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Old 02-03-2017, 06:11 AM   #1
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Default Mr Highleg expert buys new AC and ballasts

We changed a panelboard the other day and I didnt notice one of the breakers was on the high leg.
I custom ordered a 3 phase Delta panelboard with two single phase breakers and two three phase breakers.
They ship them out setup with the high leg on B phase.
I noticed the 100 amp two pole breaker was factory installed on A and B phase. I couldn't easily see how the 150 amp 2 pole breaker was connected, it was late in the afternoon and getting dark.
The entire building had the hi-leg on C phase so, I said screw it, they must have shipped it out wrong, High Leg on C phase, and installed it.
I turned everything back on and we left.
The next morning I get a call.
Small window shaker was not working, 4 strip lights not working.
The 150amp breaker was on the bus with A and C.

Well screw me for not checking.
The bus fingers arrived overnight from Siemens.
We go in this morning to "correct" MY mistake.

Always be on the look out for that High leg folks!
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Old 02-03-2017, 06:48 AM   #2
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High legs suck.....~CS~
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Old 02-03-2017, 08:33 AM   #3
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I'm not understanding what actually happened wrong...?
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Old 02-03-2017, 08:38 AM   #4
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He changed the H-leg configuration , didn't work out well ~CS~
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Old 02-03-2017, 08:39 AM   #5
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I'm not understanding what actually happened wrong...?
High leg on a phase Sunny didn't anticipate and he fried a few things. Notably a window ac and some ballasts.

He should have checked voltage on the breakers before connecting loads.

Sunny's attempt at being humble sharing his blunder.
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Old 02-03-2017, 08:41 AM   #6
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How is there a high leg issue with a 2-pole breaker?
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Old 02-03-2017, 08:42 AM   #7
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How is there a high leg issue with a 2-pole breaker?
Hmm?
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Old 02-03-2017, 08:44 AM   #8
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Depends on which two phases it's on.
Why?
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Old 02-03-2017, 08:46 AM   #9
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Some 2P's might be a multiwire w/noodle Hax.....~CS~
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Old 02-03-2017, 08:48 AM   #10
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Why?
My first thought was a brain fart, I changed my mind after.
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Old 02-03-2017, 08:48 AM   #11
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How is there a high leg issue with a 2-pole breaker?
I'd say it was feeding a subpanel.
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Old 02-03-2017, 08:49 AM   #12
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Some 2P's might be a multiwire w/noodle Hax.....~CS~
Oh. I see.

When he mentioned only 2 and 3 pole breakers, I figured this was going to be a panel they used for 208V only.
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Old 02-03-2017, 08:49 AM   #13
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Some 2P's might be a multiwire w/noodle Hax.....~CS~
That would be one hell of a MWBC on a 150amp breaker!
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Old 02-03-2017, 08:49 AM   #14
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I'd say it was feeding a subpanel.
Ok, another good explanation.
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Old 02-03-2017, 08:50 AM   #15
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Ok, another good explanation.
Or the only one.
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Old 02-03-2017, 08:59 AM   #16
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The utility brings the high leg in on C due to how the meters work.

How is a delta panel different than any other 3-phase panel? Literally every 3-phase 250 volt panel I have ever seen was listed for use on a 4-wire delta.
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Old 02-03-2017, 09:58 AM   #17
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Tough break, Bro! You ain't the first and won't be the last. Still sucks!
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Old 02-03-2017, 01:44 PM   #18
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Thanks for your candor.

When I was new with the company we did an overnight service change that included three panel replacements. Crew A in the daytime labeled conductors and removed three panel. Crew B installed new panels and relapsed everything. I was on crew B but being the new guy I just shut up and did what I was told like a good helper. So I wasn't thinking about it but we just slammed the panels in an wired everything. Hi leg of course fried a bunch stuff. Crew leader A and crew leader B blamed each other, one for not communicating the other for not checking. I figure it was everyone's fault. For over a decade the hi leg subject would come up and start them arguing all over again.

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Old 02-03-2017, 01:46 PM   #19
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408.3(e)
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Old 02-03-2017, 01:56 PM   #20
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No high legs in NYC. PHEW! Dodged that bullet...
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