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Old 04-15-2019, 02:32 PM   #1
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Default Distance Between Outlets on Different Phases

Are there rules or guidelines on residential outlets (120V) for keeping a single phase in a room or keeping outlets that are on opposite phases at a distance where an average person couldn't be exposed to the 240v across both phases within their reaching distance?

I tried searching but I'm sure I'm not using the professional terminology for what I'm trying to ask.
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Old 04-15-2019, 02:52 PM   #2
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240V is single phase. It is not plural.
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Old 04-15-2019, 03:04 PM   #3
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Considering a normal duplex receptacle can be split with an air gap of about 1/8” between “phases”, I say you’re good to go with an 1/8” between outlets. Is that enough?
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Old 04-15-2019, 03:17 PM   #4
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Electrical engineer everyone. You saw it here...
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Old 04-15-2019, 03:22 PM   #5
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Considering a normal duplex receptacle can be split with an air gap of about 1/8” between “phases”, I say you’re good to go with an 1/8” between outlets. Is that enough?
I hope you didn't measure that with a metal tape

When this thread gets closed, OP will be battin' a 1000
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Old 04-15-2019, 03:23 PM   #6
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Old 04-15-2019, 04:05 PM   #7
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Quote:
Originally Posted by geobrick View Post
Are there rules or guidelines on residential outlets (120V) for keeping a single phase in a room or keeping outlets that are on opposite phases at a distance where an average person couldn't be exposed to the 240v across both phases within their reaching distance?

I tried searching but I'm sure I'm not using the professional terminology for what I'm trying to ask.

Wha da fuq? Article 210 of the NEC, go learn it, love it, live it. I understand you're an electrical engineer...so how do you call out the circuits for said room if you don't understand phasing and distance?



*Not trying to be an ass, seriously trying to help you out and inquiring.
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Old 04-15-2019, 04:15 PM   #8
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240V is single phase. It is not plural.
I suppose the 240v is a single phase but when measured to the center tap of the transformer, aren't the two 120v 'halves' 180 deg out of phase?
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Old 04-15-2019, 04:21 PM   #9
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I suppose the 240v is a single phase but when measured to the center tap of the transformer, aren't the two 120v 'halves' 180 deg out of phase?
No, it’s an Edison 3 wire.
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Old 04-15-2019, 04:37 PM   #10
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Wha da fuq? Article 210 of the NEC, go learn it, love it, live it. I understand you're an electrical engineer...so how do you call out the circuits for said room if you don't understand phasing and distance?

*Not trying to be an ass, seriously trying to help you out and inquiring.
Thanks. I'll take a look at the Article.
I know I'm posting to a professional's forum so the jabs are expected. As far as "Not trying to be an ass" goes, you have to be pretty good at something to do it without trying.
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Old 04-15-2019, 04:38 PM   #11
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No, it’s an Edison 3 wire.
Got it. Thanks
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Old 04-15-2019, 04:40 PM   #12
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OP is possibly an engineer trainee in which case he needs to ask his boss or hire an electrician depending on the situation.
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Old 04-15-2019, 04:51 PM   #13
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This is the same guy who groups homeruns (1,2,3) and (8,9,10...)
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Old 04-15-2019, 04:54 PM   #14
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This is the same guy who groups homeruns (1,2,3) and (8,9,10...)
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Old 04-15-2019, 05:23 PM   #15
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Considering a normal duplex receptacle can be split with an air gap of about 1/8” between “phases”, I say you’re good to go with an 1/8” between outlets. Is that enough?
I get what your point is but my question isn't whether the 220/240 can be within same outlet or junction box. My question is more about; Lets say someone has a metal toaster oven and a metal hotplate that are plugged into separate outlets on separate circuits (each using a different hot side of the 3 wire Edison configuration).
Now say the unlikely situation occurs where both appliances fail where the hot line is shorted to its metal case. This would create a dangerous situation that could be prevented if there were some restriction on where you can put outlets that are on a different legs of the 3 wire feed. I'm not saying I want there to be a restriction or that it's even warranted in this case. I just wanted to know if there were any restriction. Seems the answer is no. I'll look at article 210 to see what it says on this subject.
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Old 04-15-2019, 05:27 PM   #16
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Electrical engineer everyone. You saw it here...
Did my profile give it away or was it the words I used in my post? I'll either have to change my profile or hang out with more electricians.
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Old 04-15-2019, 05:32 PM   #17
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This is the same guy who groups homeruns (1,2,3) and (8,9,10...)
That one is over my head. My only reply is I wish I could group my homeruns but I've never hit one in my life (though I'm sure I've given up a few).
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Old 04-15-2019, 06:30 PM   #18
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Curious why you appear to see 240V as dangerous to touch but 120V as fine. Am I reading you correctly?
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Old 04-15-2019, 07:06 PM   #19
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Curious why you appear to see 240V as dangerous to touch but 120V as fine. Am I reading you correctly?
You are reading me correctly but in the scenario I posted earlier, there would be 0v between the cases of the toaster oven and hotplate if they were on the same circuit. But if they were plugged in to outlets on separate sides of the 3 wire feed, there would be 240v between the cases. So in this case I've comparing 0v to 240v.

While I'm sure either can kill, my understanding is that in an apples to apples situation, 240v would be able to support a higher current through the 'load' but I really haven't researched that. Based on your question I assume you're saying I shouldn't assume 240v is more dangerous?
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Old 04-15-2019, 08:16 PM   #20
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Which is precisely why, before fixing a snack, I suit up with the proper PPE. The risk of an arc blast in the modern kitchen is just too great to take shortcuts.
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