Cummins/Onan — Grounding the Generator Set
Installation · generator neutral and grounding
From a Cummins/Onan service manual covering: C400 D5e, C400D5, C450 D5e, C450 D6e, C450D5, C450D6, C500 D5e, C500 D6e, C550, C550 D5, QSX15. Check it applies to your exact model before use.
Applies to: Cummins/Onan C400 D5e, Cummins/Onan C450 D5e, Cummins/Onan C450 D6e, Cummins/Onan C450D5, Cummins/Onan C450D6, Cummins/Onan C500 D5e, Cummins/Onan C500 D6e, Cummins/Onan C550 D5, Cummins/Onan QSx15, Cummins/Onan QSX15-G8/G9 engine
Before you start
- Bonding and grounding must be done properly. All metallic parts that could become energized under abnormal conditions must be properly grounded.
Procedure
- Make sure the generator set is grounded to earth in one location only.
- On generators without a circuit breaker, ground to the point indicated on the top of the generator.
- On generator sets with circuit breakers, use the ground lug provided in the circuit breaker box.
- For a 3-pole ATS, the generator neutral is connected to the ATS and is NOT bonded to ground at the generator.
- For a 4-pole ATS system, use a grounding electrode conductor and a bonding jumper to connect the generator neutral to ground.
Full service-parts list: Cummins/Onan C400 D5e →, Cummins/Onan C450 D5e →, Cummins/Onan C450 D6e →, Cummins/Onan C450D5 →, Cummins/Onan C450D6 →, Cummins/Onan C500 D5e →, Cummins/Onan C500 D6e →, Cummins/Onan C550 D5 →, Cummins/Onan QSx15 →
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.