Yamatake Corporation
14
ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
FM Intrinsically Safe System (in accordance with NEC and ANSI/ISA
RP 12.6)
CAUTION
• Only suitable
associated apparatus separately approved by FM (FMRC)
shall be connected to the intrinsically safe apparatus.
• Electrical equipment connected to the associated apparatus in non-hazardous
locations shall not use or generate more than 250 Vrms.
• Tampering and replacement of any components within the intrinsically safe
apparatus with non-factory components may adversely affect the safe use of the
system.
Installation requirements
1. The intrinsically safe and associated apparatus shall be installed in accordance
with
the control drawing(s)
attached.
Especially, the control drawing(s) provides guidance on determining
the maxi-
mum allowed capacitance and inductance of the interconnecting cables
.
2. The intrinsically safe and associated apparatus is permitted to be installed in any
hazardous (classified) location for which they have been approved,
by using any
of the wiring methods suitable for ordinary (unclassified) locations
, including
wiring methods for communication systems.
3.
Conductors of the intrinsically safe circuit shall not be placed in raceways,
cable trays, and cables with conductors of any non-intrinsically safe circuit,
unless
(1) the conductors of the intrinsically safe circuit are separated from these
of the non-intrinsically safe circuits by a distance of at least 50 mm, and secured or
separated by a grounded partition or an approved insulating partition; or (2) either
all of the intrinsically safe circuit conductors or all of the non-intrinsically safe cir-
cuit conductors are in grounded metal-sheathed or metal-clad cables where the
sheathing or cladding is capable of carrying fault current to ground.
4.
Different intrinsically safe circuits shall be in separate 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 thickness of 0.01 inch (0.25 mm).
5. Intrinsically safe apparatus, associated apparatus, shields of conductors or cables,
enclosures and raceways, if of metal, shall be grounded.