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Onan Generators

Onan Generator (15KW) 15.OJC-C3R 112471AA

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Old 10-06-2015, 01:27:29 PM
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Default Re: Onan Generator (15KW) 15.OJC-C3R 112471AA

Continuity may not work unless t2 is bolted to frame. In the picture looks like t3 is bolted too t2. Hope the experts get in.
The picture is out of 900-0184 pg 40.
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Old 10-07-2015, 05:51:19 PM
Mike57 Mike57 is offline
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Default Re: Onan Generator (15KW) 15.OJC-C3R 112471AA

Sorry to come in on this thread late.

In this particular case, because your generator is the sole source of power for the structure, your bonding of the neutral to the grounding system takes place at the gen-set, just as Kpack stated in post #26. T1 and T4 are your hots. T2 and T3 tie together at the gen-set and are bonded to the generator frame. Your ground rod (or rods, or optional grounding electrodes used) are tied in at the bonding point in the generator.

Do run 4 wires (2 hots, a neutral and a ground) from the generator to the cabin.

There will be no bonding at your service panel, the grounds and neutrals will be isolated from one another.

You can run 50' to a ground rod but it's not an ideal situation. It's not a code violation to do so. The goal is to to have the grounding system at or below 25 ohms to ground. Often this takes more than one ground rod, particularly in bad soil or rocky soil. Each rod must be at least 6' apart. FYI as an example: Two ground rods are minimum in the State of Oregon because of poor soil conductivity.

You have grounding alternatives to a driven ground rod(s):

Plate electrode(s):>= 2sq.ft surface area and >= 1/4" thick buried at least 30 inches. typically this is a steel plate with a 3/4" stud welded to it in order to attach the grounding electrode conductor using a standard ground rod clamp.

Ground ring circling the building:>= 20 ft. of >= #2awg bare copper buried at least 30 inches.

You can use any combination of the above to achieve the necessary ohms to ground.

There are other grounding electrode options but these should cover you.

If you have copper pipe in the building, bond the hot to the cold at the hot water tank and carry that wire, unbroken, to the ground bar in the panel. The size of this wire is dependent on the size of your main service disconnect breaker.

Hope this helps you out.
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