Explosive Atmospheres - Part 7: Equipment protection by increased safety 'e'
This part of IEC 60079 specifies the requirements for the design, construction, testing and marking of electrical apparatus with type of protection increased safety "e" intended for use in explosive gas atmospheres. This standard applies to electrical apparatus where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. Additional measures are applied to ensure that the apparatus does not produce arcs, sparks, or excessive temperatures in normal operation or under specified abnormal conditions.
1DV.1.1 This standard specifies the requirements for the design, construction, testing and marking of electrical apparatus with type of protection increased safety "e" intended for use in Class I, Zone 1, Groups IIA, IIB, and IIC hazardous (classified) locations. This standard applies to electrical apparatus where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. Additional measures are applied to ensure that the apparatus does not produce arcs, sparks, or excessive temperatures in normal operation or under specified abnormal conditions.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
1DV.2.1 Replace "IEC 60079-0" with "UL 60079-0".
NOTE Increased safety "e" can provide Equipment Protection Levels (EPL) Mb or Gb. For further information, see Annex i.
1.1DV.1.1 The U.S. version of IEC 60079-7 does not include requirements for Group I electrical apparatus.
1.2DV.1.1 Where references are made to other IEC standards, the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.
- UL Harmonized Standard Title Page
- Table of Contents
- UL Introduction
- IEC Foreword
- EXPLOSIVE ATMOSPHERES - Part 7: Equipment protection by increased safety "e"
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Constructional requirements for all electrical apparatus
- 4.1 General
- 4.2 Electrical connections
- 4.3 Clearances
- 4.4 Creepage distances
- 4.5 Solid electrical insulating materials
- 4.6 Windings
- 4.7 Temperature limitations
- 4.8 Wiring internal to apparatus
- 4.9 Degrees of protection provided by enclosures
- 4.10 Fasteners
- 5 Supplementary requirements for specific electrical apparatus
- 5.1 General
- 5.2 Rotating electrical machines
- 5.3 Luminaires
- 5.4 Caplights and handlights
- 5.5 Measuring instruments and instrument transformers
- 5.6 Transformers other than instrument transformers
- 5.7 Batteries
- 5.8 General purpose connection and junction boxes
- 5.9 Resistance heaters (other than trace heaters)
- 5.10 Other electrical apparatus
- 6 Type verifications and type tests
- 6.1 Dielectric strength
- 6.2 Rotating electrical machines
- 6.3 Luminaires designed for mains supply
- 6.4 Measuring instruments and instrument transformers
- 6.5 Transformers other than instrument transformers
- 6.6 Secondary batteries
- 6.7 General purpose connection and junction boxes
- 6.8 Resistance heating devices and resistance heating units
- 6.9 Terminal insulating material tests
- 7 Routine verifications and routine tests
- 7.1 Dielectric tests
- 7.2 Dielectric tests for batteries
- 7.3 Inter-turn overvoltage tests
- 8 Ex component certificates
- 8.1 General
- 8.2 Terminals
- 9 Marking and instructions
- 9.1 General marking
- 9.2 Instructions for use
- 9.3 Warning markings
- Annex A (normative) - Cage motors - Methods of test and of calculation
- Annex B (normative) - Type tests for specific forms of resistance heating devices or resistance heating units (other than trace heater)
- Annex C (informative) - Cage motors - Thermal protection in service
- Annex D (informative) - Resistance heating devices and units - Additional electrical protection
- Annex E (informative) - Combinations of terminals and conductors for general purpose connection and junction boxes
- Annex F (informative) - Dimensions of copper conductors
- Annex G (informative) - Potential stator winding discharge risk assessment - Ignition risk factors
- Annex H (normative) - Test procedure for T8, T10 and T12 lamps
- Annex I (informative) - Introduction of an alternative risk assessment method encompassing [lsquo ]Equipment Protection Levels[rsquo ] for Ex Equipment
- Edition Number: 4
- Edition Date: 10/15/2008
- Price Code: G
- Type: ulisaiec
- ANSI Approved: 05/31/2013
- DOD Approved: —