Nec 225.32 - Ex. 1

Status
Not open for further replies.
A

AERICH

Member
225.32 Says That A Sub Panel In A Seperate Building Must Have A Main Disconnect.
Ex. 1 States That If It Is Under Single Management And On The Same Property It Can Be Located Elseware On The Premises.
I Have A 400a Main Service With 2-200a Service Disconnects One Of Which Is Controlling A Distribution Section In The Same Panel. This Is Located Outside On The Garage.
We Fed 2-100a Sub Panels In The House Each With Approx. 20 Breakers In Them.
This Is A Private Residence. Does That Not Fall Under Exception 1 Of 225.32?
 
I think not. Sorry. The exception you named has more than one condition that must be met, before you can apply it. In addition to being under a single management, there must be documented procedures for switching and disconnecting the panels, and the installation must be monitored by qualified individuals. While you are certainly qualified, nothing stops you from selling the house to an unqualified person. Also, residences are not governed by written procedures. And even if you wrote up a set of procedures for operating the panels, the next owner will not be compelled to keep them, or to follow them.

That exception was written for industrial applications, not for residences.

Welcome to the forum.
 
AERICH said:
We Fed 2-100a Sub Panels In The House Each With Approx. 20 Breakers In Them.
This Is A Private Residence. Does That Not Fall Under Exception 1 Of 225.32?
Click to expand...

Am I correct in understanding that the main service is at the garage and you fed the house, a separate structure, with 2-100 amp feeds. If that is the case you have another violation as well.
 
Dennis Alwon said:
Am I correct in understanding that the main service is at the garage and you fed the house, a separate structure, with 2-100 amp feeds. If that is the case you have another violation as well.
Click to expand...
That depends on what happens to the second of the two 200 amp service disconnects at the garage, and how power gets from it to the two 100 amp sub panels.

I was surprised that a garage needs a 200 amp service disconnect on its own. Can you elaborate on the distribution of power from the garage to the house?
 
I don't see any possible configuration possible at the garage that would allow two 100 amp feeders of the same characteristics to be run to the same house.
 
iwire said:
I don't see any possible configuration possible at the garage that would allow two 100 amp feeders of the same characteristics to be run to the same house.
Click to expand...
We don't know that that is what the OP meant. All that we know is that the house has two panels. We don't know how either gets its power. A single disconnect located at the garage (i.e., the second of two 200 amp service disconnects) could serve the house, and could be connected to a small disconnect enclosure or panel within the house. From there, two separate lines could be run to two separate 100 amp panels. That would be compliant, as only one feeder would enter the building.

Another possibility is that the 200 amp disconnect provides power to the first 100 amp panel, with the second being powered via feed-through lugs. If the conductor from the garage is rated for 200 amps, and if each 100 amp panel has a 100 amp main breaker, then this would be compliant. Well, maybe. I am not sure how feed-though lugs are configured, with respect to the main breaker. A 100 amp breaker can protect a 100 amp rated panel, but if the incoming lugs could have 200 amps going through them, you might have a problem. Is there a way to make this option work?

Let me ask the OP again: please provide more information on the installation.
 
We do 320 amp pedestals with two 200 amp main breaker panels in the residence, this is a violation in my opinion, but I only get paid from the neck down anyways. :rolleyes:
 
AERICH said:
225.32 Says That A Sub Panel In A Seperate Building Must Have A Main Disconnect.
Ex. 1 States That If It Is Under Single Management And On The Same Property It Can Be Located Elseware On The Premises.
I Have A 400a Main Service With 2-200a Service Disconnects One Of Which Is Controlling A Distribution Section In The Same Panel. This Is Located Outside On The Garage.
We Fed 2-100a Sub Panels In The House Each With Approx. 20 Breakers In Them.
This Is A Private Residence. Does That Not Fall Under Exception 1 Of 225.32?
Click to expand...
Sorry I was in a hurry this morning one of the house sub panels is a 200A panel controlled by the 2nd 200A main disconnect. The other panel is an emergency generator supply that is on a 100A breaker in the main service, & also a transfer switch.
 
stickboy1375 said:
We do 320 amp pedestals with two 200 amp main breaker panels in the residence, this is a violation in my opinion, but I only get paid from the neck down anyways. :rolleyes:
Click to expand...

Does the code need a new definition right under the definition of Service Point?
The new one would be Service Points since there would now be two locations where the service conductors would connect to the premises wiring. :grin:
 
Status
Not open for further replies.
Top