Panel disconnects

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OneShot said:
When do panels (less than 600volt) require main breakers?
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Only when they are the main panel / main disconnect OR if it is a panel in a seperate structure.

However, If the panel has no more than 6 throws of the hand in either of the instances above, a main is not required.

~Matt
 
OneShot said:
When do panels (less than 600volt) require main breakers?
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Never. There are rules that require that structures and some equipment have a means of disconnect and rules that require line side overcurrent protection for the panel. It is true that often a main breaker in a panel is used to satisfy these rules, but there is no specific rule that requires the panel itself to have a main, and there are other methods that can be used to satisfy these rules without a main breaker in the panel.
 
readydave8 said:
Is that also true for mobile home panel?
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Mobile homes are covered in Art 550. Here is what it says about main panel and disconnecting means in 550.11

(A) Disconnecting Means. A single disconnecting means
shall be provided in each mobile home consisting of a circuit
breaker, or a switch and fuses and its accessories installed
in a readily accessible location near the point of
entrance of the supply cord or conductors into the mobile
home. The main circuit breakers or fuses shall be plainly
marked ?Main.? This equipment shall contain a solderless
type of grounding connector or bar for the purposes of
grounding, with sufficient terminals for all grounding conductors.
The terminations of the grounded circuit conductors
shall be insulated in accordance with 550.16(A). The
disconnecting equipment shall have a rating not less than
the calculated load. The distribution equipment, either circuit
breaker or fused type, shall be located a minimum of
600 mm (24 in.) from the bottom of such equipment to the
floor level of the mobile home.
 
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