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Interesting Transformer Hook-up #169989 10/22/07 09:41 PM
Joined: Jul 2002
Posts: 8,262
Trumpy Offline OP
Member
Photo and Info submitted by HotLine1:
Quote
I 'found' this part of a new construction job last Sunday. Going for a brunch cruise for a birthday for a friend.
Had to wait to board, so, walking around and curious as a AHJ....found the pad mount utility xfr....un-energized and accessable without the keys.

Low & behold....look at this quality workmanship.

IF I can get back there again, and with a real camera (this is from the cell phone)...more to come


[Linked Image]

Thanks John.

2017 / 2014 NEC & Related Books and Study Guides
Re: Interesting Transformer Hook-up [Re: Trumpy] #170001 10/23/07 11:27 AM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline
Member
What on earth is going on with the colors there?

I think the terminal on the lower left is X1, but is the one upper right with mostly conductors taped red X3? 208Y/120?

But then is the remaining terminal X0? Red, brown, a couple of orange, one of which is marked black farther down..... confused


Re: Interesting Transformer Hook-up [Re: pauluk] #170003 10/23/07 03:31 PM
Joined: Apr 2002
Posts: 7,102
HotLine1 Offline
Member
Paul:
Left landing is XO (notice the bond jumper) and then left to right X1, X2, X3.

I assume it's 120/208 Y; but.....all I could 'see' inside the small building adjacent to this was the very top of 1 panel.

The CT cabs didn't look much better!


John
Re: Interesting Transformer Hook-up [Re: HotLine1] #170004 10/23/07 05:27 PM
Joined: Dec 2000
Posts: 4,280
electure Offline
Member
If I didn't see the lugs, I'd think these were hoses for a soda dispenser.

What type of wire is that, John?

Re: Interesting Transformer Hook-up [Re: electure] #170007 10/23/07 07:25 PM
Joined: Apr 2002
Posts: 7,102
HotLine1 Offline
Member
Electure:
I'm not sure...from experience I hope it's THHN/THWN! Yes, soda hoses! As this is not in the Twp I work in, I had to do a quick look-see. I'm going to try to get back there for a better 'look', without attracting to much attention..you know that trespass thing.


John
Re: Interesting Transformer Hook-up [Re: HotLine1] #170018 10/24/07 08:24 AM
Joined: Aug 2002
Posts: 1,691
S
SvenNYC Offline
Member
Quote
m not sure...from experience I hope it's THHN/THWN!


It looks to me like it's that old fahioned rubber and cloth-wrapped wire.

I know that cloth-wrapped power cord is still made, but I didn't know they still made that heavy duty house wiring stuff anymore!

Re: Interesting Transformer Hook-up [Re: SvenNYC] #170019 10/24/07 09:10 AM
Joined: Jul 2002
Posts: 8,262
Trumpy Offline OP
Member
John,
Are them wires covered with some sort of numbered tape?.
One thing I can't get over is the length of them bolts on the transformer lugs, that looks like an arc fault accident just waiting to happen.

Re: Interesting Transformer Hook-up [Re: Trumpy] #170028 10/24/07 01:40 PM
Joined: Apr 2002
Posts: 7,102
HotLine1 Offline
Member
Mike: (Trumpy)
Good eyes, I think that it's number tape, that's my first impression. As I hinted above....had to be quick & careful.

The bolts would buy a red tag from me; and the utility will have a comment also.

Sven:
No, cloth wrapped and rubber went away a long time ago (at the supply houses)

Stay safe


John
Re: Interesting Transformer Hook-up [Re: Trumpy] #170123 10/27/07 02:56 AM
Joined: Oct 2004
Posts: 803
mxslick Offline
Member
Originally Posted by Trumpy
John,
Are them wires covered with some sort of numbered tape?.
One thing I can't get over is the length of them bolts on the transformer lugs, that looks like an arc fault accident just waiting to happen.


Mike, if that's indeed number tape wrapped around those wires, I'd personally kick the hind parts of the sparky if he worked for me. That number tape is very costly!!

And I hadn't really noticed the bolts...Yikes!! They also don't appear to be brass...but is brass (or other metal) a required type of material for those bolts?


Stupid should be painful.
Re: Interesting Transformer Hook-up [Re: mxslick] #170141 10/27/07 06:47 PM
Joined: Apr 2002
Posts: 7,102
HotLine1 Offline
Member
MX:
Utility (PSE&G) requires 1/2" dia., non-magnetic stainless steel hardware on pad mount & CT terminations, per the Green Book specs.

As to length, aside from industry practice & good workmanship...the book says 'bolts mustthread thru the nuts, with several threads showing'... That can be subject to opinions (several). I use the closest stock length of bolts as 1/2" come in 1/2" length increments.

I'm going to try to get back there Mon.

Last edited by HotLine1; 10/27/07 06:47 PM. Reason: spelling

John
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