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Onan 7.5JB Separating T2 From Ground

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Old 10-08-2018, 08:42:34 PM
scoops scoops is offline
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Default Onan 7.5JB Separating T2 From Ground

I have a spec P Onan jb with the magneciter. The manual from the 60’s states that T2 must be connected to ground.

The current NEC states that’s if you are going to use a transfer panel that only switches the “hots” and not the neutral then you must have only one bonding point.

The dillema here is that this particular generator states that T2 must be connected to generator frame. This is most likely needed to complete the auto flashing circuit.

Yesterday I decided that after hours of studying the manual that I would go against the printed words of the manual by separating the “neutral” (T2&T3) from frame ground at the generator, and will instead rely on the connection point at the transfer panel at the neutral to ground bonding point.

By doing this will allow me to use all 4 wires (2 hots, neutral, and ground) and be in compliance with the latest NEC codes.

I realize that I may effect the longevity of the magneciter exciter and regulator by doing this, and will use this post as a means to document the ongoing tests.
I will be purchasing some power diodes and voltage control diodes in the event of a failure.
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