Minimum MCB of an electrical panel

[zam]

Regardless of how small the load is on the panel, does the NEC mention a minimum allowed size for the main circuit breaker of an electrical panel? Thank you.

 

[electricalist]

Im not sure and im reading 240 15 amps is what im finding so far.

 

[Smart $]

Well, since MLO panels are commonplace, I'd have to say zero...

Even when a service panelboard is the item of issue, the NEC only specifies the minimum equipment rating, not the main circuit breaker rating. That is determined by the calculated load.

 

[kwired]

That is a little like asking if it is permissible protect a conductor usually rated for 100 amps with a 15 amp overcurrent device (or even less).

One difference is the conductor could have adjustments applied to it in some circumstances and have it's ampacity reduced - but panelboards don't get ampacity adjustments that I am aware of.