Detached Garage,Req"d # of circuits
- Thread starter mrswib
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Re: Detached Garage,Req"d # of circuits
MY local electrical inspectors, here in Montgomery County Maryland, Are a model of competence and even handedness in electrical inspection. They have never written a corrective order or declined approval were I didn't have to say they were right. I have wired multiple detached garages here with single branch circuits when all that was wanted was lighting. I am fairly confident that if there was a requirement for a minimum feeder size they would have bagged me by now. The only place that I have found a minimum sizing for supply to buildings is in 230.79 and that only applies to buildings supplied by there own service. Even there the disconnecting means may be as small as 15 ampere if only a single circuit is supplied.
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Tom
[ July 14, 2003, 12:17 PM: Message edited by: hornetd ]
MY local electrical inspectors, here in Montgomery County Maryland, Are a model of competence and even handedness in electrical inspection. They have never written a corrective order or declined approval were I didn't have to say they were right. I have wired multiple detached garages here with single branch circuits when all that was wanted was lighting. I am fairly confident that if there was a requirement for a minimum feeder size they would have bagged me by now. The only place that I have found a minimum sizing for supply to buildings is in 230.79 and that only applies to buildings supplied by there own service. Even there the disconnecting means may be as small as 15 ampere if only a single circuit is supplied.
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Tom
[ July 14, 2003, 12:17 PM: Message edited by: hornetd ]
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Detached Garage,Req"d # of circuits
There is no requirement for power at a detached garage. If it is installed then the NEC obvioulsy is followed. It can be a single 15A 120v branch circuit or a 200 amp service. However the size of the service or feeder would have to be sufficient for the connected load.
There is no requirement for power at a detached garage. If it is installed then the NEC obvioulsy is followed. It can be a single 15A 120v branch circuit or a 200 amp service. However the size of the service or feeder would have to be sufficient for the connected load.
Re: Detached Garage,Req"d # of circuits
250.32 Two or More Buildings or Structures Supplied from a Common Service
(A) Grounding Electrode. Where two or more buildings or structures are supplied from a common AC service by a feeder(s) or branch circuit(s), the grounding electrode(s) required in Part III of this article at each building or structure shall be connected in the manner specified in 250.32(B) or (C). Where there are no existing grounding electrode(s), the grounding electrode(s) requires in Part III of this article shall be installed.
250.32 Two or More Buildings or Structures Supplied from a Common Service
(A) Grounding Electrode. Where two or more buildings or structures are supplied from a common AC service by a feeder(s) or branch circuit(s), the grounding electrode(s) required in Part III of this article at each building or structure shall be connected in the manner specified in 250.32(B) or (C). Where there are no existing grounding electrode(s), the grounding electrode(s) requires in Part III of this article shall be installed.
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: Detached Garage,Req"d # of circuits
Ok here's the code:
look at the bold face
210.52
(G) Basements and Garages. For a one-family dwelling, at least one receptacle outlet, in addition to any provided for laundry equipment, shall be installed in each basement and in each attached garage, and in each detached garage with electric power . See 210.8(A)(2) and (A)(5). Where a portion of the basement is finished into one or more habitable rooms, each separate unfinished portion shall have a receptacle outlet installed in accordance with this section.
250.32 Two or More Buildings or Structures Supplied from a Common Service.
(A) Grounding Electrode. Where two or more buildings or structures are supplied from a common ac service by a feeder(s) or branch circuit(s), the grounding electrode(s) required in Part III of this article at each building or structure shall be connected in the manner specified in 250.32(B) or (C). Where there are no existing grounding electrodes, the grounding electrode(s) required in Part III of this article shall be installed.
Exception: A grounding electrode at separate buildings or structures shall not be required where only one branch circuit supplies the building or structure and the branch circuit includes an equipment grounding conductor for grounding the conductive non?current-carrying parts of all equipment.
[ July 14, 2003, 11:44 PM: Message edited by: hurk27 ]
Ok here's the code:
look at the bold face
210.52
(G) Basements and Garages. For a one-family dwelling, at least one receptacle outlet, in addition to any provided for laundry equipment, shall be installed in each basement and in each attached garage, and in each detached garage with electric power . See 210.8(A)(2) and (A)(5). Where a portion of the basement is finished into one or more habitable rooms, each separate unfinished portion shall have a receptacle outlet installed in accordance with this section.
250.32 Two or More Buildings or Structures Supplied from a Common Service.
(A) Grounding Electrode. Where two or more buildings or structures are supplied from a common ac service by a feeder(s) or branch circuit(s), the grounding electrode(s) required in Part III of this article at each building or structure shall be connected in the manner specified in 250.32(B) or (C). Where there are no existing grounding electrodes, the grounding electrode(s) required in Part III of this article shall be installed.
Exception: A grounding electrode at separate buildings or structures shall not be required where only one branch circuit supplies the building or structure and the branch circuit includes an equipment grounding conductor for grounding the conductive non?current-carrying parts of all equipment.
[ July 14, 2003, 11:44 PM: Message edited by: hurk27 ]
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Detached Garage,Req"d # of circuits
jro, grounding electrodes are required at seperate buildings for lighting protection. Lighting does not care if its a 30 amp feeder or 800 amp feeder, single or three phase.
jro, grounding electrodes are required at seperate buildings for lighting protection. Lighting does not care if its a 30 amp feeder or 800 amp feeder, single or three phase.
Re: Detached Garage,Req"d # of circuits
Mrswib power is not required to be taken to a detached garage, but if there is power taken to it then as Hurk27 states Art. 210.52 (G) comes into effect, also Art.210.70 (A) (2) (a) & (b) apply. As for Art. 250.32 its talking about how to connect to the electrode and the second part is when no electrode is present, which then you referance 250.32 (B) or (C) but it never states that a seperate ground rod has to be installed regardless, which brings up the question if I run 2 or more branch crkts to a detached garage in pvc with an equipment ground along with the supply conductors, and there is a grounding electrode present at the main service am I required to install a groundrod.
Mrswib power is not required to be taken to a detached garage, but if there is power taken to it then as Hurk27 states Art. 210.52 (G) comes into effect, also Art.210.70 (A) (2) (a) & (b) apply. As for Art. 250.32 its talking about how to connect to the electrode and the second part is when no electrode is present, which then you referance 250.32 (B) or (C) but it never states that a seperate ground rod has to be installed regardless, which brings up the question if I run 2 or more branch crkts to a detached garage in pvc with an equipment ground along with the supply conductors, and there is a grounding electrode present at the main service am I required to install a groundrod.
Re: Detached Garage,Req"d # of circuits
mrswib,
Some cities and counties in California have requirements in their building codes for a 240V, 40A circuit to the garage for an electric car charger for battery-powered cars! So, it's run either 8-2 wg NM cable, or a min 3/4" raceway from the main panel to a 4S box.
Of course, California's requirtement for electric vehicles is as good as dead. The range limitations and cost of battery replacement did in electric vehicles, and hybrids (vehicles with an internal combustion engine and small battery pack running an electric motor) are commercially available. But I bet it takes years, if ever, for the building depts to remove the car charger circuit requirement from their books.
Cliff
mrswib,
Some cities and counties in California have requirements in their building codes for a 240V, 40A circuit to the garage for an electric car charger for battery-powered cars! So, it's run either 8-2 wg NM cable, or a min 3/4" raceway from the main panel to a 4S box.
Of course, California's requirtement for electric vehicles is as good as dead. The range limitations and cost of battery replacement did in electric vehicles, and hybrids (vehicles with an internal combustion engine and small battery pack running an electric motor) are commercially available. But I bet it takes years, if ever, for the building depts to remove the car charger circuit requirement from their books.
Cliff
pierre
Senior Member
- Location
- Westchester County, New York
Re: Detached Garage,Req"d # of circuits
Section 210.52 only says if the detached garage has electric installed, then you will be required to install at least 1 receptacle, 210.8(A)(2) says that receptacle is required to be GFCI protected.
250.32 (A) requires that the detached garage MUST HAVE a grounding electrode system (for dwellings, the electrode will most likely be ground rods).
250.32(B)(2) states, if one does not run an equipment grounding conductor (EGC), and meets all of the requirements, the Grounded Conductor can be the EGC during ground fault conditions.
225.30 states that a multiwire branch circuit is considered a SINGLE CIRCUIT for the purpose of that section. This is also where the requirement of one feed to a separate building is found.
225.31 Disconnecting means required.
225.39 is where to find the disconnecting rating for separate buildings (230.79 has identical wording for services). Notice how 225.39(B) says "not more than two 2-wire branch circuits". This is in concurrence with 225.30
Pierre
Section 210.52 only says if the detached garage has electric installed, then you will be required to install at least 1 receptacle, 210.8(A)(2) says that receptacle is required to be GFCI protected.
250.32 (A) requires that the detached garage MUST HAVE a grounding electrode system (for dwellings, the electrode will most likely be ground rods).
250.32(B)(2) states, if one does not run an equipment grounding conductor (EGC), and meets all of the requirements, the Grounded Conductor can be the EGC during ground fault conditions.
225.30 states that a multiwire branch circuit is considered a SINGLE CIRCUIT for the purpose of that section. This is also where the requirement of one feed to a separate building is found.
225.31 Disconnecting means required.
225.39 is where to find the disconnecting rating for separate buildings (230.79 has identical wording for services). Notice how 225.39(B) says "not more than two 2-wire branch circuits". This is in concurrence with 225.30
Pierre
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