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Thread: 50 amp 3 pole 4 wire service?
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09-25-2012, 03:52 PM #1
50 amp 3 pole 4 wire service?
Needing to wire service for an RV. Uses a "50 amp 120/240-volt 3pole 4 wire grounding service" hook up. Wiring to a 70 amp breaker box directly below a meter base on a temp pole set up. Will be running wire about 40 ft. underground to four pole plug in a metal box, which is where cord for trailer will plug into. Breaker box has a common ground/neutral buss bar, not seperate ones. My question is, Seeing as the ground and neutral are common in the breaker box, could I run just an encased 4/3 cable to the plug box and then jumper the ground and neutral wires at the plug intead of getting another wire to run along side the encased wires? They will be coming off the same buss in the breaker box anyway, why get the extra wire? Or do I need to get another breaker box, with a seperate ground and neutral buss ( which will more than likely be bonded in the breaker box )?
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09-25-2012, 04:47 PM #2
Re: 50 amp 3 pole 4 wire service?
No offense Tony but if you have to ask those questions, you really should hire an electrician. RV service looks simple but can be deadly.
But no, you cannot omit the 4th wire. There is a separate ground / neutral for a reason.
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09-25-2012, 05:11 PM #3
Re: 50 amp 3 pole 4 wire service?
So Jim, I need to get another breaker/service panel with a seperate grounding bus????
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09-25-2012, 05:16 PM #4
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09-25-2012, 07:05 PM #5
Re: 50 amp 3 pole 4 wire service?
Maybe I'm not understanding your description, but I question your whole installation. For 120 you need a neutral, and for 240 you need 2 hots; is the 3rd wire your neutral? So where is your ground? And an additional isolated ground (or grounding rod)is most likely required.
Even if you supply the labor to dig the trench, it sure makes sense to have a real electrician oversee the install and make the connections.
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09-26-2012, 03:42 AM #6
Re: 50 amp 3 pole 4 wire service?
A branch circuit does not require a ground rod or grounding electrode system.
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09-26-2012, 04:07 AM #7
Re: 50 amp 3 pole 4 wire service?
As long as you have a grounding conductor present and properly connected in the cable going to the RV no ground rod is required. If a generator is included in the mix it may be required. See: http://www.osha.gov/OshDoc/data_Hurr..._generator.pdf
Texas Inspector
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09-26-2012, 05:38 AM #8
Re: 50 amp 3 pole 4 wire service?
Does the 70 Amp breaker being fed on the pole need a grounding electrode? As far as the metal box housing the 4 prong outlet being fed from 40' away underground, I always thought when running a feeder underground to a remote location, like a garage or satellite dish, Etc. you need a grounding system.
Does he not need the 4th conductor? He is talking about using a neutral as a ground to eliminate a 4th conductor.
Last edited by Steven Turetsky; 09-26-2012 at 06:09 AM.
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09-26-2012, 05:59 AM #9
Re: 50 amp 3 pole 4 wire service?
You can't use a 70 Amp breaker with a 50 Amp receptacle in the first place......
Like the others, I recommend you hire a competent electrician.
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09-26-2012, 11:52 AM #10
Re: 50 amp 3 pole 4 wire service?
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09-26-2012, 11:53 AM #11
Re: 50 amp 3 pole 4 wire service?
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09-26-2012, 12:04 PM #12
Re: 50 amp 3 pole 4 wire service?
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09-27-2012, 08:19 PM #13
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