Re: THHN

• To: tesla-at-pupman-dot-com
• Subject: Re: THHN
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 19 Sep 1999 18:10:28 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

THHN is a reference to the type of insulation on wiring, coded per the
National Electrical Code.

T - Thermoplastic (60C) for dry locations
TW - moisture resistant thermoplastic for wet locations
THHN - heat resistant Thermoplastic (90C) for dry locations
THWN - heat resistant (75C) for dry and wet locations

T == thermoplastic (R == rubber, X == crosslinked synthetic polymer, A ==
Asbestos, etc.)
W == moisture resistant
H == heat resistant 
HH == more heat resistant

The N means it has a nylon outer jacket (which helps reduce abrasion damage
when pulling through conduit)..

and so forth...

The letter codes aren't all that systematic, though... MTW means machine
tool wire, for instance..


----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: THHN
> Date: Saturday, September 18, 1999 6:21 AM
> 
> Original Poster: "Brian H Le Page" <brian-at-oneau-dot-com> 
> 
> All
> 
> I sometimes come across references to THHN wire.  Can someone tell me
what
> this is please?
> 
> Dr B.
> Brian H Le Page, Ph.D, Fleet, England
> 'Scientific progress goes boink', Bill Watterson, 1991
> 
> 
> 

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