Romex life expancy when exposed to UV

Originally Posted By: phinsperger
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Does anyone know what the life expancy of the sheathing and insulation of standard NM cable when exposed to the ultra violet rays of the sun. Cable intalled in an unfinished interior space where the sun can come through a window and strike the cable. Obviously this will vary depending on location, orientan of the window and anything else affecting exposure. But does anyone have a rough idea how long it will last?



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Paul Hinsperger
Hinsperger Inspection Services
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Originally Posted By: Mike Parks
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Zero. It can not be exposed to sunlight.


Mike P.


Originally Posted By: phinsperger
This post was automatically imported from our archived forum.



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Paul Hinsperger
Hinsperger Inspection Services
Chairman - NACHI Awards Committee
Place your Award Nominations
here !

Originally Posted By: jtedesco
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I have seen this product exposed to rays of the sun, and after time does show signs of discoloration, however, as far as the life of the product?


Well, let me take a look ................ yup, still OK after 20 years, darn its raining outside today.

There are more problems with the older wiring methods used in attic spaces and outside walls. The older type of insulation was found to be at the end of its life, and that is why the new cable after 1984 were manufactured with a higher rating.

The most recent change in the electrical industry was to require that the insulated conductors and cables used where exposed to direct rays of the sun are required to be of a type listed for sunlight resistance, or listed and marked ?sunlight resistant.?

Home Inspectors do look at drip loops and in many cases the insulation is gone or dried out and deteriorated. Recommended replacement may be in order. If a qualified electrical installed does the work I would think that the new insulation would be used.


--
Joe Tedesco, NEC Consultant

www.nachi.org/tedescobook.htm

Originally Posted By: Mike Parks
This post was automatically imported from our archived forum.



Paul


You will have no problems with the NM wire.

How does this fall within a Home Inspection?

Mike P.