TP-6461 1/0818 Section 1 Scheduled Maintenance
Testing live electrical circuits. Hazardous voltage or
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Wire Insulation Breakdown Test Procedure
1. Disconnect all power sources by opening
upstream circuit breakers or switches to the
transfer switch. Disconnect the load from the
transfer switch by opening circuit breakers or
switches leading from the transfer switch.
Disconnect the transfer switch wiring harness from
the controller at connector P1.
2. Use a hi-pot tester or meggar to check the
insulation resistance phase-to-phase and phase-
to-neutral, and phase-to-ground if neutral and
ground are isolated. For a hi-pot tester, the
maximum potential is 500 VAC and the maximum
test time is 1 second.
3. Verify that the measured insulation resistance
exceeds 1.24 megohms (MΩ).
4. If the hi-pot tester indicates wire insulation
breakdown or if the measured resistance is less
than 1.24 MΩ, isolate the leakage current using an
instrument designed for this purpose. Replace the
faulty components.
Note: You may need to disconnect power
conductors from the lugs to isolate the
problem. If you disconnect the power
conductors, see transfer switch operation
and installation manual for reconnection
instructions.
Every Five Years
Check the normal and emergency source setpoint
calibration according to the procedures in Section 2.4,
System Settings.
1.4 Service Schedule
Follow the service schedule in Figure 1-4 for the
recommended service intervals. The transfer switch
operator can perform tasks marked by an X. Have an
authorized distributor/dealer inspect the switch annually
and perform all service marked by a D.
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