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#106979 - 03/03/01 01:13 PM Cabinet not Bonded
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Registered: 10/07/00
Posts: 3142
Loc: NY, USA
CT Cabinet

Click Photo for a closer look


Locknut and bushing

Click Photo for a closer look.


Only standard locknuts and bushings were used
in 400 Amp. current transformer cabinet.



Frank Cinker

Pittsburgh, PA

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#106980 - 03/03/01 01:52 PM Re: Cabinet not Bonded
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
OK Frank,
we have CT's, i see 4 wires, one possibly spliced thru. i see 208V colors, i think i see something green from the upper right of the box comming down.

I'm gonna go out on a limb here..

Are we dealing with a seperatly derived system, and violating 250-92?


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#106981 - 03/03/01 02:17 PM Re: Cabinet not Bonded
Tom Offline
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Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
Shame on everyone involved. The installer failed to bond the cabinet & the conduit nipples (they might be bonded at the other end, though I tend to doubt it). If this passed inspection, the inspector was asleep & if it was energized by the power company, they too dropped the ball.

250-92 is clear about what is to be bonded & 250-94 tells you what you can/cannot use. Plain jane locknuts certainly don't cut the mustard & the #2 jumper from the grounded conductor to the CT cabinet is also missing. Also, the wireway in the upper right corner must also be bonded (bet it isn't).
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#106982 - 03/03/01 04:36 PM Re: Cabinet not Bonded
cinkerf Offline
Member

Registered: 12/03/00
Posts: 81
Loc: Pittsburgh, Pennsysvania. ...
Sparky,

Tom,

This installation has not been inspected yet. I took photo so I could present it to our City's Electrical Inspection Department. It's my job to review Contractor's work performed for our Department. I work for the City of Pittsburgh. The Contractor doesn't get paid if it is not a legal installation. It is clearly in violation of the section you mentioned Tom. It is a 120/208 Volt, Three Phase, Four Wire Service Lateral. The existing C.T. Cabinet was rusted. The Contractor installed a new one and reworked the raceway.

Frank (cinkerf)

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#106983 - 03/04/01 06:05 AM Re: Cabinet not Bonded
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
They also might want to do something about that black neutral conductor.

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#106984 - 03/04/01 11:10 PM Re: Cabinet not Bonded
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Is that a "Corner Grounded Delta Configuration" (tongue in cheek)?

Looks like a green tap on the A leg...

BTW...My wife is who spotted it!

I realize that these are supplied assembled, but is green the proper color for the CT tap?
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#106985 - 03/05/01 03:18 AM Re: Cabinet not Bonded
cinkerf Offline
Member

Registered: 12/03/00
Posts: 81
Loc: Pittsburgh, Pennsysvania. ...
Sparky,

Your wife has a good eye for noticing things. The green wire you see is a #8 AWG. One end attaches to the wireway in the upper right corner of photo. The other end attaches to a ground rod located beneath C.T. cabinet. I suppose that was an attempt to ground system.

Frank (cinkerf)

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