ty of the equ ipment assembly wi th

th is document. The veri fying party shal l be competent i n the explos ion protection aspects of

the assembl y be ing veri fi ed .

When equ ipment assembl ies are subjected to un i t veri fication , the veri fyi ng party shal l have

evidence of competency through an i ndependent party or system .

Documentation regard ing the above shal l be i ncluded wi th each equ ipment assembly.

NOTE An example of su i tabl e documentati on to demonstrate the competency requ i red for type veri fi cati on wou ld be a record of current assessment to I SO/I EC 80079-34 by a competent th i rd -party assessor, and for un i t veri fi cati on i t cou l d be a cu rren t certi fi cate i ssued by a competent th i rd -party assessor.

5 Design of equipment assembl ies

5. 1 General

The se lection , i nsta l l ation and inspection of the e lectrical equ ipment i n an assembly sha l l be

i n accordance wi th I EC 60079-1 4, except as mod i fi ed by th is document.

5.2 Ex Equ ipment

5. 2. 1 Ind ividual i tems

I nd ividual i tems that comprise the equ ipmen t assembly sha l l conform to the I EC 60079 series or I SO 80079 series s tandards based on the associated ign i ti on ri sks, and sha l l have

i nd ivi dual Ex Equ ipment certi ficates or be assessed as part of the assembly.

Al l i nd ivi dual i tems shal l be su i tabl y rated for the appl ication and be u ti l i zed i n accordance

wi th the manufacturer’s i nstructions.

Where i tems other than su i tabl y rated Ex Equ ipmen t were not separatel y assessed as part of Ex Equ ipmen t, an assessment, i nclud ing further tests accord ing I EC 60079 series or

I SO 80079 series standards i f necessary, sha l l be made as part of the equ ipment assembl y

eva luation .

NOTE I tems other than Ex Equ ipment can i ncl ude, for example, Ex Components , s imple apparatus , general i ndustri a l products wi th i n an Ex “d ” or Ex “p” enclosu re, G roup I equ i pment used i n a Group I I appl i cati on .

– 1 0 – I EC TS 60079-46: 201 7 © I EC 201 7

5.2.2 Specific Condi tions of Use as specified on certi fi cates

Al l Speci fic Cond i ti ons of Use as speci fied on equ ipment certi ficates sha l l be cons idered and

the i r appl ication documented by the manufacturer as fo l lows:

– I f d i rectl y re lated to the equ ipment assembl y, how they were satisfied i n the equ ipmen t

assembl y.

– I f d i rectl y re lated to the equ ipmen t assembl y, bu t not satisfied i n the equ ipment assembl y,

how they wi l l be able to be satisfied i n the end-user s i te i nsta l l ati on .

– I f not d i rectl y re lated to the equ ipment assembl y, why they were not d i rectl y re lated .

Speci fic Cond i ti ons of Use that are related to i tems of equ ipment form ing the equ ipment

assembl y, that are not satisfied in the equ ipment assembl y, bu t able to be satisfi ed i n the end-user s i te i nsta l lation , shal l be i ncluded or addressed , on the equ ipment assembl y

certi ficate.

5.2.3 I tem l i st

An i tem l i s t sha l l be prepared by the manufacturer of the equ ipment assembl y and i ncluded as

part of each equ ipment assembl y certi ficate.

Th is l i st shal l i ncl ude an i nven tory of a l l Ex Equ ipment, i ncl ud ing Ex Componen ts that were

assessed as part of th is equ ipment assembl y, i ncorporated i n to the equ ipment assembly.

Regard ing each i tem on th is l i st, deta i l s shal l be provided that i nd icate the:

– description ( type of device) ;

– manufacturer's name and model or part number ( type des ignation) ;

– i denti fication number of each i tem (e. g . tag number) ;

– Ex Equ ipment certi ficate number, i nclud ing i ssue number;

– Ex Component certi ficate number, i ncl ud ing i ssue number, for Ex Components that were assessed as part of th is equ ipment assembl y;

– type of protection , Group and temperature class i fication (wh ich may be provided as the

complete Ex marking stri ng) ;

– ambien t temperature range;

– i ngress protection ( I P Code), i f appl icable.

5.3 Other i tems

Regard ing other i tems that may be re levant to explos ion protection for the equ ipment

assembl y (e . g . non-meta l l i c parts such as housings, hand les, cable trays, ro l l ers , fl u i d tubing) ,

detai ls sha l l be provided that ind icate the:

– description ( type of device);

– manufacturer's name and model or part number ( type des ignation) ;

– description of any explos ion risk i nvolved and how the risks are m i tigated .

NOTE I SO 80079-36 provides gu i dance regard i ng i gn i ti on ri sk assessments appl i cable to both non-e lectri cal and e l ectri cal i gn i ti on ri sks .

5.4 Wiring system

Design of the wiri ng system for the equ ipment assembl y that i n terconnects the Ex Equ ipment

sha l l i ncorporate wiring methods that conform to I EC 60079-1 4 .

I n formation sha l l be provided by the manufacturer for each wi ring method , i nclud ing

term ination means, used as part of each equ ipment assembly.



I EC TS 60079-46: 201 7 © I EC 201 7 – 1 1 –

Regard ing th is i n formation , deta i l s shal l be provided that i nd icate the:

– type of cable or condu i t construction des ignation (e. g . tray cable, marine cable, ri g id metal

condu i t, fl exible condu i t) ;

– number and s ize of conductor cores, i f appl icable;

– temperature ratings, i f appl icable;

– e lectrical parameters (such as i nductance and capaci tance per meter, i nductance to

res istance ratio) for in trinsical l y safe systems;

– envi ronmenta l compatib i l i ty i n accordance wi th 4 . 1 (such as ou tdoor use, moisture, flexibi l i ty, vi bration , chem ical compatib i l i ty) ;

– veri fication that en try devices and fi tti ngs (e . g . cable g l ands, condu i t seal i ng devices,

condu i t e lbows) are appropriate for the Type of Protection of the i n terconnected i tem of Ex Equ ipment.

I t i s not a requ i rement of th is document that the conform i ty of the cable speci fications be

veri fied by testi ng , except as requ ired by I EC 60079-1 4.

5.5 Drawings

Drawings shal l be provided by the manufacturer to cover a l l re l evan t i n formation for the assembl y i ncl ud ing deta i l s found in other I SO 80079 and I EC 60079 series standards. Th is

i n formation may i nclude, as appl icable:

– l ayouts ;

– mechan ica l deta i l s ;

– s i ng le l i ne d iagrams;

– i n terconnection d iagrams i ncl ud ing wire and core des ignations;

– cable and condu i t deta i ls ;

– for in trins ical l y safe wi ri ng systems a “systems descripti ve documen t” as defined i n

I EC 60079-25 and I EC 60079-1 4.

6 Construction and assembly

6. 1 General

The manufacturer sha l l provide mechan ical l ayou t d rawings of the equ ipment assembl y.

6.2 Disassembly and reassembly

The fol l owing i s perm i tted to be performed by the manufacturer of the equ ipment assembl y,

as l ong as i t i s documented in the equ ipment assembly assessmen t records :

– d isassembl y i n the factory of a completed equ ipment assembly;

– transportation of the d isassembled equ ipment assembly to the end-user s i te, and ;

– reassembl y of the equ ipment assembl y at the end-user s i te.

Al ternativel y, the reassembly acti vi ty i s perm i tted to be performed under the responsib i l i ty of

the manufacturer, as l ong as th is i s documented i n the equ ipment assembl y assessmen t

records.

NOTE Local regu lati ons m ight consider the reassembly of an equ i pment assembly i n the fi e l d at the end -s i te as an i nsta l l ati on acti vi ty, and therefore reassembly cou l d be subject to l ocal i nstal l ati on regu lati ons.

– 1 2 – I EC TS 60079-46: 201 7 © I EC 201 7

6.3 System interfaces

The need for system i n terfaces re lated to the explos ion protection sha l l be addressed by the

manufacturer as part of the equ ipment assembl y documentation . See 4 . 1 .

When these i n terfaces are i n tegral to the equ ipment assembl y, they are addressed as

i nd icated i n th is document.

When these i n terfaces are to be l ocated remotel y from the equ ipment assembl y, the

manufacturer shal l i nclude i nstructions as to the necessary characteristics of these i n terfaces.

6.4 Ign i tion hazard assessment

The manufacturer sha l l perform and document an assessment of a l l i gn i tion hazards that

m ight have been caused by the combination of the Ex Equ ipment i n accordance wi th

ISO 80079-36 for both non-electrical and el ectrical ri sks. Add i tional l y, a risk assessment

methodology speci fi ed by the end -user may a lso be performed .

The documentation shal l address the risks as fo l l ows:

– i gn i tion hazards d i rectl y re lated to the equ ipment assembly, and how they were m i tigated

i n the equ ipmen t assembl y;

– i gn i ti on hazards d i rectl y re lated to the equ ipment assembl y, not m i tigated i n the equ ipment

assembl y, bu t able to be m i ti gated i n the end-user s i te i nsta l l ati on .

For i gn i ti on hazards that are not m i ti gated in the equ ipmen t assembl y, bu t that are able to be

m i ti gated i n the end-user s i te insta l l ati on , the equipment assembly certificate number shall include the "X" suffix in accordance with the marking requirements of IEC 60079-0 and the Specific Conditions

of Use shall be l isted on the certificate and in the instructions.

I gn i ti on hazards for each i tem of Ex Equ ipment are addressed by the Ex Equ ipment

certi ficates , and therefore need not be reassessed .

The veri fier sha l l confi rm that the manufacturer has carried ou t an i gn i ti on hazard assessment

and documented con trol measures and any res idual ri sk.

6.5 Calcu lations

The manufacturer shal l provide a l l ca lcu lations and safety parameters (such as tri p setti ngs on a motor overload , explosion re l ief ca lcu lations, etc. ) re levan t to the explos ion protection of

equ ipment assembly i n accordance wi th I EC 60079-1 4, and the appl icable Type of Protection

standards i f not addressed by I EC 60079-1 4.

Ca lcu lations re levant to the explosion protection of equ ipmen t assembl ies may i ncl ude

maximum power d iss ipation for i ncreased safety “e” enclosures, cable rati ng wi th the setti ngs of the overload protecting ci rcu i t breakers and i n tri nsica l l y safe l oop anal ysis (a lso referred to

as descripti ve system documents or con trol d rawings) .

NOTE I t i s not a requ i rement of th i s document that the ca l cu lati ons for remotely l ocated i tems be veri fi ed .

6.6 Inspection & testing

I nspection and testing of the en ti re equ ipment assembl y after assembly shal l be performed

and documented by the manufacturer.

The e lectrical aspects of the assembl y shal l be i nspected and tested i n accordance wi th

I EC 60079-1 4 , wi th the non-electrica l aspects addressed i n accordance wi th the ign i ti on

hazard assessment in 6 . 4.



I EC TS 60079-46: 201 7 © I EC 201 7 – 1 3 –

When d isassembly and reassembl y i s i nvolved , the equ ipment assembl y sha l l be subj ected to

an i nspection and testing and documen ted e i ther en ti re l y after reassembl y, or parti a l l y prior to

d isassembl y and parti a l after reassembl y.

6.7 Val idation and documentation

6.7. 1 General

Veri fication of an equ ipmen t assembl y’ s conform i ty to the des ign d rawings and speci fications

shal l i nclude:

– confi rmation that a l l Ex Equ ipment on the assembly i s i den ti fied i n the documentation and that the documen tation matches the assembl y;

– veri fication of the con ten t of the i tem l i s t (see 5 . 2 . 3)

Assessment of the assembly shal l i nclude:

– confi rmation that each Ex Equ ipment, i ncl ud ing Ex Components that were assessed as

part of th is equ ipment, i s appropriate for the appl ication (e. g . rati ngs match operati ng

cond i ti ons);

– confi rmation that Speci fi c Cond i ti ons of Use for Ex Equ ipmen t are e i ther addressed in the

assembl y or passed on to the end-user;

– confi rmation that the Schedu le of L im i tations for Ex Componen ts that were assessed as part of th is equ ipment assembl y are e i ther addressed i n the assembl y or passed on to the

end-user, i ncl ud ing detai l s regard ing the assessment;

– i nspection of the assembl y i s completed i n accordance wi th 6 . 6 , and that

non-conformances are corrected ;

– i nspection of the assembly to ensure that i t can be i nsta l led i n accordance wi th

I EC 60079-1 4 ( incl ud ing any l ocal i nsta l lati on cri teria) ;

– review of the i nstructions for each p iece of Ex Equ ipment to confi rm proper appl ication of

the Ex Equ ipment.

The fi na l documentation package for an equ ipmen t assembl y sha l l i ncl ude the fo l lowing :

- genera l speci fications re lated to the appl ication of the equ ipment assembl y (see 4. 1 ) ;

- explos ion protection speci fications re l ated to the i nsta l lation of the equ ipment assembl y by

the end-user (see 4 . 2) ;

- su i tab i l i ty of the equ ipment assembl y for the end-s i te hazardous area cl ass i fication and for

the i nsta l lation cond i tions defi ned by the end -user (see 4. 3. 1 ) ;

- detai l s regard ing any sources of re lease (see 4. 3. 2) ;

- competencies associated wi th the re lated manu facturi ng process personnel or veri fyi ng

party as appl icable (see 4. 4);

– detai ls regard ing i tems re levant to the explos ion protection of the equ ipment assembl y as

fol l ows:

• acti ons regard ing a l l Speci fic Cond i ti ons of Use as speci fi ed on equ ipmen t (5. 2. 2)

• i tem l i st of a l l Ex Equ ipmen t (see 5. 2 . 3)

• detai ls regard ing other i tems that may be re levant to the explosion protection of the equ ipment assembl y (see 5. 3) ;

– i n formation regard ing each wi ri ng method , i ncl ud ing term ination means, used as part of

the equ ipment assembl y (see 5. 4) ;

– d rawings of the equ ipment assembl y (see 5 . 5);

– mechan ical l ayou t d rawings of the equ ipment assembly (see 6 . 1 ) ;

– any provisions for earth ing and bond ing of the equ ipment assembly as requ ired for

end-user s i te i nsta l l ati on ;

– 1 4 – I EC TS 60079-46: 201 7 © I EC 201 7

– detai ls regard ing d isassembl y and reassembly at the end-user s i te of the equ ipment

assembl y, e i ther d i rectl y by the manufacturer of the equ ipment assembly or under the responsib i l i ty of the manufacturer, i f appl icable (see 6. 2);

– the need for system in terfaces re lated to the explos ion protection , e i ther i n tegral to the

equ ipment assembl y or l ocated remotel y, i f appl icable (see 6. 3) ;

– any residual ri sk i den ti fi ed by the ign i ti on hazard assessment (see 6 . 4);

– a l l ca lcu lations and safety parameters re levant to the explos ion protection of equ ipmen t

assembl y (see 6. 5) ;

– resu l ts of the i nspection and testing (see 6 . 6) ;

– other materia l speci fications (see 6 . 7. 2) ;

– i nstructions for each p iece of Ex Equ ipment;

– i nstructions for the equ ipment assembl y (see 6. 8) ;

– access to equ ipment;

– environmenta l controls;

– a l l owances for fi e ld cabl i ng ;

– I ngress Protection assessment resu l ts .

6.7.2 Other material speci fications

Materia ls used other than materia ls that are part of an i tem of Ex Equ ipment, i ncl ud ing Ex

Components that were assessed as part of th is equ ipmen t assembl y, and that are re lated to the explosion protection of the equ ipment assembl y, shal l be veri fi ed for compl iance wi th the

appl icable requ i rements of I EC 60079-0 and I SO 80079-36.

6.7.3 Schedule Documents

Documents sufficient to define the equ ipment assembl y shal l be referenced on the equ ipment

assembl y certi ficate (e. g . genera l assembl y d rawing that i den ti fi es the Ex Equ ipment used) .

6.8 Instructions

I n add i ti on to the requ i rements i n I EC 60079-0, I EC 60079-1 4 and I SO 80079-36, the

manufacturer of the equ ipment assembl y shal l prepare i nstructions that address the fol l owing ,

as appl icable:

– speci fic cond i tions of use that are not satisfied i n the equ ipment assembl y, bu t that are

ab le to be satisfi ed i n the end-user s i te i nsta l l ati on ;

– characteristics of i n terfaces that are re lated to the explos ion protection and that are to be

l ocated remotel y from the equ ipment assembl y;

– any i den ti fied ri sks that are not m i ti gated i n the equ ipment assembl y, and that are able to

be satisfied i n the end -user s i te insta l l ati on ;

– user-speci fi ed des ign requ irements;

– a l l requ i red markings of the assembl y and l ocations of these markings ;

– explos ion protection speci fications re lated to the i nsta l lation of the equ ipment assembl y by

the end-user (see 4 . 2) .

7 Certi ficate

I n add i tion to the requ i rements i n I EC 60079-0 and I SO 80079-36, the certi ficate for the

equ ipment assembl y sha l l address the fo l l owing , as appl icable:

– assembl y at the factory by the manufacturer of the equ ipment assembl y;

– assembl y at the end-s i te d i rectl y by the manufacturer or under the respons ib i l i ty of the

manufacturer of the equ ipment assembly;



I EC TS 60079-46: 201 7 © I EC 201 7 – 1 5 –

– d isassembl y of an equ ipment assembl y at the factory and reassembl y at the end-si te

d i rectl y by the manufactu rer or under the respons ib i l i ty of the manufacturer;

– where the assembl y has an i n ternal source of re lease, the certi ficate shal l s tate that the

cl assi fication for the i n ternal source of release has not been veri fied by the assessor, i f

such is the case;

– the speci fic cl auses of I EC 60079-1 4 that have been satisfi ed ;

– the l evel of i nspection completed on the equ ipment assembly;

– where i tems other than Ex equ ipmen t were i ncl uded as part of the assembl y, the

certi ficate shal l l i s t each such i tem and i nd icate the appl icable marking on each i tem .

8 Marking

8. 1 General

The equ ipment assembl y shal l be marked i n accordance wi th I EC 60079-0 and I SO 80079-36, except for the symbol for each type (or l evel ) of protection used , wh ich is replaced by

‘60079-46 ’ . As the types of protection are not i ncluded on the marking , the equ ipmen t

protection l evel (EPL) for the complete equ ipment assembl y shal l be marked .

The manufacturer’s name that appears on the assembl y marking shal l be that of the

equ ipment assembler.

The Equ ipmen t Group, temperature cl ass i fication (or maximum surface temperature) , equ ipment protection l evel (EPL), and ambient temperature range, a long wi th optional i ngress

protection ( I P Code) markings for the equ ipment assembl y shal l be determ ined as deta i led

below. Separate determ ination of th is marking con ten t i s needed for explos ive gas

atmospheres and explos ive dust atmospheres, as appl icable.

The equ ipment assembl y markings are not i n tended to s impl y be a repeat of markings from the incorporated Ex Equ ipment, i nclud ing Ex Components that were assessed as part of th is

equ ipment assembl y. The markings for the equ ipmen t assembly are to be determ ined

speci fica l l y for the equ ipment assembl y based on the requ irements of th is documen t.

I tems wh ich requ ired add i tional assessment as a part of the assembl y sha l l have an external

marking , i nclud ing Type of Protection and reference to the assembl y certi fi cate number.

The certi ficate shal l i nclude a Speci fic Cond i tion of Use that the i nsta l lati on i s requ i red to be

i n accordance wi th the i nstruction documents .

I f an assembl y has parts that have d i fferent cl assi fications or EPLs, the markings and

i nstructions shal l i den ti fy these.

8.2 Determin ing Group marking

The Equ ipmen t Group markings for the equ ipment assembl y shal l be based on the fol l owing :

– the l owest (e . g . I I B i s lower than I I C) Group marking of a l l of the Ex Equ ipment, i ncl ud ing

Ex Componen ts that were assessed as part of th is equ ipment assembl y, for the i nvolved

explos ive atmospheres, as appl icable:

– other attribu tes of the equ ipment assembl y construction that may affect the Equ ipmen t

Group marking (e. g . materia l composi tion of external surfaces) .

NOTE I t i s possible to have d i fferent area cl ass i fi cati ons appl i cable to the same equ ipment assembly, such as due to an i n ternal source of rel ease.

– 1 6 – I EC TS 60079-46: 201 7 © I EC 201 7

8.3 Determin ing temperature class or maximum surface temperature marking

The temperature cl ass or maximum surface temperature marking for the equ ipmen t assembl y

shal l be based on the fo l l owing :

– the l owest temperature class code (e. g . T3 i s l ower than T6) or h i ghest maximum surface

temperature of any of the Ex Equ ipment, i ncl ud ing Ex Components that were assessed as

part of th is equ ipment assembl y, for the i nvolved explos ive atmospheres, as appl icable, as l ong as the i tems are operati ng wi th i n thei r speci fied ambien t temperature range;

– other attribu tes of the equ ipment assembl y construction that may affect the temperature

cl ass or maximum surface temperature marking (e . g . hot surfaces) .

To determ ine i f the Ex Equ ipmen t i s operati ng wi th i n each i tem ’s speci fied ambien t

temperature range, a rou tine temperature test may be performed i n accordance wi th IEC 60079-0. Shou ld an i tem exceed i ts speci fi ed ambien t temperature range, then correcti ve

actions are requ ired .

NOTE Use of a motor wi th a converter, i f the motor i s not d es igned for operati on from a converter, can affect the temperatu re ri se of the motor.

8.4 Determin ing Equ ipment Protection Level (EPL) marking

The EPL marking for the equ ipment assembl y shal l be based on the fo l l owi ng :

– the EPL marking for the l owest Level of Protection of any of the Ex Equ ipment, i ncl ud ing

Ex Components that were assessed as part of th is equ ipment assembly, for the involved

explos ive atmospheres, as appl icable;

– other attribu tes of the equ ipment assembl y construction that may affect the Level of

Protection (e. g . external enclosure materia l surface area) .

For Ex Equ ipmen t that i s not marked wi th an EPL, the defau l t re lati onsh ip between types of protection and EPLs from IEC 60079-1 4 shal l be used to determ ine the EPL for that i tem of

Ex Equ ipment.

8.5 Determin ing ambient temperature range marking

The ambien t temperature range marking for the equ ipment assembly shal l be based on the

fol l owing :

– l owest upper maximum temperature that i s common to a l l i tems and the h ighest l ower

m in imum temperature that i s common to a l l i tems that were assessed as part of th is

equ ipment assembl y;

– other attribu tes of the equ ipment assembly construction that may affect the ambien t

temperature range (e. g . cable ambient ratings) .

Measures may be requ i red to main ta in the Ex Equ ipment wi th in i ts marked ambien t

temperature range.

8.6 Determin ing ingress protection ( IP Code) rating

Assignmen t of the I P rating of the assembl y may be made based on the rati ng of the

i nd ividual i tems of equ ipment and the i n terconnecting accessories. J usti fication for the

ass igned rati ngs sha l l be documented .

Cons ideration may be g i ven to Ex Equ ipment used i n the assembl y that i s afforded supplementa l protection by the assembl y construction (e . g . a pre-manufactured room where

some i tems of the assembly are moun ted wi th i n the room and other i tems are mounted

external l y to the room).

___________



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Documents

Get more FREE standards from Standard Sharing Group and ... TS 60079-46-2017.pdf · 0 !1! ( ,' ! ! *!''#%# !"# & *!" ( " "2 +,# &" !'' -* 3

Get more FREE standards from Standard Sharing Group and ... TS 60079-46-2017.pdf · 0 !1! ( ,' ! ! !''#%# !"# & !" ( " "2 +,# &" !'' -* 3