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Bad CT Cabinet #122882
01/29/06 08:41 PM
01/29/06 08:41 PM
Admin  Offline
Joined: Oct 2000
Posts: 3,547
Hi, I am an Electrician in Roanoke Virginia. I have a 3 Phase 120/208 system in a building I am working on for my company. Our local Power Company subbed out another company to wire their end of the CTs. It has taken them 5 days to get this far, but I am glad they did not energize it. This is a 1600 Amp Service - my work on top, Power Company coming in on bottom. This is just unbelievable.

When the sub was confronted about what he had done he really thought he did nothing wrong and even said this is how he was taught to do it in West Virginia.

Look closely at his neutrals, and what you can't see is that in the Xfmr each pipe full of wire is made to a phase so you see B,O,Y,N in a ring here it is all made to A, or B, or C in the Xfmr. I just could not believe it.

The Power Company who had hired them made them fix it and I made them ring out the wires to make sure everything was the way it needed to be, but the guy really did not know what he was doing and as for the Power Company, they are going to question what terminations have been made all over and under the city. This guy was the lead termination guy for his crew and has done a lot of work for our Power Company.

- (no name given)
[Linked Image]

[This message has been edited by Webmaster (edited 01-29-2006).]

Tools for Electricians:
Re: Bad CT Cabinet #122883
01/29/06 09:18 PM
01/29/06 09:18 PM
JAKEE  Offline
Junior Member
Joined: Jan 2006
Posts: 4
Sorry about the no name. I want to make a correction. That company has done alot of work for the local power company not just the crew doing this work.

Re: Bad CT Cabinet #122884
01/29/06 10:14 PM
01/29/06 10:14 PM
Dnkldorf  Offline
Joined: Dec 2004
Posts: 1,064
nowhere usa
(jaw hanging down in disbelief)



Re: Bad CT Cabinet #122885
01/29/06 10:26 PM
01/29/06 10:26 PM
Roger  Offline
Joined: May 2002
Posts: 1,716
What Dnk said!!! [Linked Image]

Jakee, welcome to the forum.


Re: Bad CT Cabinet #122886
01/29/06 10:34 PM
01/29/06 10:34 PM
BigJohn  Offline
Joined: Mar 2004
Posts: 391
Boston, MA
Let me see if I understand this:

Each pipe containes parallels for a single phase? I.e.: first pipe, A phase. Second pipe, B phase, etc.?

And the guy terminating the cables through the CTs basically created a bunch of dead-short-circuits by connecting one cable from each phase to the same bus?

But here's the trick: Why in the world did whoever installed the cables run a neutral with each pipe? If I was the guy terminating this job, I might just as soon see that and think that each pipe was supposed to contain all three phases plus a neutral. Or were the cables and terminations all done by the same fellow?


Re: Bad CT Cabinet #122887
01/29/06 10:40 PM
01/29/06 10:40 PM
frenchelectrican  Offline
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
the other thing the POCO did goof up major time if you look at the CT doughnuts and the wire colors if reading for metering why they go all 3 phase for each CT that will cancled the current reading very effective.

the only way to get the correct reading on CT is have each phase for CT doughnuts that way the meter will read it correct.
i am suprised how they do that

Merci. Marc

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: Bad CT Cabinet #122888
01/29/06 11:09 PM
01/29/06 11:09 PM
Tesla  Offline
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Cute how our man jumps from high voltage colors to low voltage colors...and NO XFMR....

This priceless photo is so hairball....

It belongs forever in the ECN archive.

Re: Bad CT Cabinet #122889
01/29/06 11:13 PM
01/29/06 11:13 PM
mahlere  Offline
Joined: Nov 2005
Posts: 507
New Jersey
what kind of conduits coming in from the xfrmr? look to be rigid. Didn't think you could separate the phases in metal conduits.

Re: Bad CT Cabinet #122890
01/30/06 12:20 AM
01/30/06 12:20 AM
Radar  Offline
Joined: Apr 2004
Posts: 349
Los Angeles, CA
why they go all 3 phase for each CT that will cancled the current reading very effective

That would be OK with me, if I were paying the power bill.

There are 10 types of people. Those who know binary, and those who don't.
Re: Bad CT Cabinet #122891
01/30/06 12:24 AM
01/30/06 12:24 AM
electure  Offline

Joined: Dec 2000
Posts: 4,280
Fullerton, CA USA
If there are an AØ, a BØ, and a CØ in each of those incoming conduits, I've got some customers that would just love to have this guy hook up their services.

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