1 Scope
Modification of Clause 1 to replace with the following: This
part of IEC 60079
document
specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection “n” which includes; sealed devices “nC”, hermetically sealed devices “nC”, non-incendive components “nC” and restricted breathing enclosures “nR” intended for use in explosive gas atmospheres. This part of IEC 60079
document
applies to electrical equipment where the rated input voltage does not exceed 15 kV r.m.s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV, for example starters for HID luminaires.
Where references are made to IEC, IEC/IEEE, ISO, ISO/IEC standards, the referenced requirements found in these standards shall apply as modified by any applicable US National Differences for the standard (see Clause 2).
This
part of IEC 60079
document
supplements and modifies the general requirements of IEC 60079-0
UL 60079-0
, except as indicated in Table 1. Where a requirement of this part of IEC 60079
document
conflicts with a requirement of IEC 60079-0
UL 60079-0
, the requirement of this part of IEC 60079
document
takes precedence.
Table 1 Relationship of <p>IEC 60079-15</p><p>UL 60079-15</p> to <p>IEC 60079-0</p><p>UL 60079-0</p>
Clause of
IEC 60079-0
UL 60079-0
IEC 60079-0
UL 60079-0
clause application to IEC 60079-15
UL 60079-15
Ed. 6.0 (
2011
2013
)
Ed. 7.0
(future edition)
2019
Clause / Subclause title
Protected sparking
Restricted breathing
(informative)
(informative)
(normative)
"nC"
"nR"
3
3
Definitions
Applies
Applies
4
4
Equipment grouping
4.1
4.1
Group I
Excluded
Excluded
4.2
4.2
Group II
Applies
Applies
4.3
4.3
Group III
Excluded
Excluded
4.4
4.4
Equipment for a particular explosive atmosphere
Applies
Applies
5
5
Temperatures
5.1
5.1
Environmental influences
Applies
Applies
5.2
5.2
Service temperature
Applies
Applies
5.3
5.3
Maximum surface temperature
5.3.1
5.3.1
Determination of maximum surface temperature
Applies
Applies
5.3.2
5.3.2
Limitation of maximum surface temperature
5.3.2.1
5.3.2.1
Group I equipment
Excluded
Excluded
5.3.2.2
5.3.2.2
Group II equipment
Applies
Applies
5.3.2.3
5.3.2.3
Group III electrical equipment
Excluded
Excluded
5.3.3
5.3.3
Small component temperature for Group I and Group II equipment
Applies
Excluded
–
5.3.4
Component temperature of smooth surfaces for Group I or Group II equipment
(Applies for smaller than 10 000 mm
2
only)
Applies
Excluded
6
6
Requirements for all electrical apparatus
6.1
6.1
General
Applies
Applies
6.2
6.2
Mechanical strength
Applies
Applies
6.3
6.3
Opening times
Excluded
Applies
6.4
6.4
Circulating currents
Applies
Applies
6.5
6.5
Gasket retention
Applies
Applies
6.6
6.6
Electromagnetic and ultrasonic radiating equipment
Applies
Applies
7
7
Non-metallic enclosures and non-metallic parts of enclosures
7.1
7.1
General
7.1.1
7.1.1
Applicability
Applies
Applies
7.1.2
7.1.2
Specification of materials
Applies
Applies
7.2
7.2
Thermal endurance
7.2.1
7.2.1
Tests for thermal resistance
Applies
Applies
7.2.2
–
Material selection
Modified
Modified
–
7.2.2
Material selection
Applies
Applies
7.2.3
7.2.3
Alternative qualification for elastomeric sealing O-rings
Applies
Applies
7.3
7.3
Resistance to ultraviolet light
Applies
Applies
7.4
7.4
Electrostatic charges on external non-metallic materials
7.4.1
7.4.1
Applicability
Applies
Applies
7.4.2
7.4.2
Avoidance of build-up of electrostatic charge on Group I or Group II electrical equipment
Applies
Applies
7.4.3
7.4.3
Avoidance of build-up of electrostatic charge on equipment for Group III
Excluded
Excluded
7.5
7.5
External conductive parts
Applies
Applies
8
8
Metallic enclosures and metallic parts of enclosures
8.1
8.1
Material composition
Applies
Applies
8.2
8.2
Group I
Excluded
Excluded
8.3
8.3
Group II
Applies
Applies
8.4
8.4
Group III
Excluded
Excluded
NR
8.5
Copper alloys
Applies
Applies
9
9
Fasteners
9.1
9.1
General
Applies
Applies
9.2
9.2
Special fasteners
Excluded
Excluded
9.3
9.3
Holes for special fasteners
Excluded
Excluded
9.3.3
–
Hexagon socket set screws
Excluded
Excluded
–
9.4
Hexagon socket set screws
Excluded
Excluded
10
10
Interlocking devices
Excluded
Excluded
11
11
Bushings
Applies
Applies
12
–
Materials used for cementing
Modified
Modified
–
12
Reserved for future use.
Modified
Modified
13
13
Ex components
Applies
Applies
14
14
Connection facilities
Applies
Applies
15
15
Connection facilities for earthing and bonding conductors
Applies
Applies
16
16
Entries into enclosures
Applies
Applies
17
17
Supplementary requirements for electric machines
Excluded
Excluded
18
18
Supplementary requirements for switchgear
Excluded
18.1
18.1
Flammable dielectric
Excluded
Applies
18.2
18.2
Disconnectors
Excluded
Applies
18.3
18.3
Group I – Provisions for locking
Excluded
Excluded
18.4
18.4
Doors and covers
Excluded
Applies
19
–
Supplementary requirements for fuses
Excluded
Excluded
–
19
Reserved for future use.
Excluded
Excluded
20
20
Supplementary requirements for plugs and sockets
20.1
20.1
General
Applies
Applies
20.2
20.2
Explosive gas atmospheres
Excluded
Excluded
20.3
20.3
Explosive dust atmospheres
Excluded
Excluded
20.4
20.4
Energized plugs
Applies
Applies
21
21
Supplementary requirements for luminaires
21.1
21.1
General
Applies
Applies
21.2
21.2
Covers for luminaires of EPL Mb, EPL Gb or EPL Db
Excluded
Excluded
21.3
21.3
Covers for luminaires of EPL Gc or EPL Dc
Applies
Applies
21.4
21.4
Sodium lamps
Applies
Applies
22
22
Supplementary requirements for caplights and handlights
22.1
22.1
Group I caplights
Excluded
Excluded
22.2
22.2
Group II and Group III caplights and handlights
Excluded
Applies
23
23
Equipment incorporating cells and batteries
Applies
Applies
23.12
23.12
Replacement battery pack
Applies
Applies
24
24
Documentation
Modified
Modified
25
25
Compliance of prototype or sample with documents
Applies
Applies
26
26
Type tests
Applies
Applies
26.4
26.4
Tests of enclosures
26.4.1
26.4.1
Order of tests
26.4.1.1
26.4.1.1
Metallic enclosures, metallic parts of enclosures and glass or ceramic parts of enclosures
Applies
Applies
26.4.1.2
26.4.1.2
Non-metallic enclosures or non-metallic parts of enclosures
26.4.1.2.1
26.4.1.2.1
General
Applies
Applies
26.4.1.2.2
26.4.1.2.2
Group I electrical equipment
Excluded
Excluded
26.4.1.2.3
–
Group II and Group III electrical equipment
Modified
Modified
–
26.4.1.2.3
Group II and Group III electrical equipment
Applies
Applies
26.4.2
26.4.2
Resistance to impact
Applies
Applies
26.4.3
26.4.3
Drop test
Applies
Applies
26.4.4
26.4.4
Acceptance criteria
Applies
Applies
26.4.5
26.4.5
Degree of protection by enclosure
Applies
Applies
26.5
26.5
Thermal tests
26.5.1
26.5.1
Temperature measurement
Applies
Applies
26.5.1.1
26.5.1.1
General
Applies
Applies
26.5.1.2
26.5.1.2
Service Temperature
Applies
Applies
26.5.2
26.5.2
Thermal shock test
Applies
Applies
26.5.3
26.5.3
Small component ignition test (Group I and Group II)
Applies
Excluded
26.6
26.6
Torque test for bushings
Applies
Applies
26.7
26.7
Non-metallic enclosures or non-metallic parts of enclosures
26.7.1
26.7.1
General
Applies
Applies
26.7.2
–
Test temperatures
Modified
Modified
–
26.7.2
Test temperatures
Applies
Applies
26.8
–
Thermal endurance to heat
Modified
Modified
–
26.8
Thermal endurance to heat
Applies
Applies
26.9
26.9
Thermal endurance to cold
Applies
Applies
26.10
26.10
Resistance to light
26.10.1
26.10.1
General
Applies
Applies
26.10.2
26.10.2
Light exposure
Applies
Applies
26.10.3
26.10.3
Acceptace criteria
Applies
Applies
26.11
26.11
Resistance to chemical agents for Group I electrical equipment
Excluded
Excluded
26.12
26.12
Earth continuity
Applies
Applies
26.13
26.13
Surface resistance test of parts of enclosures of non-metallic materials
Applies
Applies
26.14
26.14
Measurement of capacitance
26.14.1
26.14.1
General
Applies
Applies
26.14.2
26.14.2
Test procedure
Applies
Applies
26.15
26.15
Verification of ratings of ventilating fans
Excluded
Excluded
26.16
26.16
Alternative qualification of elastomeric sealing Orings
Applies
Applies
–
26.17
Transferred charge test
Applies
Applies
27
27
Routine tests
Applies
Applies
28
28
Manufacturers responsibility
Applies
Applies
29
29
Marking
29.1
29.1
Applicability
Applies
Applies
29.2
29.2
Location
Applies
Applies
29.3
29.3
General
Applies
Applies
29.4
29.4
Ex marking for explosive gas atmospheres
Applies
Applies
29.5
29.5
Ex marking for explosive dust atmospheres
Excluded
Excluded
29.6
29.6
Combined types (or levels) of protection
Applies
Applies
29.7
29.7
Multiple types of protection
Applies
Applies
29.8
29.8
Ga equipment using two independent Gb types (or levels) of protection
Excluded
Excluded
–
29.9
Boundary wall
Excluded
Excluded
29.9
29.10
Ex Components
Applies
Applies
29.10
29.11
Small Ex Equipment and small Ex Components
Applies
Applies
29.11
29.12
Extremely small equipment and extremely small Ex Components
Applies
Applies
29.12
29.13
Warning markings
Applies
Applies
29.13
–
Alternate marking of equipment protection levels (EPLs)
Applies
Applies
29.13.1
–
Alternate marking of type of protection for explosive gas atmospheres
Applies
Applies
29.13.2
–
Alternate marking of type of protection for explosive dust atmospheres
Excluded
Excluded
29.14
29.14
Cells and batteries
Applies
Applies
29.15
29.15
Electrical machines operated with a converter
Applies
Applies
29.16
29.16
Examples of marking
Examples only
Examples only
30
30
Instructions
30.1
30.1
General
Applies
Applies
30.2
30.2
Cells and batteries
Applies
Applies
30.3
30.3
Electric machines
Excluded
Excluded
30.4
30.4
Ventilating fans
Excluded
Excluded
–
30.5
Cable glands
Applies
Applies
Annex A
Annex A
Supplementary requirements for Ex cable glands
Applies
Applies
Annex B
Annex B
Requirements for Ex components
Applies
Applies
Annex C
Annex C
Example of rig for resistance to impact test
Informative Annex
Informative Annex
Annex D
Annex D
Motors supplied by converters
Informative Annex
Informative Annex
Annex E
Annex E
Temperature evaluation of electric machines
Informative Annex
Informative Annex
Annex F
Annex F
Guideline flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
Informative Annex
Informative Annex
–
Annex G
Guidance flowchart for tests of cable glands
Informative Annex
Informative Annex
–
Annex H
Shaft voltages resulting in motor bearing or shaft brush sparking. Discharge energy calculation
Informative Annex
Informative Annex
Applies – This requirement of
IEC 60079-0
UL 60079-0
is applied without change.
Excluded – This requirement of
IEC 60079-0
UL 60079-0
does not apply.
Modified – This requirement of
IEC 60079-0
UL 60079-0
is modified as detailed in this standard.
NOTE 1 The clause number in the above table is shown for information only. The applicable requirements of
IEC 60079-0
UL 60079-0
are identified by the clause title which is normative. This document was written against the specific requirements of IEC 60079-0
UL 60079-0
(ed. 7.0). The clause numbers for the previous edition are shown for information only. This is to enable the general requirements of IEC 60079-0
UL 60079-0
(ed. 6.0) to be used where necessary with this part of IEC 60079-0
document
. Where there is a conflict between requirements, the later edition requirements take precedence.
NOTE 2 A shaded row in the above table indicates that this is a clause heading. In cases where the applicability is the same for all of the sub-clauses the ‘Applies’ or ‘Excluded’ is listed in the heading row and the sub-clauses are not expanded. Where the application of the individual sub-clauses may be different, these are expanded in the above table and the applicability for each is listed.
NOTE 3 A non-incendive component is limited in use to the particular circuit for which it has been shown to be non-ignition capable and, therefore, cannot be separately assessed as complying with this standard.
Under preparation. Stage at the time of publication: IEC/FDIS 60079-0:2017.