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09-05-2017, 09:23 PM
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#1
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Senior Member
Join Date: Oct 2011
Location: Central, SC
Posts: 759
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How to wire shore power panel
I have wired a 100 Amp sub panel with 3 30amp double pole breakers and 1 30 amp single pole breaker. I have 3- 50 amp RV plugs and 1- 30 amp RV plug.
The double pole breakers are 2 on one side and 1 on the other side of the panel.
Here is my concern. I have each breaker wired identically so that if everyone were to plug in 50 amp to 30 amp adapters I believe that they will all be drawing off the same bus of the panel.
Should I swap location of the load for one of the double pole breakers so as to get a more balanced load on the neutral, as well as both legs of the shore power?
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09-05-2017, 09:31 PM
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#2
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Senior Member
Join Date: Oct 2010
Posts: 243
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So, you have a 2-pole 30 amp breaker feeding a 50 amp plug?
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2004 Fleetwood Excursion 39S
2015 Jeep Wrangler Unlimited Rubicon Hard Rock
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09-05-2017, 10:21 PM
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#3
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Senior Member
Join Date: Nov 2015
Posts: 26,810
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Power panel should already be split into 2 busses
Every other CB slot is on same buss
SO 1,3,5 etc would be hot from one buss and 2,4,6 etc would be hot from other buss
But as posted above......
You have a 30A breaker feeding a 50A RV Plug?
30A is 1 Hot, 1 Neutral, 1 Ground
50A is 2 Hots, 1 Neutral, 1 Ground
You are feeding subpanel from main panel with 2 hots........correct?
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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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09-05-2017, 11:16 PM
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#4
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Oct 2009
Location: E WA or S TX
Posts: 4,057
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Max you can draw from 1 leg is 100 Amp. Neutral should be same size as each leg, do not downsize. 50 Amp RVs do not draw equal power on both legs, and with only 30 Amp available on each leg there is no way to calculate neutral currents, so plan for the max. 100 Amps for main and 30 Amps to RVs. IMHO. There is no problem under powering the 50 Amp receptacle, you just limit the load. RVs seldom use 12,000 watts.
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04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat(RIP) 01 Z3
Life is a Timed Event, you only get One Go Around!
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09-06-2017, 05:07 AM
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#5
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Senior Member
Join Date: Aug 2017
Posts: 235
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Hire an electrician
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09-06-2017, 05:48 AM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 35,413
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I follow what your saying, but what your asking, assumes that ALL 50 to 30 amp adaptors tap the same leg.
Have you confirmed that ?
You could build your own adaptors, tapping the X leg on some and the Y leg on others.
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09-06-2017, 05:49 AM
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#7
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Senior Member
Join Date: Oct 2012
Posts: 458
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Quote:
Originally Posted by ej1144
hire an electrician
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big x 2!
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09-06-2017, 06:08 AM
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#8
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Senior Member
Join Date: Oct 2015
Location: Brighton, MI
Posts: 775
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If 2 breakers on the left using the top 4 slots and 1 double pole, top 2 slots, and 1 single, 3rd slot, then you're as balanced as you can get. This assumes, as you said, that all breakers and outlets are wired the same AND all 30 amp adapters use the same hot leg. In that case the left side breakers will supply all power from either buss 1 or 2 and the right side will supply power from the opposite buss.
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Hank & Lynda
2003 Winnebago Adventurer 35U, Workhorse W22
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09-06-2017, 06:30 AM
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#9
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,767
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Quote:
Originally Posted by Lovin2Camp
big x 2!
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Agree, that's the safest way to tackle this issue.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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09-06-2017, 06:42 AM
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#10
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Senior Member
Join Date: Jun 2017
Posts: 2,807
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The OP obviously has a handle on what he is doing and doesn't need to hire an electrician. He was just concerned about unbalanced loads on the two hot legs to the sub-panel.
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09-06-2017, 06:50 AM
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#11
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Senior Member
Join Date: Oct 2011
Location: Central, SC
Posts: 759
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Quote:
Originally Posted by twinboat
I follow what your saying, but what your asking, assumes that ALL 50 to 30 amp adaptors tap the same leg.
Have you confirmed that ?
You could build your own adaptors, tapping the X leg on some and the Y leg on others.
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You got my point exactly. I have no way of knowing if all adapters tap the same leg. If they do then I could get unbalanced load assuming every 50 amp plug had an adapter hooked up.
I guess I should swap one pair of hots to lessen the possibility of all the load being on one leg.
I guess camp grounds use a method of supplying a 30 and 50 plug and alternating which leg hooks to the 30 amp plugs are able to control the load balancing. My minimal OCD wired every breaker and plug identical so that they all ended up on the same buss.
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09-06-2017, 07:05 AM
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#12
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Senior Member
Join Date: Aug 2017
Posts: 235
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All righty then
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09-06-2017, 07:09 AM
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#13
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Senior Member
Join Date: Aug 2017
Posts: 235
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Quote:
Originally Posted by ej1144
All righty then
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Where's you conduit supports
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09-06-2017, 04:54 PM
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#14
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Senior Member
Join Date: Jul 2015
Location: Athol, Id
Posts: 126
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Quote:
Originally Posted by ej1144
Hire an electrician
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X2222
If you have to ask your not qualified !!!!!!!!!!!!!!!!!11.
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2008 Dutch Star 4035
Retired IBEW Local 595
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