Ralph:
Article 394 of the 2005 addition of the NEC "Concealed
Knob-and-Tube Wiring, II 394.10 Uses Permitted states knob and tube can
still be used under two provisions,
(1)
For extensions of existing installations.
(2)
Elsewhere by special permission ( ;i.e. The AHJ, or by engineering
approval)
As for it's use, if it has not been disturbed, properly installed,
and the original insulation is intact, that last one is the important part, in
my opinion is fine, yea I know all the engineers will be screaming. If you need
it, I can fax a copy of Article 394 to you. As for the NuArk, I had a Cutler and
Hammer engineer in my office this morning, I showed him your e-mail, he is going
to dig through his Westinghouse archives, and see if he can find anything
connecting the two companies, and will get back to me. We both do not know of
J-M ever doing anything in the electrical industry, so it is a learning
experience for us if the connection is made. Any chance you could e-mail some
clear photo's of the equipment in question?
Now I
gotta' Know
Jim
Jim,
Thanks. The feeds into the J-M NuArk panels are run in the
woven sheathing (with mica embedded in it)used to make bends in knob and tube
system. If NuArk was a Westinghouse product, my head will explode (I can
hear Sharpshooter now), since the panels are definitely J-M. To make
matters worse, it appears from the Natl Electrical Code that knob and tune was
still legal as late as 1971--but where anybody would buy components, I don't
know. 1929 Sweets doesn't show any knob and tube components from any
manufacturers, but does show BX.
Ralph
-----Original Message-----
From: Jim Follett
<
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To:
[log in to unmask]Sent: Thu, 5 Jan 2006 09:09:23
-0600
Subject: Re: [BP] Question and ?
Ralph:
I'll do some digging, I will need
added info on the specific equipment, and wire. Is the circuit wiring cloth
over rubber insulation, with solid copper conductors? Also if it is cloth
covered, is it silver plated? Any wire that is nylon coated is
1970's on in age, and will be marked on the conductors THHN/THWN
insulation which would indicate recent rewiring. I think NuArk was a
Westinghouse product, I'm verifying that. FYI Westinghouse brought out the
first thermal trip circuit breakers in 1928.
2nd Coming of Edison
In my quest to date alterations to a 1915 house in Piscataway, I am
hoping that some Pinhead (like maybe Jim the electrician....) might know
something about Johns-Manville's manufacture of electrical equipment--fuse
boxes, circuit breakers and such like, and more to the point a Nuark line of
cutoff/breaker switches? And specifically how late JM was in the
business of manufacturing such stuff.
Thanks.
Ralph