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Old 01-27-2012, 07:41 PM   #1
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Default Wild leg

So I have a 3 phase 120/208 service...so I thought, meter is tag that after looking further they changed the utility x-former and I have 120/240 with c phase being 215 volts to ground A n B r about 250 volts phase to phase my question is can u use that wild leg or what's your guys experience with it, I have never came across this

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Old 01-27-2012, 07:44 PM   #2
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Originally Posted by Clintmiljavac View Post
So I have a 3 phase 120/208 service...so I thought, meter is tag that after looking further they changed the utility x-former and I have 120/240 with c phase being 215 volts to ground A n B r about 250 volts phase to phase my question is can u use that wild leg or what's your guys experience with it, I have never came across this

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sounds like a 208 high leg, but it's usually B phase..ur wires marked right?

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Old 01-27-2012, 07:46 PM   #3
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Originally Posted by Clintmiljavac View Post
So I have a 3 phase 120/208 service...so I thought, meter is tag that after looking further they changed the utility x-former and I have 120/240 with c phase being 215 volts to ground A n B r about 250 volts phase to phase my question is can u use that wild leg or what's your guys experience with it, I have never came across this

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Yeah, you can use the wild leg. Just not with a single pole breaker.
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Old 01-27-2012, 07:46 PM   #4
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No they were tagged blk red blue in panel and disco I found this out with my meter when checking voltage. Im gonna re-tag Monday

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Old 01-27-2012, 07:47 PM   #5
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sounds like a 208 high leg, but it's usually B phase..ur wires marked right?

Around here, It's supposed to be C phase at the meter
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Old 01-27-2012, 07:48 PM   #6
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Around here, It's supposed to be C phase at the meter
poco rules?
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Old 01-27-2012, 07:48 PM   #7
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Yeah, you can use the wild leg. Just not with a single pole breaker.
Y not a single pole breaker?

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Old 01-27-2012, 07:48 PM   #8
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I hope you didn't have any 120 Volt loads connected to that leg when they changed up the transformer ...
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Old 01-27-2012, 07:48 PM   #9
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No they were tagged blk red blue in panel and disco I found this out with my meter when checking voltage. Im gonna re-tag Monday

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ohm out your wires,too
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Old 01-27-2012, 07:50 PM   #10
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poco rules?

Yep. C phase at meter, and B phase at service
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Old 01-27-2012, 07:51 PM   #11
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I hope you didn't have any 120 Volt loads connected to that leg when they changed up the transformer ...
Did but they were a multi-tap ballast on lights

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Old 01-27-2012, 07:52 PM   #12
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Around here, It's supposed to be C phase at the meter
Out in Orlando they use the B phase. South of the state they use Cphase.
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Old 01-27-2012, 07:53 PM   #13
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I hope you didn't have any 120 Volt loads connected to that leg when they changed up the transformer ...
Oh yeah
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Old 01-27-2012, 07:53 PM   #14
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So should I just not use c phase at all or if it's a 2 pole breaker for a furnace or so it's ok ?

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Old 01-27-2012, 07:56 PM   #15
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So should I just not use c phase at all or if it's a 2 pole breaker for a furnace or so it's ok ?

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You need to land it on b phase and identify it purple. Then use it for 2 and 3 polle breakers. No singles on the high leg.
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Old 01-27-2012, 08:06 PM   #16
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You need to land it on b phase and identify it purple. Then use it for 2 and 3 polle breakers. No singles on the high leg.
purple? code is orange at panel...right?
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Old 01-27-2012, 08:08 PM   #17
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You need to land it on b phase and identify it purple. Then use it for 2 and 3 polle breakers. No singles on the high leg.
Thanks mcclary. I thought u mark it with orange phase tape, some reason I remember that in the 2005 code book ?

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Old 01-27-2012, 08:10 PM   #18
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yeah purple is...weird.
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Old 01-27-2012, 08:22 PM   #19
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yeah purple is...weird.

Yeah, I see purple alot here, but the code does say Orange.
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Old 01-27-2012, 08:34 PM   #20
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Did but they were a multi-tap ballast on lights

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Even though your ballasts were multi-tap, you still can't use the wild leg for 1 pole service to them, the phase-to-neutral voltage is invalid, there is no reference to ground in that circuit so that voltage would float with repect to it. Could be 208, could be 215, could be 220. That's why, when you buy a 120/240V 3 phase 4 wire breaker panel, it doesn't allow you to plug in 1 pole breakers onto the high leg, it's potentially dangerous.

Very odd that the PoCo would chage you like that, I think it technically puts you into a code violation if you are still using the 120/208V 3 phase 4 wire panels, because they will not restrict you (or someone later) from attaching a single pole breaker on that high leg.

Re: C phase vs B phase. There is no universal rule for the PoCos, they can connect it to C or B, especially in legacy systems. But the CODE says that you have to connect it at the PANEL to B phase. Only. And mark it orange there. Doesn't matter what the PoCo did going into the meter, that's their business and they are not goverened by the NEC.

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