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Construction Temp. Pics #109579
11/06/05 04:46 PM
11/06/05 04:46 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
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.


[Linked Image]

[Linked Image]

Thanks Jeff!. [Linked Image]

[This message has been edited by Trumpy (edited 11-07-2005).]

2017 / 2014 NEC & Related Books and Study Guides
Re: Construction Temp. Pics #109580
11/06/05 05:16 PM
11/06/05 05:16 PM
S
sawdust454  Offline
Member
Joined: Mar 2005
Posts: 20
Waynesboro, Va USA
I am speechless, I wonder if this cured the homeowner and friend from DIY electrical work.
I hope so.
Ron

Re: Construction Temp. Pics #109581
11/06/05 06:54 PM
11/06/05 06:54 PM
M
mamills  Offline
Member
Joined: Nov 2001
Posts: 745
Wharton, Texas, USA
Ron: If they're still alive, I doubt they're cured. Stupidity has an ominous habit of repeating itself... [Linked Image]

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

Mike (mamills)

Re: Construction Temp. Pics #109582
11/06/05 08:38 PM
11/06/05 08:38 PM
S
sierra electrician  Offline
Member
Joined: Feb 2005
Posts: 219
North Fork, CA USA
Trumpy, are there codes on meter placement and meter hieght down there.

Rob

Re: Construction Temp. Pics #109583
11/06/05 09:26 PM
11/06/05 09:26 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Rob,
They aren't actually my pictures.
I only posted them for Jeff.
Would the real Jeff please stand up?. [Linked Image]

Re: Construction Temp. Pics #109584
11/06/05 10:03 PM
11/06/05 10:03 PM
B
BigJohn  Offline
Member
Joined: Mar 2004
Posts: 391
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

Re: Construction Temp. Pics #109585
11/06/05 10:55 PM
11/06/05 10:55 PM
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
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).]


.."if it ain't fixed,don't break it...call a Licensed Electrician"
Re: Construction Temp. Pics #109586
11/07/05 12:50 AM
11/07/05 12:50 AM
Y
yaktx  Offline
Member
Joined: Feb 2003
Posts: 288
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!

Re: Construction Temp. Pics #109587
11/07/05 12:55 AM
11/07/05 12:55 AM
Y
yaktx  Offline
Member
Joined: Feb 2003
Posts: 288
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.

Re: Construction Temp. Pics #109588
11/07/05 12:59 AM
11/07/05 12:59 AM
Y
yaktx  Offline
Member
Joined: Feb 2003
Posts: 288
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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