Technicolor - Thomson POWER & CONTROL TS 870 - Manual (Page 20)

TS 870 TRANSFER SWITCH
PM062 REV 8 10/01/25 16 Thomson Technology
5. Attach a safety lockout padlock to the service disconnect control switch to
prevent unauthorized change in operating condition and verify transfer switch
door is locked closed.
6. To reenergize the load, remove the padlock(s) from the service
disconnect control switch, and move the switch to the Energized position.
The transfer switch will immediately return to the utility or generator supply if
within normal operating limits.
5.3. TEST MODES
The transfer switch may be tested utilizing the TSC 80E controller push-buttons or optional
four position test switch. A simulated utility power failure condition will be activated when
the test mode is selected. The transfer switch will operate as per a normal utility power fail
condition.
The transfer switch will remain on generator supply until the test mode is terminated. It will
then immediately transfer back to the utility supply and then continue to operate the
generator set for its cooldown period then stop. Note: The transfer switch will automatically
return to the utility supply (if within nominal limits) if the generator set fails while in the test
mode.
6. OVER CURRENT PROTECTION
Thomson Technology TS 870 series of Automatic Transfer Switches may be supplied with or
without integral over current protection as described below:
6.1. STANDARD TS 870 AUTOMATIC TRANSFER SWITCH
The standard TS 870 Automatic Transfer Switch does not contain any integral over current
protection and requires upstream over current protection devices for both Utility and
Generator sources. The Standard TS 870 is rated for 100% continuous loading and can
withstand a maximum short circuit fault current as noted in Section 15 of this manual. The
standard TS 870 transfer switch model without integral over current protection is identified
in the product model code. Refer to Section 4.1 of this manual for further details on model
coding.
6.2. OPTIONAL TS 870 AUTOMATIC TRANSFER SWITCH WITH INTEGRAL
OVER CURRENT PROTECTION
TS 870 transfer switches will have integral over current protection supplied on the Utility
source as standard. The type of over current protection utilized is dependent upon ATS
amperage size and optional features specified. For transfer switches rated 100A through