Troubleshoot This

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480sparky

480sparky

Senior Member
Location
Iowegia
Here's a problem I once came upon many presidents ago:

200a 1-ph resi panel. HO complained about dim lights and ceiling fans running slow. I immediately suspected an open neutral in the service, so I opened the panel and took some voltage readings.

On the main lines coming in, I had 242.3V L1-L2.
L1 to ground, 121.5
L2 to ground, 121.3.

So far so good.

But these are the voltages to ground I found in the rest of the panel:

TroubleshootThis.jpg


All neutral connections were solid and tight in the neutral bar. 2-pole breakers are highlighted in green. Readings are taken between the breaker terminal and ground.


Anyone wanna take a stab at what I found?
 
electricalperson

electricalperson

Senior Member
Location
massachusetts
stickboy1375 said:
missing hot leg, backfeeding through the 2 pole breakers.
Click to expand...
your a genius. ever see this before? i had that problem on a panel before. the light would flicker a little bit and had weird voltage readings in the panel. turns out the problem was the insulating piercing connector someone used to connect the service at the top
 
480sparky

480sparky

Senior Member
Location
Iowegia
stickboy1375 said:
missing hot leg, backfeeding through the 2 pole breakers.
Click to expand...
No, had good, consistent voltage at the main breaker.
winnie said:
Someone reuse a 3 phase panel?

-Jon
Click to expand...
No, it only had two terminals for the mains coming in.
khixxx said:
Your meter is broke
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Fluke 87, never had a problem since I got it in '93.
mdshunk said:
neat . Split bus, eh?
Click to expand...
No, it was about a 5-year old SD QO panel.

Some good guesses here, though!
 
E

Ebow

Member
CRS strikes again

CRS strikes again

I've had this problem in the last couple of years. But after fifteen minutes of trying to remember how I solved it I still can't remember. CRS strikes again.

Gene
 
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