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Minimum Bend Radius? #213775 07/15/14 07:32 PM
Joined: Oct 2000
Posts: 3,622
Admin Offline OP
submitted by Gregory Madjeski:

600v, 500kcmil cable termination.

[Linked Image from]

2017 / 2014 NEC & Related Books and Study Guides
Re: Minimum Bend Radius? [Re: Admin] #213777 07/15/14 10:44 PM
Joined: Apr 2002
Posts: 7,178
HotLine1 Offline
OK, lets start a comment...

Judging by the insulation, and tinned conductor, this is an 'aged' installation.

Hard to tell from the pic, but the clearance from those extra long bolts??

Is the termination (clamp) rated for what appears to be parallel secondaries? Or is this unique engineering??

Is this a POCO transformer?? If so, then throw the NEC out!

Re: Minimum Bend Radius? [Re: Admin] #213779 07/16/14 05:58 PM
Joined: Apr 2013
Posts: 22
sedesigner1 Offline
Yes it's an older installation. The transformer is one of 3, single phase Allis-Chalmers "Curvacore" transformers and were used to step down 3 phase 4160V to 208/120V. I did a web search and couldn't find any info on them. All 3 were leaking oil and have been replaced.

Last edited by sedesigner1; 07/16/14 05:59 PM.
Re: Minimum Bend Radius? [Re: Admin] #213781 07/16/14 07:03 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Leaking oil? Did you, btw, try to soak a paper towel in the oil, then try to set it afire?

Old location .... oil that won't burn ... Hello, PCB's. Not really the sort of thing you simply toss in a dumpster or hose down the drain.

Re: Minimum Bend Radius? [Re: Admin] #213784 07/16/14 08:03 PM
Joined: Apr 2013
Posts: 22
sedesigner1 Offline
They were tagged as PCB free, but I never touched it. There was a service tag on it at least. We were supposed to get an oil sample, but the sampling valve was so corroded we were afraid it would break. I see the same PCB free tags on oil filled utility breakers, but we're replacing those with SF6 dead tank breakers.

Re: Minimum Bend Radius? [Re: Admin] #213785 07/16/14 08:21 PM
Joined: Apr 2002
Posts: 7,178
HotLine1 Offline
OK, now we know 'customer owned', PCB free, a 'mat' setup, and old.

I had a few locations in Union County, NJ that I did demo and bringing the elec into the 20th century. Two locations were PCB issues,confirmed by my samples sent to a lab. The legal disposal was $$$ but necessary and a lot cheaper then dealing with a contamination issue. One of these sites had 'leakers' but thecontamination was limited to the concrete slab and 3' of soil.

Both of the above sites were replaced with POCO 2000KVA pad mounts and respective gear.

BTW, Welcome to ECN Forums from one of the 'Jersey Guys'!!

Re: Minimum Bend Radius? [Re: Admin] #213789 07/17/14 03:58 PM
Joined: Apr 2013
Posts: 22
sedesigner1 Offline
Our "leakers" were on concrete so no oil went into soil, but the disposal fee was high (from what I heard). We also replaced the 4160 with a new 12.47KV service & POCO 300KVA 3 phase pad mount and gear. Some of the old stuff I see is almost beyond belief that somebody wasn't killed. Also, thanks for the welcome!

Re: Minimum Bend Radius? [Re: Admin] #213795 07/17/14 09:47 PM
Joined: Apr 2002
Posts: 7,178
HotLine1 Offline
You were lucky. Mine seeped thru what was an expansion joint.

I have to find time to look thru my old pics to see if I still have them.

Look here for a mat job...

Last edited by HotLine1; 07/17/14 09:52 PM.



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