Safety Yamatake Corporation
8 ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
FM /CSA Nonincendive Apparatus
CAUTION
• The nonincendive apparatus can be installed only in Division 2 hazardous
(classified) locations for which the apparatus has been approved.
• Tampering and replacement of any components within the nonincendive
apparatus may impair safe use of the apparatus.
Installation requirements
1. Wiring of the nonincendive circuit is permitted using any of the methods suitable
for wiring in ordinary (unclassified) locations.
~Note Nonincendive apparatus is composed of all nonincendive circuits in
which any arc or thermal effect produced under normal operating condi-
tions of the apparatus is not capable of igniting the explosive atmo-
spheres. This protection technique is permitted for apparatus in those
Class I, Division 2, Class II, Division 2, and Class III locations. Nonin-
cendive apparatus looks like intrinsically safe apparatus but are not,
require associated apparatus (ex. shunt diode barriers).
2. In any raceway, junction box, or similar fitting, the conductors of the nonincen-
dive circuit cannot be placed with the conductors of any other system, unless (1)
the conductors of the two systems are separated by a suitable mechanical partition,
or (2) all of the conductors of either system are segregated by a grounded metal
shield.
3. It is recommended that separate nonincendive circuit conductors to be in sepa-
rate cables, unless (1) the conductors of each circuit are within a grounded metal
shield, or (2) the conductors of each circuit have insulation with a minimum thick-
ness of 0.01 inch (0.254 mm)
4. If a raceway (including conduit) and cable for a nonincendive circuit in Class
I, Division 2 or Class II, Division 2 locations is capable of transmitting flam-
mable atmosphere through the raceway and cable from the Division 2 location
to a non-hazardous location, it must be properly sealed at the boundary by using
of non-approved sealing fittings.
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