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David J 09-17-2018 07:00 PM

bonding ground & neutral
I purchased a Firman generator which runs and starts easly. When connected to the EMS I get error code E-9 . I think it has to do with ground. How can I fix this. Firman seems to be no help.

alano 09-22-2018 06:21 PM

You need a ground-neutral bond. Here's a link to show you how to make this plug.

uncle_bob 09-22-2018 08:21 PM


When feeding an RV you need to bond the neutral to the ground at the source ( = the generator). You also *should* do something to connect the ground to a "real ground". A spike in the ground is one way to do this, there are other possibilities.

If the generator is feeding a house through the breaker panel, this ground bond is not needed (= don't do it).


GMFL 09-22-2018 08:48 PM

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You can make yourself a homemade 30 amp Dogbone for your generator with a 30 amp plug, single gang box, cover, and a short 10ga pigtail with a 20amp plug
Wire the 30amp plug just like normal but add a short jumper wire between the ground and the neutral. This will bond the neutral outside the trailer and at the power source like it is inside the panel box/shore power supply.

Mollysdad 09-22-2018 10:34 PM

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The simplest is to make a cheater plug.
Take a plain old three prong male plug,
Run a jumper wire from the green ground to the white (silver) neutral.
Then while on generator, just plug that into any unused 120v. outlet on the generator.

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