sub panel main breaker

[jeff43222]

One thing about the fire depts. they have a universal key,4 ft. long with a sharp edge and a pick on the opposing side.This usually opens any and all doors.

The fire department here uses the same key. They work really well.

 

[don_resqcapt19]

The fire department here uses the same key. They work really well.

Not as good as the "jet-axe" product that was on the market abut 30 years ago. It was a box with shaped charge that you hung on the door or wall. You stuck it to the door or wall, ran the cable out and connected it the battery and you had an instant hole.
Don

 

[DaveTap]

OK I have one... what if the sub panel is lugged off the main bus of a larger panel next to it or tapped off a larger set of feeders... the wires and smaller bus still need overcurrent protection.

 

[buck33k]

Dave, that one took me a minute.

 

[racerdave3]

Stew, did you ever get an answer to your original question?

 

[stew]

somewhat. noone said anything about a detached garge need ing a main tho.
in my case it was a house sub in the basement .

 

[DaveTap]

Stew, as was mentioned in the first post a sub panel does not require MBR if its in the same building as the panel feeding it, (provided it is not lugged off the bus of that panel or tapped off a larger set of feeders as either case would create a need for OCP)

Sorry if everyone got a little carried away but I guess they thought you were asking a quiz question.

 

[racerdave3]

So then in a detached building, such as a detached garage, the panel must have a main breaker installed? Does the 6 switch rule apply here, or is a subpanel of any size required to have the main breaker?

 

[DaveTap]

So then in a detached building, such as a detached garage, the panel must have a main breaker installed? Does the 6 switch rule apply here, or is a subpanel of any size required to have the main breaker?

If you don't have a seperate disconnect then yes MBR or 6 switch rule applies. The bigger challenges come in grounding and bonding.

 

[electrofelon]

I will refeed the sub with 2224 al 100 amp sub breaker at the main..

I believe in this case th #2 SER will need a 90 amp ocpd unless your jurisdiction allows 310.15(B)(6)n to be applied to all feeders.

 

[LarryFine]

I believe in this case th #2 SER will need a 90 amp ocpd unless your jurisdiction allows 310.15(B)(6)n to be applied to all feeders.

Correctamundo! I learned that the hard way: 90a breakers aren't cheap!