Flexible Cables: Important Safety Issue [RE-wrenches]

[Phil Undercuffler]

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on 8/27/04 7:00 PM, Drake at solar at ecoisp.com wrote:

> I soaked a number of cable insulation samples in battery acid.  THHN is the
> only type that began to go into solution.  See the link below.
> 
> http://eagle-access.net/solar/hpart.pdf

THHN is not appropriate for this application.  310-9 Corrosive Conditions
states that "conductors exposed to oils, greases, vapors, gases, fumes,
liquids or other substances having a deleterious effect on the conductor or
insulation shall be of a type suitable for the application."

I contacted American Insulated Wire about what insulation would be
appropriate for use with batteries.  Their tech guy emphatically stated that
THHN, a thermoplastic insulation, would be a bad idea.  Ideally, the
insulation would be a Hypalon or EPR material, both of which fall under the
term RHW in the listings.  Both are a rubber type material with good
characteristics in a corrosive environment.

One caution:  Hypalon and EPR are both RHW insulations, but not all RHW
insulations are Hypalon or EPR.

He also advised that using tinned copper conductors was a really good idea.

Phil
Dankoff Solar

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