Panel wiring - which thread?

[KentAT]

I recall a recent post that mentioned a certain conductor type that was not approved for use, I think by UL. It might have been related to wiring in a control panel.

I have searched quite a bit, but I cannot find it.

Anyone remember what I'm talking about? Maybe MTW, MW, or similar?

Kent

 

[petersonra]

If you are talking about control panels, UL508a is fairly specific that only certain types of wire are acceptable.

29.2 Conductor requirements
29.2.1 All internal wiring of power circuits shall have a temperature rating of 90?C (194?F) minimum and shall be one of the following:
a) Machine tool wire that complies with the Standard for Machine-Tool Wire and Cables, UL 1063. Flexing or Class K type machine tool wires and cables shall be installed in accordance
with 29.3.11;
b) Thermoset insulated wire that complies with the Standard for Thermoset-Insulated Wires and Cables, UL 44;
c) Thermoplastic insulated wire that complies with the Standard for Thermoplastic-Insulated Wires and Cables, UL 83;
d) Appliance wiring material that complies with the Standard for Appliance Wiring Material, UL 758; or
e) Welding cable installed in accordance with 29.3.11.

 

[KentAT]

Thanks.

It appears I can use the UL MTW (90 deg C) or UL AWM (105 deg C) conductors that I have. It is actually dual-identified.

Kent