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#109579 - 11/06/05 01:46 PM Construction Temp. Pics
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Pictures submitted by magoo66:

 Quote:
These are pics of a construction temporary power supply that we (PoCo) metered, energized then later responded to a costomer complaint of "bad power". The inspection process failed miserably here. Local AHJ approved the install, PoCo hooked it up. This is a customer (homeowner) constructed/modified temp. The arc mark came from the customer and a "friend" troubleshooting the install before they called us, evidently they tried to re-install the main bonding jumper. The meter seal was intact when the serviceman arrived. Also notice the proximity to a 75kva pad mount.






Thanks Jeff!.

[This message has been edited by Trumpy (edited 11-07-2005).]
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#109580 - 11/06/05 02:16 PM Re: Construction Temp. Pics
sawdust454 Offline
Member

Registered: 03/20/05
Posts: 19
Loc: Waynesboro, Va USA
I am speechless, I wonder if this cured the homeowner and friend from DIY electrical work.
I hope so.
Ron

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#109581 - 11/06/05 03:54 PM Re: Construction Temp. Pics
mamills Offline
Member

Registered: 11/30/01
Posts: 739
Loc: Wharton, Texas, USA
Ron: If they're still alive, I doubt they're cured. Stupidity has an ominous habit of repeating itself...

...and, unfortunately there seems to be a neverending supply of DIY'ers to take his place...

Mike (mamills)

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#109582 - 11/06/05 05:38 PM Re: Construction Temp. Pics
sierra electrician Offline
Member

Registered: 02/12/05
Posts: 220
Loc: North Fork, CA USA
Trumpy, are there codes on meter placement and meter hieght down there.

Rob

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#109583 - 11/06/05 06:26 PM Re: Construction Temp. Pics
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Rob,
They aren't actually my pictures.
I only posted them for Jeff.
Would the real Jeff please stand up?.
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#109584 - 11/06/05 07:03 PM Re: Construction Temp. Pics
BigJohn Offline
Member

Registered: 03/06/04
Posts: 352
Loc: Boston, MA
So for my own edification, let me see if I understand what happened here: Insulated neutral bus was at 120V. Both lugs on the same leg at 120V. All the 240 volt loads would've been supplied with 120, all the 120 volt loads would've been seeing 240.

I can't tell what's going on with any of the grounds or the GEC, but I assume something was grounded somewhere, and when DIY reinstalled the bonding jumper he saw a dead short on the unfused line conductors. The neutral lugs in the meterbase look insulated, but from the size of the scortch-mark, maybe not?

-John

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#109585 - 11/06/05 07:55 PM Re: Construction Temp. Pics
Attic Rat Offline
Member

Registered: 12/14/03
Posts: 530
Loc: Bergen Co.,N.J. USA
... Oh well, just when you think you've seen everything,......"I CAN'T BELIEVE MY EYES"!!!!!! Oh,...my brain hurts.. and an AHJ approved it before the PoCo tied it in?? I particularly love the blue jumper... What were they thinking?? They were definitely heading for a "Darwin Award" ..or two...
Russ

Oh, and P.S.... What/who finally killed the power?? or did it just melt off the lug?? They couldn't have pulled the meter themselves because the seal was still on it..


[This message has been edited by Attic Rat (edited 11-06-2005).]
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#109586 - 11/06/05 09:50 PM Re: Construction Temp. Pics
yaktx Offline
Member

Registered: 02/19/03
Posts: 286
Loc: Austin, Texas, USA
 Quote:
The neutral lugs in the meterbase look insulated, but from the size of the scortch-mark, maybe not?


Not would be a good guess. The neutral lug is the one in the center, where you see a green conductor terminated. (I have but rarely seen a meter can in which this terminal is insulated.) It's mighty nice of these DIYers to use proper color code so we can dissect their apparent intentions despite the scorch marks. Consider the insulated lug on the lower left to be a hot lug. (Neutral on the right lugs is the correct wiring for a 120V socket meter, but I digress. Such meters are not used nowadays.) Were it not for the PVC nipple, the meter installer would have been the one to see the arc, and it would have been even uglier than this!

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#109587 - 11/06/05 09:55 PM Re: Construction Temp. Pics
yaktx Offline
Member

Registered: 02/19/03
Posts: 286
Loc: Austin, Texas, USA
 Quote:
What/who finally killed the power?? or did it just melt off the lug??


I'll bet running away in a panic did an effective job of removing the jumper, thus breaking the circuit. The breaker may also have tripped.

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#109588 - 11/06/05 09:59 PM Re: Construction Temp. Pics
yaktx Offline
Member

Registered: 02/19/03
Posts: 286
Loc: Austin, Texas, USA
...on second thought, the breaker wouldn't have done squat. Running away in a panic. That's it.

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