Control Panel Internal Distance Requirements

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mspuddy@electro-matic.com said:
Is there a specification that is a guideline as to how close to the bottom of a control panel 480VAC can be ? Looked in NEC as well as UL508A with no luck so far.
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There is no special requirements in UL508a as far as I know. You would still have to meet the various clearance and bending space requirements.

Presumably you are actually asking about 480 VAC live, uninsulated parts as opposed to insulated conductors carrying 480 VAC.
 
petersonra said:
There is no special requirements in UL508a as far as I know. You would still have to meet the various clearance and bending space requirements.

Presumably you are actually asking about 480 VAC live, uninsulated parts as opposed to insulated conductors carrying 480 VAC.
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But as he said, if you are asking about line or load TERMINALS for making external connections, there are specific requirements referred to as “wire bending space” from an enclosure wall to the terminals in the direction from which the wires would enter the terminals.

In addition, 480V requires a minimum of 1” surface distance from any conductive surface, 1/2” air gap minimum. That means to ground or any other conductor of a different phase.
 
NEC has:

ARTICLE 408 — SWITCHBOARDS, SWITCHGEAR, AND PANELBOARDS
408.56, T408.56

ARTICLE 312 — CABINETS, CUTOUT BOXES, AND METER SOCKET ENCLOSURES
312.11(A), (1), (2), and (3).

ARTICLE 409 — INDUSTRIAL CONTROL PANELS
409.106 Spacings.

Which takes one to:Table 430.97(D).

Do any of these fit your application?

the worm
 
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