Honeywell ST 3000 - Manual (Page 53)

4.3 Wiring ST 3000 Transmitter,
Continued
Conduit seal Transmitters installed as explosionproof in a Class I, Division 1, Group
A Hazardous (Classified) Location in accordance with ANSI/NFPA 70,
the US National Electrical Code (NEC), require a “LISTED”
explosionproof seal to be installed in the conduit, within 18 inches of
the transmitter. Crouse-Hinds
® type EYS/EYD or EYSX/EYDX are
examples of “LISTED” explosionproof seals that meets this
requirement.
Transmitters installed as explosionproof in a Class I, Division 1, Group
B, C or D Hazardous (Classified) Locations do not require an
explosionproof seal to be installed in the conduit.
NOTE: Installation should conform to all national and local electrical
code requirements.
WARNING
When installed as explosionproof in a Division 1 Hazardous Location,
keep covers tight while the transmitter is energized. Disconnect power
to the transmitter in the non-hazardous area prior to removing end caps
for service.
When installed as nonincendive equipment in a Division 2 Hazardous
Location, disconnect power to the transmitter in the non-hazardous area,
or determine that the location is non-hazardous prior to disconnecting or
connecting the transmitter wires.
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2/05 ST 3000 Release 300 Installation Guide 43