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 9/14/2008 4:03 PM
 
I'm going to wire in a 50 amp plug for my new fifth wheel. I have 8-3 ran for the 30 amp plug and will be removing it to wire in a 50 amp. I've done a lot of wiring, so this is mnot new to me, I just want to make sure my thinking is correct. I need a 14-50R receptical and cover.
Have 8/3 ran but need to make sure I have the green/bare ground wire.
I need a dual 50 amp. 250 volt breaker.
I have the wiring diagram in hand and see the black and red wires, each will go to one terminal of the breaker. Then one to the X and other to the Y terminal on the receptical.
White goes to the round ground terminal.
Green/bare goes to the Neutral terminal.
Now a question. The ground and neutral go to the same ground strip in my box, so if I used two ground terminals that would work for the connections for white and green/bare? Steve Zehr Miami Co. Kansas 2004 F350 Crew Cab 6.0 dsl dually, B&W Hitch 2009 Bighorn 3670RL

Steve Zehr Miami Co. Kansas 2004 F350 Crew Cab 6.0 dsl dually, B&W Hitch 2009 Bighorn 3670RL
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 9/14/2008 10:41 PM
 
I have never wired a 50 amp plug ...
I found this website very useful for wiring a 30 amp plug and there are directions for wiring both 30 and 50 amp plugs
50 Amp Plug Help[/url] Wayne and Jeanette we call our rig Ernie the Journey
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 9/14/2008 11:01 PM
 
Hey Steve...
I think that you had better check it out a little closer...
I believe that in the 4 wire cable that you described that the 'White' wire is for the Neutral and that the "Green wire" is for the "ground"..
Green is always "GROUND" in the code...
Check it out....
DD dd

dd
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 9/15/2008 12:02 AM
 
Sorry Steve: No cigar.
8-3 is only good for 40 Amps (per the NEC). To be up to code, you will need 6-3 for 50A, but the 8-3 will work, if the run is not too long.
The black and red wires go to the X and Y terminals; the white wire goes to the NEUTRAL terminal, and the green or bare wire goes to the Ground terminal.
You are correct on needing a 2-pole 50A 240V breaker.

Cheers and happy travels, Mike
www.backroadtravelers.com

Cheers and happy travels, Mike www.backroadtravelers.com
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 9/15/2008 10:37 AM
 
Am I wrong or is this actually a 100A 120V service. If you use #6 and twin 50A breakers then you are actually providing two 50A feeds as opposed to one 30A feed in a 30A service (12000W vs 3600W).
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 9/15/2008 11:44 AM
 
PARick - You're right. 50-amp service is actually two separate 50-amp 120v feeds for a total of 100 120v amps. The wiring, however, only needs to be sized for 50 amps, because the two lines are out-of-phase, meaning the current to the neutral would never exceed 50 amps, and will be less if both lines are being used...since the out-of-phase condition results in one canceling the other. This unbalanced load is also the reason it's important to size the neutral to handle 50 amps, for those situations when current is only being drawn from one of the lines. Good luck. - Dave

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 9/15/2008 1:17 PM
 
dd. Yes your right, that is what I ment. Well my run from the beaker box will be about 16-20 liner feet, can I get by with the 8/3? I doupt I will be running both AC units parked at home, but the doubt could be that I do, so I guess I'll have to spring for 6/3. ( I do have enough 8/3 to double it to the box)
The out of phase throws me off. The double breaker, does that pull from one side of the breaker buss or both? I do recall seeing breakers that pulled from both buss bars, but it's been awhile since I've delt with a 220 circuit.
I'll have to get a beaker and take a look. I'm not going to wire it with out knowing what I'm doing. May have to go up the road and see if the retired electrican is still around.
Thanks for the info, keep it coming.
Steve Zehr Miami Co. Kansas 2004 F350 Crew Cab 6.0 dsl dually, B&W Hitch 2009 Bighorn 3670RL This message was edited by SteveZehr on 9-15-08 @ 1:27 PM

Steve Zehr Miami Co. Kansas 2004 F350 Crew Cab 6.0 dsl dually, B&W Hitch 2009 Bighorn 3670RL
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 9/15/2008 2:33 PM
 
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 9/15/2008 5:13 PM
 
I think using a 50A breaker with #8 wire is exceeding the current rating for the wire and may not be completely safe. Personally, I would use either #6 wire or 40A breakers. Does anyone have an opinion on bringing in a wire from both phases as opposed to both legs from the same phase. I would rather remove any possibility of accidently hooking up 220V by using both legs from the same phase.
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 9/15/2008 5:47 PM
 
PARick - If you brought in two 120v 50-amp lines of the same phase, the common neutral would have to be able to handle the full 100 amps. That would be a very big wire (HERE).[/url] Good luck. - Dave
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