hillelect
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- st. Joseph, MI
does a control panel, assembled with UL listed parts, have to have a UL label according to the national electrical code
does a control panel, assembled with UL listed parts, have to have a UL label according to the national electrical code
And allows the listing organization to collect more fees for the right to print the label.Use of the system employed by the listing organization allows the authority having jurisdiction to identify a listed product.
does a control panel, assembled with UL listed parts, have to have a UL label according to the national electrical code
The direct answer is that the NEC does not require industrial control panels be listed.
Well, article 409 would almost beg to differ.The direct answer is that the NEC does not require industrial control panels be listed.
TECHNICALLY, it does not "require" that it be listed, but you would have to follow all of the provisions of article 409, OR use a listed assembly. In 409, it requires you to perform a determination of the SCCR, Short Circuit Current Rating, of an industrial control panel that has any power devices in it and for lack of a better standard, they point you to UL-508A, Supplement SB-1 as the suggested method of attaining it.409.2 Definitions.
...
Industrial Control Panel. An assembly of two or more
components consisting of one of the following:
(1) Power circuit components only, such as motor controllers,
overload relays, fused disconnect switches, and
circuit breakers
(2) Control circuit components only, such as pushbuttons,
pilot lights, selector switches, timers, switches, control
relays
(3) A combination of power and control circuit components
Short-circuit current rating of the industrial control
panel based on one of the following:
a. Short-circuit current rating of a listed and labeled assembly
b. Short-circuit current rating established utilizing an approved method
SB1.1 These requirements cover industrial control panels provided with a short-circuit current rating.
These requirements supplement and in some cases modify the requirements contained elsewhere in this
standard.
I don't think the NEC requires a listing. But your local gov't might require a listing. I have been building panels for our new building under construction last 3 weeks. We have to get these listed,
along with panels that came with new equipment being installed. This per the city code. We can't occupy the new building unless we meet this requirement. We are getting listed by TUV SUD
which is a listing/inspection service that goes by NEC and UL508A codes.
But if I am building panels for our existing building, then we are not required to have these inspected or listed. But we build them to UL508A anyhow. And might get them listed eventually.