TS 970 Transfer Switch
PM163 REV 0 20/02/05 6 Thomson Power Systems
3.9. WITHSTAND/INTERRUPTING CURRENT RATINGS
Refer to electrical ratings shown in SECTION 11 for withstand/Interrupting current ratings.
Short circuit currents listed for Standard type ATS are withstand ratings.
3.10. TRANSFER SWITCHES WITH MULTI-TAP VOLTAGE CAPABILITY
If the transfer switch has programmable multi-tap voltage capability (i.e. ATS Model Code with
Voltage Code “Y”), confirm the transfer switch has been configured for the correct system
voltage prior to installation.
WARNING
Failure to confirm and match transfer
switch voltage with the system voltage
could cause serious equipment damage.
The voltage selections and connections are shown on the drawings supplied with each transfer
switch. The factory default settings will be indicated on the calibration label attached on the
inside of the enclosure door. A blank label is included to record the applicable settings if the
configuration is changed from the factory default settings.
To change the transfer switch voltage, refer to TS 970 System Voltage Change Procedure,
Appendix B. Contact Thomson Power Systems for further information as may be required.
3.11. 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.
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 Power Systems
• Remote start contact wires should be run in a separate conduit.
• Avoid wiring near AC power cables to prevent pick-up of induced voltages.
• 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.
• The remote start contact must be voltage free (i.e. dry contact). The use of a
powered contact will damage the transfer controller.
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