Technicolor - Thomson POWER & CONTROL TS 870 - Manual (Page 9)

TS 870 TRANSFER SWITCH
PM062 REV 8 10/01/25 5 Thomson Technology
the supply source be arranged such that the phase of highest potential with respect
to ground is not connected to the power supply inputs to the controller (A Phase for
both supplies). Failure to do so will result in equipment damage.
Per NEC Article 384-3 (f) “The B phase shall be that phase having the higher
voltage to ground on a 3-phase, 4-wire delta connected systems.”
3.5. REMOTE START CONTACT FIELD WIRING
As a minimum, the remote engine start control field wiring shall conform to the local
regulatory authority on electrical installations. 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.
3.5.1. Minimum #14 AWG (2.5mm
2
) wire size shall be used for distances up to
100ft (30m)
1
). For distances exceeding 100 ft. (30m) consult Thomson
Technology
3.5.2. Remote start contact wires should be run in a separate conduit.
3.5.3. Avoid wiring near AC power cables to prevent pick-up of induced voltages.
3.5.4. An interposing relay may be required if field-wiring distance is excessively
long (i.e. greater than 100 feet (30m)) and/or if a remote contact has a
resistance of greater than 5.0 ohms.
3.5.5. The remote start contact must be voltage free (i.e. dry contact). The use of a
“powered” contact will damage the transfer controller.
3.6. DIELECTRIC TESTING
Do not perform any high voltage dielectric testing on the transfer switch with the TSC
80E controller connected into the circuit as serious damage will occur to the
controller. All AC control fuses and control circuit isolation plugs connected to the
TSC 80E must be removed if high voltage dielectric testing is performed on the
transfer switch.
3.7. INSTALLATION OF OPEN TYPE TRANSFER SWITCHES
Please refer to the factory for additional information.