ANSI/ISA TR12.12.04-2011

A location in which the fire or explosion hazard exists infrequently and for short periods is designated as a Division 2 or Zone 2 location. Two of the primary protection techniques for Division 2 or Zone 2 locations are Nonincendive equipment or Non-sparking equipment. This Technical Report is intended to explain these protection techniques and to clarify the associated terminology. This Technical Report also addresses field wiring for Division 2/Zone 2 locations.