Cummins/Onan — AC Wiring Methods
Installation · AC power output wiring
From a Cummins/Onan service manual covering: 5.5 HGJAA, 5.5 HGJAB, 6.5 HGJAA, 6.5 HGJAB, 7.0 HGJAA, 7.0 HGJAB. Check it applies to your exact model before use.
Applies to: Cummins/Onan HGJAA, Cummins/Onan HGJAB
Before you start
- HAZARDOUS VOLTAGE!
- IMPROPER WIRING can cause fire or electric shock.
- Faulty grounding can lead to fire and electrocution.
Procedure
- Have a qualified electrician supervise and inspect the installation of all AC wiring.
- Install vibration-proof switches and controls that won't open and close circuits when the vehicle is in motion.
- Provide ground fault circuit interrupters (GFCIs) for all convenience power receptacles.
- Route AC wiring, remote control wiring, and fuel lines separately.
- Seal all conduit openings into the vehicle interior to keep out exhaust gas.
- Bond the generator set and all connected AC and DC equipment and controls to a common grounding point.
Specs & values
- Generator set leads: 3 m (120 in) 30-A (12 AWG) XLPE UL 3173 125 °C wire, CSA CL1251
- Use 10 AWG for extension to main AC distribution panel
Full service-parts list: Cummins/Onan HGJAA →, Cummins/Onan HGJAB →
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.