17
Intrinsically safe module wiring
WARNING
: Always lock out and tag electrical circuit breakers while installing or servicing
this equipment and any related equipment. A potentially lethal electrical shock hazard and the
possibility of an explosion or fire from a spark can result if the electrical circuit breakers are
accidentally turned on during installation or servicing.
IMPORTANT:
Intrinsically safe wiring cannot be run in the same conduit as non-intrinsically safe
wiring. Conduit knockouts for IS and non-IS module wiring are shown in the illustration below. IS
modules can be identified by their blue faceplates and should always be installed to the right of
the moveable isolation barrier. IS conduits require a ground to each box.
IMPORTANT:
If local codes do not require the use of conduit, cable glands must be used at
all enclosure knock-outs. Gaps larger than 0.06 inch (1.5 mm) will violate safety approvals. Be
certain to provide adequate IS and non-IS wire separation.
Controller Module (CM)
Power Supply Module (PS)
Non-IS
Modules (red)
IS Modules (blue)
Isolation Barrier
(TS-5000 evo
front view with cover removed)
TM
FFS recommends that each run of IS wiring not exceed 1500 feet (450 m) using any 2-conductor
shielded cable or the cables/wires recommended in the Standard Installation Materials chapter. If
you are not using the recommended cables/wires as set out in the Standard Installation Materials
chapter or need to run wiring beyond 1500 feet (450 m), then please contact Technical Support.
The IS modules in the ATGs were certified as associated apparatuses using the “Entity Concept.”
Under this concept, the IS apparatus (field device) has assigned parameters which, when properly
matched to those of an associated apparatus, will constitute an intrinsically safe system. If there
are none available however, values of 60 pF/foot (200 pF/m) for capacitance per wire pair and
0.2 u
H/foot (0.7
u
H/m) for inductance may be used. Refer to the associated apparatus’s control
drawing for acceptable cable run length calculations.
Summary of Contents for KWIK TRIP EVO 5000
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