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Odd configuration?

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DeWitt, Mi
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[#1] Posted: 06/15/2011 - 07:45:11 AM
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I found a 220v double 15amp breaker in panel (15+15 = 30amp)
toggles factory fastened with metal clip.

top lug connected to red wire
bottom lug connected to black wire
single neutral and ground wire leaving panel with red and black

duplex outlet under kitchen sink
top of outlet connected to black wire and neutral white
ground connected

bottom of outlet connected to red wire and common ground, and seperate white.

bottom used for plug and cord to disposer
top used for plug and cord to dishwasher

no photos, new construction, muni inspected, the folks are not happy when I told them I have never seen this.

Anyone see this on a regular basis?


Les
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Rochester, New York
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Odd configuration?
[#2] Posted: 06/15/2011 - 08:43:55 AM
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The separate neutral thing is rather unnerving; are you sure it wasn't pigtailed?


Other than that, I see multiwire branch circuits serving the dishwasher and disposal all the time.

Chad Fabry
StructureSmart Home Inspection Rochester, NY
www.structuresmart.com
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Kenmore, WA
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Odd configuration?
[#3] Posted: 06/15/2011 - 08:53:42 AM
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Yeah,

Sounds like a 15-amp MWBC to me. Like Chad says, I bet that 'separate' white is pigtailed back in the box. See disposals and dishwashers on the same MWBC all the time.

ONE TEAM - ONE FIGHT!!!

Mike

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DeWitt, Mi
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Odd configuration?
[#4] Posted: 06/15/2011 - 09:03:12 AM
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so the single throw will disconnect both? Wht is likely pigtailed. this is a condo sub panel, main is at meter three floors below.

Les
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Victoria, British Columbia
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Odd configuration?
[#5] Posted: 06/15/2011 - 09:57:48 AM
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Up until recently, all Canadian counter outlets were wired that way - 15 amp split duplex*.
The tab on the hot side of the receptacle is snapped off to separate the top from the bottom. On the neutral side of the receptacle, the tab is left in place, so one neutral connection supplies top and bottom.
Les, since each leg supplies only one receptacle, you have two 120 volt, 15 amp supplies there. They are tied together to reduce the chance of a shock, safety issue for Sparky.

The new rules (CEC 2006) allow 20 amp so that people can have unsplit GFCI outlets around the sink.

www.allsafehome.ca
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DeWitt, Mi
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Odd configuration?
[#6] Posted: 06/15/2011 - 12:40:13 PM
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Thanks John, guess I knew that, but in this area we have not seen the breakers tied together at the panel
thanks guys!

Les
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Newberg, OR
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Odd configuration?
[#7] Posted: 06/15/2011 - 12:57:33 PM
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Quote: Thanks John, guess I knew that, but in this area we have not seen the breakers tied together at the panel
thanks guys!



Hasn't it been an NEC requirement for years? Of course, I don't know what code MI falls under.


Brandon

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Odd configuration?
[#8] Posted: 06/15/2011 - 1:33:31 PM
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A double pole 15 is not a 30 amp breaker. It is a 15 amp breaker.

There should have been no reason to break the tab on the neutral side.

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DeWitt, Mi
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Odd configuration?
[#9] Posted: 06/15/2011 - 3:18:09 PM
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Quote: Originally posted by Jim Port

A double pole 15 is not a 30 amp breaker. It is a 15 amp breaker.

There should have been no reason to break the tab on the neutral side.

agreed!

Les
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Gaston, Oregon
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Odd configuration?
[#10] Posted: 06/15/2011 - 5:10:16 PM
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Quote: Originally posted by Les

Thanks John, guess I knew that, but in this area we have not seen the breakers tied together at the panel
thanks guys!



That's because it wasn't required until the 2008 NEC. Before that, the breakers didn't need a tie bar. Without a tie bar, it wouldn't have shown up on your radar.

Jim Katen, Oregon
www.amipdx.com
   
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