TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
8
2.7. EXTERNAL PANEL CONTROL WIRING
As a minimum, all control wiring shall conform to the local regulatory authority on electrical
installations. Specific wire sizes listed below are for typical circuits of distances up to 500ft
(150m)
1
, are as follows:
Utility or Generator Voltage Sensing #14 AWG (2.5mm
2
)
Transfer output signals #14 AWG (2.5mm
2
)
Remote Start Contact for Engine Controls #14 AWG (2.5mm
2
)
NOTE: For long control wire runs or noisy electrical environments the control wires
should be twisted & shielded with a suitable drain wire. The shielded cable drain wire
must be grounded at one end only. The drain wire grounding location may vary as
micro-processor controllers generally exist at both ends (engine generator set &
transfer switch) and one may be more susceptible depending on the level of induced
noise. The most susceptible controller will requiring the shield ground point as close
as possible to the controller. Wire runs from 500ft to 1000ft should be twisted and
shielded and increased to #12 AWG where total loop resistance is greater than 5
ohms.
1
For distances exceeding 1000ft. (300m) consult Thomson Technology
2.8. REMOTE START CONTACT FIELD WIRING
Field wiring of a remote start contact from a transfer switch to a control panel should conform
to the following guidelines to avoid possible controller malfunction and/or damage.
2.8.1. Remote start contact wires (2 #14 AWG (2.5mm
2
)) should be run in a separate
conduit (ferromagnetic type) and in all cases separated from any AC wiring.
2.8.2. Avoid wiring near AC power cables to prevent pick-up of induced voltages.
2.8.3. An interposing relay may be required if field-wiring distance is excessively long
(i.e. greater than 1000 feet (300m)) and/or if a remote contact has a resistance
of greater than 5.0 ohms. In extremely noisy environments, the wire run
lengths indicated may not provide reliable operation and can only be corrected
by the use of an interposing relay. The interposing relay is generally installed
at the engine controls and utilizes DC power. It is strongly suggested that the
ground return wire of the interposing relay be used for the interface to the TSC
800 remote start contact, this will ensure integrity of the DC power supply to the
engine generator set controls in the event of a shorted or grounded wire remote
start interface wire.
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