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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN 60079-7, BSI BS EN IEC 60079-15
Explosive atmospheres -- Equipment protection by type of protection 'n'
This part of IEC 60079 specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection, 'n' intended for use in explosive gas atmospheres. This standard applies to electrical equipment where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c.
This part of IEC 60079 is applicable to non-sparking electrical equipment and also to electrical equipment with parts or circuits producing arcs or sparks or having hot surfaces which, if not protected in one of the ways specified in this standard, could be capable of igniting a surrounding explosive gas atmosphere. This standard describes several different methods by which this can be achieved which may be combined with other methods described in IEC 60079‑0 .
This standard supplements and modifies the general requirements of IEC 60079‑0 , except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079‑0 , the requirement of this standard takes precedence.
| Clause of IEC 60079‑0 | IEC 60079‑0 clause application to IEC 60079‑15 | ||||
|---|---|---|---|---|---|
| Ed. 5.0 (2007) (informative) |
Ed. 6.0 1 (future edition) (informative) |
Clause / Subclause title (normative) |
Protected spar king | Non sparking | Restricted breathing |
| nC | nA | nR | |||
| 4 | 4 | Equipment grouping | Applies | Applies | Applies |
| 4.1 | 4.1 | Group I | Excluded | Excluded | Excluded |
| 4.2 | 4.2 | Group II | Applies | Applies | Applies |
| 4.3 | 4.3 | Group III | Excluded | Excluded | Excluded |
| 4.4 | 4.4 | Equipment for a particular explosive atmosphere | Applies | Applies | Applies |
| 5.1 | 5.1 | Environmental influences | Applies | Applies | Applies |
| 5.1.1 | 5.1.1 | Ambient temperature | Applies | Applies | Applies |
| 5.1.2 | 5.1.2 | External source of heating or cooling | Applies | Applies | Applies |
| 5.2 | 5.2 | Service temperature | Applies | Applies | Applies |
| 5.3.1 | 5.3.1 | Determination of maximum surface temperature | Applies | Applies | Applies |
| 5.3.2.1 | 5.3.2.1 | Group I electrical equipment | Excluded | Excluded | Excluded |
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