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#106979 03/03/01 04:13 PM
Joined: Oct 2000
Posts: 3,672
Likes: 2
Admin Offline OP
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<img border="0" src=&q...uot;300" height="307">

<font face="Arial" size="2" color="#FF0000">Click Photo for a closer look</font>


<img border="0" src=&q...uot;300" height="223">

<font face="Arial" size="2"><font color="#FF0000">Click Photo for a closer look</font>.</font>


<font face="Arial" size="2">Only standard locknuts and bushings were used
in 400 Amp. current transformer cabinet.
</font>


Frank Cinker

Pittsburgh, PA

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#106980 03/03/01 04:52 PM
Joined: Oct 2000
Posts: 5,392
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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?

[Linked Image]

#106981 03/03/01 05:17 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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 07:36 PM
Joined: Dec 2000
Posts: 84
C
Member
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)

#106983 03/04/01 09:05 AM
Joined: Dec 2000
Posts: 4,291
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They also might want to do something about that black neutral conductor.

#106984 03/05/01 02:10 AM
Joined: Nov 2000
Posts: 2,236
Likes: 1
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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?


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
#106985 03/05/01 06:18 AM
Joined: Dec 2000
Posts: 84
C
Member
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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