Franklin Fueling Systems TS 550 evo Fuel Management System Installation - Manual (Page 19)

19
Intrinsically Safe Module Wiring
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 clearly identified in
Figure 6 on page 10 for your reference.
IS modules can be identified by their blue
faceplates and should always be installed to
the right of the moveable isolation barrier.
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.
Franklin Fueling Systems 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 TS-550 evo console 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
uH / foot (0.7 uH / m) for inductance may be used. Refer to
the associated apparatus’s control drawing for acceptable
cable run length calculations.
The 3WSNS has also been evaluated using the “System
Concept” for the specific sensors indicated on page 21.
When these sensors are used, cable must be limited to
1500 feet.
Associated apparatus parameter types and how they can be
compared to IS apparatus parameter values are shown in
the table below.
Parameter Associated
Apparatus
Comparison IS
Device
Maximum Voltage Uo < Ui
Maximum Current Io < li
Maximum Power Po < Pi
Total unprotected
capacitance
Co > Ci + Cc
Total unprotected
inductance
Lo > Li + Lc
Standard Terms
Term Definition
Uo Maximum Output Voltage
Ui Maximum Input Voltage
Io Maximum Output Current
Ii Maximum Input Current
Po Maximum Output Power
Pi Maximum Input Power
Co Maximum External Capacitance
Ci Maximum Internal Capacitance
Cc Cable Capacitance
Lo Maximum External Inductance
Li Maximum Internal Inductance
Lc Cable Inductance
Danger