Load on an SMDB/DB

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i.qasim

Member
Location
Saudi Arabia
Hi,

while dividing load from MDB to SMDB's and DB's, I will like to know where it is mentioned in the NEC, that an SMDB is not allowed to feed more than 200KW.
It is in mind and I don't know where I heard it. I went through the NEC to find any reference but couldn't find it.

thanks.
 
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petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
i.qasim said:
Hi,

while dividing load from MDB to SMDB's and DB's, I will like to know where it is mentioned in the NEC, that an SMDB is not allowed to feed more than 200KW.
It is in mind and I don't know where I heard it. I went through the NEC to find any reference but couldn't find it.

thanks.
Click to expand...

I don't think you will even find those terms in the NEC, so there are unlikely to be any prohibitions on the size of them.

There are often engineering specs that have limits that are more stringent than the NEC.
 
don_resqcapt19

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
i.qasim said:
MDB is your main distribution board. your main circuit breaker. DB is your end panel board from where you get lighting or power circuits. SMDB is sub main dist. board. inbt the two ends.

now... !!!
Click to expand...
None of those terms or anything like them appear in the NEC. You can use any switchboard or panelboard within its rating, without limits. The NEC doesn't care what you call it.
 
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