Entrance panels

[DonO]

Are any penetrations through the sheet metal of a residential entrance panel allowed per NEC? Specifically the interior section of the enclosure door assembly - the metal surface that comes in contact with the circuit breaker housing).

 

[John120/240]

I'm going to say NO. Your typical Residential panel comes pre punched for knock outs where the manufacturer intends for your entries. Then you mention the panel door, that would be a BIG NO. If one were to enter thru the door how would you make your connections ? Or maybe you mean something else by "enclosure door assembly"

 

[electricalist]

I'm not saying it's right but I have seen many panel that got ko s put in them in the sides because of meter location. Also in the back because the grade outside was much lower than the foundation inside.

 

[electrofelon]

Are any penetrations through the sheet metal of a residential entrance panel allowed per NEC? Specifically the interior section of the enclosure door assembly - the metal surface that comes in contact with the circuit breaker housing).

I think it s bit sticky. On one hand there is 110.3(B). On the other hand consider that there are only panelboards - no such thing as a loadcenter, residential panel, etc. A panelboard is mounted in a cabinet. Of course we can modify cabinets, most larger ones dont have any holes at all. Does a prepunched cabinet come with some sort of presumption that we are or must only going to use the prepunched holes? Sounds like a big stretch to me. Sounds like you may be proposing doing something strange though.......