User's Guide

Table Of Contents
16 For your safety
the combination may only be used in a Gas Class I
hazardous (classified) location.
Division 2 rated radios and accessories may only be
used in Division 2 or Zone 2 hazardous (classified)
locations.
Division 2, Group A radios and accessories may be
used in Division 2, Group B, C, or D areas.
Any item approved to Group D will limit the radio sys-
tem to Group D areas. For use in a Group A area, all
items must be approved to Group A.
Temperature class
Different ambient temperature ranges apply for the T3
and T4 temperature classes. The item with the most
restrictive temperature range will determine the allowed
temperature range of the radio system. T4-rated radios
and accessories can be used in T3 areas, within the rules
stated above.
Entity parameters
The Entity Concept allows interconnection of IS/NI
equipment with associated equipment when the following
is true:
Ui
Uo, Ii
Io, Pi
Po, Ci
Co, Li
Lo, and Li/Ri
Lo/Ro.
The installation must be in accordance with the following
standards:
National Electrical Code (NEC), ANSI/NFPA 70, Arti-
cles 504 and 505
Canadian Electrical Code (CEC) Part I, CAS C22.1
ANSI/ISA-RP12.06.01
EN/IEC 60079-25
relevant local regulations.