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Eth standard
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If you want to obtain a copy of any the following Draft Ethiopian Standards, email: [email protected] or [email protected]
For further information on draft Ethiopian standards, please contact us at +251 116-460567 or Fax: +251 116-460880/81 TC 47
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
1. Slotted countersunk flat head screws (common head style) Product grade A
2009 ES ISO 2009: 2012
2. Rolling bearings Instrument precision bearings Part 1: Boundary dimensions, tolerances and characteristics of metric series bearings
1224-1 ES ISO 1224-1:2012
3. Plain bearings Wrapped bushes Part 6: Checking the inside diameter
3547-6 ES ISO 3547-6:2012
4. Plain bearings Wrapped bushes Part 7: Measurement of wall thickness of thin-walled bushes
3547-7 ES ISO 3547-7:2012
5. Button head screws Part 1: Hexagon socket button head screws
7380-1 ES ISO 7380-1:2012
6. Button head screws Part 2:Hexagon socket button head screws with collar
7380-2 ES ISO 7380-2:2012
7. Information processing-9 track.12,7mm(0.5in) wide magnetic tape for information interchange format and recording,using group codin at 246 cpmm (6250 cpi)
5652 ES ISO 5652:2012
8. Plastics piping systems for water supply and for buried and above-ground drainage and sewerage under pressure Unplasticized poly(vinyl chloride) (PVC-U) Part 1:General
1452-1 ES ISO 1452-1:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
9. Plastics piping systems for water supply and for buried and above-ground drainage and sewerage under pressure Unplasticized poly(vinyl chloride) (PVC-U) Part 2:Pipes
1452-2 ES ISO 1452-2:2012
10. and for buried and above-ground drainage and sewerage under pressure Unplasticized poly(vinyl chloride) (PVC-U) Part 4: Valves
1452-4 ES ISO 1452-4:2012
11. Plastics piping systems for water supply and for buried and above-ground
drainage and sewerage under pressure Unplasticized poly(vinyl chloride) (PVC-U) Part 5:Fitness for purpose of the system
1452-5 ES ISO 1452-5:2012
12. Thermoplastics pipes Longitudinal reversion Test method and
parameters 1205 ES ISO 2505:2012
13. Plastics piping systems Polyethylene (PE) pipes and fittings for water
supply Part 1:General
4427-1 ES ISO 4427-1:2012
14. Plastics piping systems Polyethylene (PE) pipes and fittings for water
supply Part 2: Pipes
4427-2 ES ISO 4427-2:2012
15. Plastics piping systems Polyethylene (PE) pipes and fittings for water
supply Part 3:Fittings
4427-3 ES ISO 4427-3:2012
16. Plastics piping systems Polyethylene (PE) pipes and fittings for water
supply Part 5: Fitness for purpose of the system
4427-5 ES ISO 4427-5:2012
17. Vacuum technology Mounting dimensions of pipeline fittings
Part 1: Non knife-edge flange type ES ISO 9803-1:2012
18. Vacuum technology Mounting dimensions of pipeline fittings
Part 2: Knife-edge flange type ES ISO 9803-2:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
19. Restrained joint systems for ductile iron pipelines Design rules and type testing
ES ISO 10804:2012
20. Non-destructive testing of steel tubes Part 3: Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections
ES ISO 10893-3:2011(E)
21. Non-destructive testing of steel tubes
Part 6: Radiographic testing of the weld seam of welded steel tubes for the detection of imperfections
ES ISO 10893-6:-:2012
22. Non-destructive testing of steel tubes Part 8: Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections
ES ISO 10893-8:2012
23. Non-destructive testing of steel tubes Part 9: Automated ultrasonic testing for the detection of laminar imperfections in strip/plate used for the manufacture of welded steel tubes
ES ISO 10893-9:2012
24. Non-destructive testing of steel tubes Part 11: Automated ultrasonic testing of the weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections
ES ISO10893-11:2012
25. Fans Dimensions ES ISO 13351:2012 26. Oxygen/fuel gas blowpipes (cutting machine type) with cylindrical barrels
- General specifications and test methods 389-7 ES ISO 5186:2012
27. Metallic and other inorganic coatings Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium
389-8 ES ISO1456:2012
28. Assembly tools for screws and nuts Screwdrivers for slotted-head screws Part 1: Tips for hand- and machine-operated screwdrivers
389-9 ES ISO 2380-1:2012
29. Assembly tools for screws and nuts Screwdrivers for slotted-head screws Part 2: General requirements, lengths of blades and marking of hand-operated screwdrivers
8253-1 ES ISO 2380-2:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
30. Gas welding equipment Pressure regulators and pressure regulators with flow-metering devices for gas cylinders used in welding, cutting and allied processes up to 300 bar (30 MPa
8253-2 ES ISO 2503:2012
31. Welding consumables Covered electrodes for manual metal arc welding of stainless and heat-resisting steels Classification
8253-3 ES ISO 3581:2012
32. Metallic and other inorganic coatings Electrodeposited silver and silver alloy coatings for engineering purposes Specification and test methods
1953 ES ISO 4521:2012
33. Metal-cutting band saw blades Part 2: Characteristics and dimensions
1999 ES ISO 4875-2:2012
34. Gas welding equipment Blowpipes for gas welding, heating and cutting Specifications and tests
7029 ES ISO 5172:2012
35. Tool holders for internal turning with cylindrical shank for indexable inserts Part 1:Designation, styles, dimensions and calculation for corrections
11904-1 ES ISO 5609-1:2012
36. Anodizing of aluminium and its alloys Measurement of abrasion resistance of anodic oxidation coatings
11904-2 ES ISO 8251:2012
37. Anodizing of aluminium and its alloys Specification for hard anodic oxidation coatings on aluminium and its alloys
12124 ES ISO 10074:2012
38. Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel in structures Part 1: General principles of design and corrosion resistance
10217 ES ISO 14713-1:2012
39. Non-destructive testing of welds Radiographic testing Part 1: X- and gamma-ray techniques with film
16832 ES ISO 17636-1:2013
40. Non-destructive testing of welds Radiographic testing Part 2: X- and gamma-ray techniques with digital detectors
16 ES ISO 17636-2:2013
41. Metallic and other inorganic coatings Electrodeposited gold and gold alloy coatings for electrical, electronic and engineering purposes Specification and test methods
1683 ES ISO 27874:2012
42. Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 1:Determination of resistance to chemical corrosion by acids at room temperature
ES ISO 28706-1:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
43. Vitreous and porcelain enamels Determination of resistance to chemical corrosion Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their vapours
28706-2 ES ISO 28706-2:2012
44. Vitreous and porcelain enamels Production of specimens for testing enamels on sheet steel, sheet aluminium and cast iron
28764 ES ISO28764:2012
45. Conveyor belts with - Heat resistance - rubber cover requirement and Test method
4195 ES ISO 4195: 2008
46. Conveyor belts Transverse flexibility (troughability) Test method 703 ES ISO 703:2012 47. Cranes Requirements for mechanisms
Part 1: General 10972-1 ES ISO 10972-1:2012
48. Cranes Requirements for mechanisms Part 2: Mobile cranes
10972-2 ES ISO 10972-2:2009
49. Cranes Requirements for mechanisms Part 3: Tower cranes
10972-3 ES ISO 10972-3:2012
50. Cranes Requirements for mechanisms Part 4: Jib cranes
10972-4 ES ISO 10972-4:2012
51. Cranes Requirements for mechanisms Part5: Bridge and gantry cranes
10972-5 ES ISO 10972-5:2012
52. Pipe threads where pressure-tight joints are made on the threads Part 2: Verification by means of limit gauges
7-2 ES ISO 7-2:2005
53. pipe threads whe4re pressure-tight joints are made on the threads part 1 dimensions, tolerances and designation
7-1 ES ISO 7-1:2002
54. ISO general purpose screw threads basic profile Part 1: Metric screw threads
68-1 ES ISO 68-1:2003
55. ISO general purpose metric screw threads- General plan 260 ES ISO 260:2003 56. ISO general purpose metric screw threads-Selected sizes for screws, bolts and
nuts 262 Es iso 262:2003
57. ISO general purpose metic screw threads-Basic dimensions 724 ES ISO 724:2003 58. Mechanical properties of fasteners made of carbon steel and alloy steel
Part 1: Bolts, screws and studs 898-1 ES ISO 898-1:2002
59. Mechanical properties of fasteners Part 2 Nuts with specified roof load valves-Coarse thread
898-2 ES ISO 898-2:2002
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
60. Mechanical properties of fasteners Part 6 Nuts with specified proof load values-Fine pitch thread
898-6 ES ISO 898-6:2005
61. Mechanical properties of fasteners Part 7 Torsional test and minimum torques for bolts and srews with nominal diameters 1 mm to 10 mm
898-7 ES ISO 898-7:2005
62. ISO general purpose metric screw threads-Tolerances Part 1 Principles and basic data
965-1 ES ISO 965-1:2003
63. ISO general purpose metric screw threads-Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads-Medium quality
965-2 ES ISO 965-2:2003
64. ISO general purpose metric screw threads-Tolerances Part 3: Deviation for constructional screw threads
965-3 ES ISO 965-3:2003
65. ISO general purpose metric screw threads-Tolerances Pare 4 Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing
965-4 ES ISO 965-4:2005
66. ISO general purpose metric screw threads-Tolerances- Part 5 Limits of sixes for internal screw threads to mate with hot-dip galvanized external screw threadss with maximum size of tolerance postion h before galvanizing
965-5 ES ISO 965-5:2005
TC 51
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
1 Metallic materials Knoop hardness test Part 1: Test method 4545-1 ES ISO 4545-1:2012
2 Metallic materials Wire Simple torsion test 7800 ES ISO 7800:2012
3 Metallic materials Fatigue testing Statistical planning and analysis of data
12107 ES ISO 12107:2012
4 Metallic materials Fatigue testing Fatigue crack growth method 12108 ES ISO 12108:2012
5 Structural steels Part.1:General technical delivery conditions for hot-rolled products
630-1 ES ISO 630-1:2012
6 Structural steels Part.2: Technical delivery conditions for stru ctural steels for general purposes
630-2 ES ISO 630-2:2012
7 Heat-treatable steels, alloy steels and free-cutting steels Part 2: Alloy steels for quenching and tempering
683-2 ES ISO 683-2:2012
8 Microstructure of cast irons Part 1: Graphite classification by visual analysis
945-1 ES ISO 945-1:2012
9 Microstructure of cast irons Part 1: Graphite classification by vis ual analysis
945-1 ES ISO 945-1/cor:2012
10 Petroleum and natural gas industries Steel pipe for pipeline transportation systems
3183 ES ISO 3183:2012
11 Hot-rolled carbon steel sheet of commercial and drawing qualities 3573 ES ISO 3573:2012 12 Cold-reduced carbon steel sheet of commercial and drawing qualities 3574 ES ISO 3574:2012
13 Sintered metal materials, excluding hardmetals Determination of apparent hardness and microhardness
4498 ES ISO 4498:2012
14 Metallic materials Dynamic force calibration for uniaxial fatigue testing Part 1: Testing systems
4965-1 ES ISO 4965-1:2012
15 Metallic materials Dynamic force calibration fatigue testing Part 2: Dynamic calibration device (DCD)
4965-2 ES ISO 4965-2:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
16 Steel castings Liquid penetrant inspection 4987 ES ISO 4987:2012
17 Continuous hot-dip aluminium-siliconcoated cold-reduced carbon steel sheet of commercial and drawing qualities
5000 ES ISO 5000:2012
18 Cold-reduced carbon steel sheet for vitreous enamelling 5001 ES ISO 5001:2012
19 Electrolytic tin-coated cold-reduced carbon steel sheet of commercial and drawing qualities
5950 ES ISO 5950:2012
20 Hot-rolled steel sheet of higher yield strength with improved formability 5951 ES ISO 5951:2012
21 Continuously hot-rolled steel sheet of structural quality with improved atmospheric corrosion resistance
5952 ES ISO 5952:2012
22 Hot-rolled steel strip of structural quality 6316 ES ISO 6316:2012
23 Hot-rolled carbon steel strip of commercial and drawing qualities 6317 ES ISO 6317:2012
24 Wrought aluminium and aluminium alloys Sheets, strips and plates Part 1:Technical conditions for inspection and delivery
6361-1 ES ISO 6361-1:2012
26 Wrought aluminium and aluminium alloys Extruded rods/bars, tubes and profiles Part 3:Extruded rectangular bars Tolerances on shape and dimensions
6362-3 ES ISO 6362-3:2012
27 Wrought aluminium and aluminium alloys Extruded rods/bars, tubes and profiles Part 4: Profiles Tolerances on shape and dimensions
6362-4 ES ISO 6362-4:2012
28 Wrought aluminium and aluminium alloys Extruded rods/bars, tubes and profiles Part 5:Round, square and hexagonal bars Tolerances on shape and dimensions
6362-5 ES ISO 6362-5:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
29 Wrought aluminium and aluminium alloys Cold-drawn rods/bars, tubes and wires Part 4:Drawn rectangular bars and wires Tolerances on form and dimensions
6363-4 ES ISO 6363-4:2012
30 Wrought aluminium and aluminium alloys Cold-drawn rods/bars, tubes and wires Part 5:Drawn square and hexagonal bars and wires Tolerances on form and dimensions
6363-5 ES ISO 6363-5:2012
31 Corrosion of metals and alloys Stress corrosion testing Part 1: Gene ral guidance on testing procedures
7539-1 ES ISO 7539-1:2012
32 Corrosion of metals and alloys Stress corrosion testing Part 6:Preparation and use of precracked specimens for tests under constant load or constant displacement
7539-6 ES ISO 7539-6:2012
33 Magnesium and magnesium alloys Unalloyed magnesium Chemical composition
8287 ES ISO 8287:2012
34 Corrosion tests in artificial atmospheres Salt spray tests 9227 ES ISO 9227:2012 35 Steel flat products for pressure purposes Technical delivery
conditions Part 1:General requirements
9328-1 ES ISO 9328-1:2012
36 Steel flat products for pressure purposes Technical delivery conditions Part 2: Non-alloy and alloy steels with specified elevated temperature properties
9328-2 ES ISO 9328-2:2012
37 Steel flat products for pressure purposes Technical delivery conditions Part 3:Weldable fine grain steels, normalized
9328-3 ES ISO 9328-3:2012
38 Steel flat products for pressure purposes Technical delivery conditions Part 4: Nickel-alloy steels with specified low temperature properties
9328-4 ES ISO 9328-4:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
39 Steel flat products for pressure purposes Technical delivery conditions Part 5:Weldable fine grain steels, thermomechanically rolled
9328-5 ES ISO 9328-5:2012
40 Continuously hot-rolled stainless steel Tolerances on dimensions and form Part 1:Narrow strip and cut lengths
9444-1 ES ISO 9444-1:2012
4` Continuously hot-rolled stainless steel Tolerances on dimensions and form Part 2:Wide strip and sheet/plate
9444-2 ES ISO 9444-2:2012
42 Continuously cold-rolled stainless steel Tolerances on dimensions and form Part 2:Wide strip and plate/sheet
9445-2 ES ISO 9445-2:2012
43 Metallic materials Calibration of extensometer systems used in uniaxial testing
9513 ES ISO 9513:2012
44 Corrosion of metals and alloys Alternate immersion test in salt solution 11130 ES ISO 11130:2012
45 Cold-reduced steel sheet of higher yield strength with improved formability 13877 ES ISO 13877:2012
46 Continuous hot-dip zinc-5 % aluminium alloy coated steel sheet 14788 ES ISO 14788:2012
47 Hot-rolled steel sheet products Dimensional and shape tolerances 16160 ES ISO 16160:2012
48 Cold-rolled steel sheet products Dimensional and shape tolerances 162 ES ISO 162:2012
49 Continuously hot-dipped coated steel sheet products Dimensional and shape tolerances
16163 ES ISO 16163:2012
50 Microstructure of cast irons Part 2:Graphite classification by image analysis
945-2 ES ISO TR/945-2:2012
51 Non-destructive testing Penetrant testing Part 1:General principles
3452-1 ES ISO 3452-1:2012
S.N.
Document Title
Designation Status () FDES No. ES No. New Reaffirmed Revised
52 Non-destructive testing Image quality of radiographs Part 1: Image quality indicators (wire type) Determination of image quality value
19232-1 ES ISO 19232-1:2012
TC 64
S.N.
Document Title Designation Status ()
FDES No. ES No. New Reaffirmed Revised 1 Cartridge fuses for voltages up to and including 1 000 V a.c. and 1 500 V d.c.
Part 5: Specification of supplementary requirements for fuse-links for use in a.c. electricity supply networks
1276 ES 1276:2005
2 Specification for residual current-operated circuit-breakers
1423 ES 1423:2005
3 Specification for single phase street lighting fuses (cut-outs) for low-voltage public electricity distribution systems. 25 A rating for highway power supplies and street furniture
1634 ES 1634:2005
4 Direct acting indicating analogue electrical measuring instruments and their accessories. Specification for special requirements for wattmeters and varmeters
1279 ES 1279:2005
5 Electric cable soldering sockets Specification
1287 ES 1287:2005
6 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
7 13 A plugs, socket-outlets and adaptors. Specification for adaptors
1348 ES 1348:2005
S.N.
Document Title
Designation Status ()FDES No. ES No. New Reaffirmed Revised
8 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
9 Specification. Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors
1925 ES 1925:2005
1 13 A plugs, socket-outlets and adaptors. Specification for rewirable and non-rewirable 13 A fused plugs
1346 ES 1346:2005
1 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
1 13 A plugs, socket-outlets and adaptors. Specification for adaptors
1348 ES 1348:2005
1 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
1 Specification. Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors
1925 ES 1925:2005
1 Specification for
Protected-type non-reversible plugs, socket-outlets cable-couplers and appliance-couplers with earthing contacts for single phase a.c. circuits up to 250 volts
1289 ES 1289:2005
1 Specification.
Flame proof enclosure of electrical apparatus
1291 ES 1291:2005
S.N.
Document Title
Designation Status ()FDES No. ES No. New Reaffirmed Revised
1 Flexible steel conduit for cable protection and flexible steel tubing to enclose flexible drives. Flexible steel conduit and adaptors for the protection of electric cable
1312 ES 1312:2005
1 Terminal markings for electrical machinery and apparatus. Terminal markings for rotating electrical machinery
1317 ES 1317:2005
1 Specification. Rubber mats for electrical purposes
1331 ES 1331:2005
2 Electrical earthing. Clamps for earthing and bonding. Specification
1332 ES 1332:2005
2 13 A plugs, socket-outlets and adaptors. Specification for rewirable and non-rewirable 13 A fused plugs
1346 ES 1346:2005
2 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
2 Specification. Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors
1925 ES 1925:2005
2 13 A plugs, socket-outlets and adaptors. Specification for adaptors
1348 ES 1348:2005
2 13 A plugs, socket-outlets and adaptors. Specification for 13A fused connection units switched and unswitched
1349 ES 1349:2005
2 Tubular fluorescent lamps for general lighting service. Specification for lamps used in the United Kingdom not included in BS EN 60081, BS EN 60901, BS EN 61195 and BS EN 61199
1359 ES 1359:2005
2 Electric cables. Accessories. Bitumen-based filling compounds
1360 ES 1360:2005
S.N.
Document Title
Designation Status ()FDES No. ES No. New Reaffirmed Revised
2 Specification for straight concrete and clayware cable covers.
1388 ES 1388:2005
2 Method for determining the thermal classification of electrical insulation
1400 ES 1400:2005
3 Specification for photoelectric control units for road lighting
1535 ES 1535:2005
3 Method of test for temperature coefficient of resistance of alloy wire for precision resistors
1414 ES 1414:2005
3 Specification for residual current-operated circuit-breakers
1423 ES 1423:2005
3 Luminaires. Particular requirements. Specification for fixed general purpose luminaires
1430 ES 1430:2005
3 Luminaires. Particular requirements. Specification for luminaires for emergency lighting
1431 ES 1431:2005
3 Cable trunking. Steel surface trunking
1440 ES 1440:2005
3 Photometric data for luminaires. Photometric measurements
1449 ES 1449:2005
3 Photometric data for luminaires. Method of photometric measurement of battery-operated emergency lighting luminaires
1450 ES 1450:2005
3 Specification for 600/1000 V and 1900/3300 V armoured electric cables having thermosetting insulation
1483 ES 1483:2005
3 Electric cables. PVC insulated, non-armoured cables for voltages up to and including 450/750 V, for electric power, lighting and internal wiring
1537 ES 1537:2005
S.N.
Document Title
Designation Status ()FDES No. ES No. New Reaffirmed Revised
4 Electric cables. Single core unsheathed heat resisting cables for voltages up to and including 450/750 V, for internal wiring
1538 ES 1538:2005
4 Specification for PVC-insulated cables for switchgear and controlgear wiring
1558 ES 1558:2005
4 Specification for 600/1000 V and 1900/3300 V armoured electric cables having PVC insulation
1563 ES 1563:2005
4 Specification for conductors in insulated cables and cords
1564 ES 1564:2005
4Electrical apparatus with protection by enclosure for use in the presence of combustible dusts. Guide to selection, installation and maintenance
1593 ES 1593:2005
4 Electric cables. Flexible cords rated up to 300/500 V, for use with appliances and equipment intended for domestic, office and similar environments
1594 ES 1594:2005
4 Specification for portable residual current devices
1620 ES 1620:2005
4 Specification for single phase street lighting fuses (cut-outs) for low-voltage public electricity distribution systems. 25 A rating for highway power supplies and street furniture
1634 ES 1634:2005
4 Specification for insulating and sheathing materials for cables. General introduction
1635 ES 1635:2005
4 Specification for insulating and sheathing materials for cables. PVC insulating compounds. Harmonized types
1636 ES 1636:2005
S.N.
Document Title
Designation Status ()FDES No. ES No. New Reaffirmed Revised
5 Specification for insulating and sheathing materials for cables. PVC insulating compounds. Hard grade types
1637 ES 1637:2005
5 Nominal voltages for low voltage public electricity supply systems
1638 ES 1638:2005
5 Electric cables. Flexible cables rated up to 450/750V, for use with appliances and equipment intended for industrial and similar environments
1642 ES 1642:2005
5 Specification. Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors
1925 ES 1925:2005
5 Isolating transformers and safety isolating transformers. Specification for transformers for reduced system voltage
1944 ES 1944:2005