Kohler MPAC 1500 — Wire Insulation Breakdown Test Procedure
Maintenance · Transfer switch wiring
For the Kohler MPAC 1500, from the Kohler service manual.
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Before you start
- Do not perform dielectric testing on the equipment with control components in the circuit.
- Hazardous voltage. Only authorized personnel should open the enclosure.
Procedure
- Disconnect all power sources by performing the service disconnect procedure; disconnect the load and disconnect the transfer switch wiring harness from the controller at connector P1.
- Disconnect the controller components using the control circuit isolation procedure.
- Use a hi-pot tester or megger to check 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.
- Verify that the measured insulation resistance exceeds 1.24 megohms (MΩ).
- If insulation breakdown is indicated or resistance is less than 1.24 MΩ, isolate the leakage current and replace the faulty components.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum hi-pot potential 500 VAC, maximum test time 1 second
- Minimum insulation resistance 1.24 MΩ
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.