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Old 03-03-2010, 06:08 PM   #1
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Dryer circuit 4-wire question


I am wiring a dryer circuit with a 10-3 wire running out to the main service disconnect panel. The plug at the wall end is a typical 4-plug receptacle. My question is, at the service panel there are additional slots for breakers, a grounding bar, but no neutral bus bar. There is only a grounding bus bar that is bonded to the neutral wire.

I have hooked up the red and black wire to the two poles on the 30 amp breaker and the white and ground wire to the grounding bus.

My problem is that there is only power to one of the hot wires at the dryer receptacle. The red has power, but the black does not.

What am I missing here??? I know there should be a neutral grounding bus, but at the main service disconnect panel there isn't.

Any info would be greatly appreciated.

-Pat
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Old 03-03-2010, 06:19 PM   #2
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Dryer circuit 4-wire question


At the Main panel the neutrals & grounds can be mixed
Sub-panels they are kept seperate

Are you sure the breaker is in the correct position ?
What Mfg panel & breaker ?
And that the wire does not have a break in it ?
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Old 03-03-2010, 06:21 PM   #3
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Dryer circuit 4-wire question


in the main service panel, the ground and neutral bars can be one and the same. Since the grounds (EGC's and GEC's) and the neutrals area all bonded together at that panel.


the neutral must be under a terminal by itself. The EGC can be doubled if the terminal is rated for it.


If you do not have power on one of the legs, you need to check the two pole breaker they are connected to in the panel. You should get 120 to ground for each of the legs and 240 from leg to leg.
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Old 03-03-2010, 06:38 PM   #4
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Dryer circuit 4-wire question


The wire has no breaks. The breaker is installed correctly. I need to get a voltmeter, as I only have a YES/NO voltage tester at the moment. So I only know if there is juice or isn't.

Good to know the neutral/ground can be bonded in the service disconnect panel. They both feed into the same bus bar.

It's a square D 200 amp service panel with 8 spaces/16 circuits, 4 of the breakers compromise the service disconnect.
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Old 03-03-2010, 06:45 PM   #5
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Originally Posted by firemanpato View Post
4 of the breakers compromise the service disconnect.
4 of the breakers or 1- 2 pole breaker that takes up 4 spaces?

old split bus panels had 2 two pole breakers that served as the main but unless this is a split bus panel, there should only be 1 2 pole main breaker.
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Old 03-03-2010, 08:15 PM   #6
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Dryer circuit 4-wire question


Nope, it's 4 breakers. I believe it's 4 single pole breakers, but I'm not at my house at the moment to check.

It's brand new construction. My electrician bailed, so I'm trying to troubleshoot. I have basic electrical experience, but nothing dealing with main panels/service disconnect
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Old 03-03-2010, 08:26 PM   #7
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Dryer circuit 4-wire question


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Originally Posted by firemanpato View Post
Nope, it's 4 breakers. I believe it's 4 single pole breakers, but I'm not at my house at the moment to check.

It's brand new construction. My electrician bailed, so I'm trying to troubleshoot. I have basic electrical experience, but nothing dealing with main panels/service disconnect
well, you have a problem with your mains then. While you can have up to 6 breakers as a main disconnect, you still need 2 pole breakers to disconnect both hot legs simultaneously.

and since this is brand new, it is not a split bus. If this is the only panel in the building, you have a problem happening in that panel.
when you get a chance, check it out because it definitely does not sound right.
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Old 03-03-2010, 08:33 PM   #8
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Dryer circuit 4-wire question


Post a picture of the breaker panel
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Old 03-04-2010, 06:23 AM   #9
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Dryer circuit 4-wire question


A 200 amp panel with 8/16 spaces does not sound correct to me.
Is this a meter main panel on the outside?
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Old 03-04-2010, 10:26 AM   #10
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Dryer circuit 4-wire question


Yes it is a meter main panel on the exterior of the home. The electrician ran the 10-3 wire to the exterior panel because it was about a 30' shorter run of cable.

I'll post pictures as soon as I can.
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Old 03-05-2010, 05:24 PM   #11
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UPDATE:

So I finally made it home to troubleshoot the outlet.

Turns out the breaker in the panel was bad (Brand new from Home-Depot.....grrrrrrrr)

I swapped out the breaker and it works wonderfully now.

Thanks Nap and Scuba_Dave for the help.

-Pato
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Old 03-05-2010, 05:44 PM   #12
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Dryer circuit 4-wire question


Glad to hear it was something kinda simple, pita, but simple.
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