Cummins/Onan — AC Connections
Installation · Transfer Switch Terminals
From a Cummins/Onan service manual covering: GT30160EQ5KA000, GT40063XN52A000, GT40063YN52A000, GT40063ZN52A000. Check it applies to your exact model before use.
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Before you start
- Failure to prevent the generator set from starting before wiring procedures are performed presents a shock hazard that can cause severe personal injury or death.
Procedure
- Test the operation of the generator set from its own controls.
- Stop the generator set and remove the negative lead from the cranking battery to prevent starting.
- Connect conductors of sufficient size to carry rated current from the line, load, and generator set directly to the transfer switch terminals marked A, B, and C (A, B, C, and N on 4-pole switches). Ph
- Connect power cables to the load terminals. Tighten the terminal lugs as indicated in Table 7-1.
Specs & values
- Terminal lug torques per Table 7-1
Source: Cummins/Onan 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.