ISA 60079-15

This standard 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 standard 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 capabl e 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/ISA60079-0.

This standard supplements and modifies the general requirements of ANSI/ISA-60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of ANSI/ISA-60079-0, the requirement of this standard takes precedence.

NOTE 1 The clause number in the above table is shown for information only. The applicable requirements of ANSI/ISA-60079-0 are identified by the clause title which is normative. This document was written against the specific requirements of ANSI/ISA-60079-0 (ed. 5.0). The clause numbers for the previous edition are shown for information only. This is to enable the General Requi rements ANSI/ISA-60079-0 (ed. 5.0) to be used where necessary with this part of ANSI/ISA-60079. Where there were no requirements, indicated by "NR" or there is a conflict between requirements, the later edition requirements take precedence.

NOTE 2 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.

NOTE 3 Compliance with this standard does not imply any removal of, or lowering of the requirements of any other standard with which the electrical equipment complies.

NOTE 4 This part of ANSI/ISA-60079 supplements, and may enhance, the requirements for equipment 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 5 Type of protection "n" provides Equipment Pro tection Level (EPL) Gc. For further information, see ANSI/ISA-60079-0.