I recently installed a 200 amp single phase entrance to supply an attached pool house and pool to an existiing structure. the inspector said I had to size my entrance conductors for a commercial space. I asked the reasoning for this and he replied: "Because they dont sleep here." Am I missing something here? In my mind, "attached" makes it part of the dwelling. Thanks in advance. Maybe the rule for old dogs applies to this "old" electrician.
Is an attached garage or pool house a commercial space?
- Thread starter Rslover
- Start date
- Status
- Location
- Massachusetts
The inspector is right he just did not explain it well.
The NEC allows 120/240 volt service conductors and feeder conductors that supply all the power to a dwelling unit to be sized smaller than other applications.
Here is what the code section has looked like through the 2011 NEC. If you are on the 2014 things have changed.
So the inspector is correct that a detached garage or detached pool house is not a dwelling unit so that code section cannot be used.
The NEC allows 120/240 volt service conductors and feeder conductors that supply all the power to a dwelling unit to be sized smaller than other applications.
Here is what the code section has looked like through the 2011 NEC. If you are on the 2014 things have changed.
So the inspector is correct that a detached garage or detached pool house is not a dwelling unit so that code section cannot be used.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I agree with Bob. The detached area does not have the same diversity as a home does.
- Location
- Massachusetts
I agree about load diversity being an issue but a more direct issue is neither of these buildings is a dwelling so we can't even consider the diversity.
mjf
Senior Member
OP said ATTACHED
- Location
- Massachusetts
Attached in this case means incorporated into the house by block and mortar. Not detached in any form of the word. Part of the structure. Detached I would understand.
Sorry Guys, cant see this one the way any of you have explained it. Service was undersized initially or I would not have had to add this service. Should have been 400 amp to begin with. I would have increased the main entrance but AHJ had other ideas. Thanks for all the responses.
Sorry Guys, cant see this one the way any of you have explained it. Service was undersized initially or I would not have had to add this service. Should have been 400 amp to begin with. I would have increased the main entrance but AHJ had other ideas. Thanks for all the responses.
So the AHJ is allowing a second 120/240 service??? ...or is it just a second service entrance from the same service?
Either way, it still does not supply the entire dwelling load... so 310.15(B)(7) does not apply.
A building or structure is allowed only one service per 230.2. If the pool house is attached to the main structure (without appropriately rated fire walls) then a second service should not be allowed.
Without additional information, I am at a loss as to how a 2nd service was allowed but in the event it met the AHJ's criteria for a second service, then Bob's post in #3 comes into play and conductors have to be sized per 310.16 ('08 NEC) since they are not carrying ALL loads associated with the dwelling as required when using 310.15(B)(6)
Without additional information, I am at a loss as to how a 2nd service was allowed but in the event it met the AHJ's criteria for a second service, then Bob's post in #3 comes into play and conductors have to be sized per 310.16 ('08 NEC) since they are not carrying ALL loads associated with the dwelling as required when using 310.15(B)(6)
- Status