Flexible Cables: Important Safety Issue [RE-wrenches]

[Kurt Albershardt]

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--On Friday, August 27, 2004 7:34 PM -0600 John Wiles wrote by proxy:
>
> I too have used the 4/0 and 2/0 AWG fine stranded cables incorrectly
> over the years and was just about to connect a Sunny Island SI 4248
> with some very nice 2/0 AWG USE-2/RHW-2 fine stranded cables.
> Instead I went with regular 2/0 AWG THHN.  I installed 2/0 THHN
> through an LB and two 90° turns with only a few #$%^$#@ words and
> only two bloody joints.  Monkey grease helped.
>
> I have also been talking with Rob Cary who, as a battery guy, said
> "About Time" to my e-mail.  He has had the same problem with the
> large UPS installers, circuit breakers and other terminals, and the
> fine stranded cables.  So PV guys are not unique.


I would suggest that the place to judge appropriate use of fine stranded cables is most likely the telecommunications industry.  Large telco switchrooms regularly feature 8,000-10,000 ampere -48V DC plants and extensive use of 750 MCM superflex cabling, often featuring type DLO or other "non-approved" markings.  There is an abundance of experience with very high power DC at a voltage many RE contractors deal with, and certainly some wisdom to be had there.






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