scope:

This standard specifies requirements for the construction, testing and marking for Group II electrical apparatus with type of protection, "n" intended for use in Class I, Zone 2 hazardous (classified) locations as defined by the National Electrical Code® (NEC®), ANSI/NFPA 70.

This standard is applicable to non-sparking electrical apparatus and also to electrical apparatus 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 ANSI/ISA-60079-0.

This standard supplements the general requirements in ANSI/ISA-60079-0.

NOTE 1 A non-incendive component is limited in use to the particular circuit for which it has been shown to be nonignition capable and, therefore, cannot be separately assessed as complying with this standard.

NOTE 2 Compliance with this standard does not imply any removal of, or lowering of the requirements of any other standard with which the electrical apparatus complies.

NOTE 3 This part supplements, and may enhance, the requirements for apparatus for normal industrial applications. Where compliance with other IEC standards is indicated, such as IEC 60034 for motors and IEC 60598-2 for luminaires, proving compliance to those standards is normally the responsibility of the manufacturer.

NOTE 4 The National Electrical Code^® (NFPA 70^®) through the 2008 edition only recognizes types of protection "nA", "nC" and "nR" and not "nL". See note in 35.1.