Q
Number of service drops/laterals per building
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A
A building or structure is generally supplied by only one service, with specific exceptions (e.g. fire pumps, emergency systems, different voltages, or by special permission).
NEC 230.2
Q
Number of service drops/laterals per building
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A
A building or structure is generally supplied by only one service, with specific exceptions (e.g. fire pumps, emergency systems, different voltages, or by special permission).
NEC 230.2
Q
Maximum number of service disconnects
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A
Up to six disconnects, grouped in one location, are permitted to disconnect all ungrounded service conductors -- either in a single enclosure or a group of separate enclosures.
NEC 230.71
Q
Maximum number of service disconnects
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A
Up to six disconnects, grouped in one location, are permitted to disconnect all ungrounded service conductors -- either in a single enclosure or a group of separate enclosures.
NEC 230.71
Q
Service disconnect location requirement
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A
Must be installed at a readily accessible location, either outside or nearest the point of entry of the service conductors, inside or outside the building.
NEC 230.70(A)
Q
Service disconnect location requirement
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A
Must be installed at a readily accessible location, either outside or nearest the point of entry of the service conductors, inside or outside the building.
NEC 230.70(A)
Q
Service overhead clearance above finished grade (residential driveway)
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A
A minimum of 12 ft where the voltage doesn't exceed 300V to ground and the area is subject to vehicular traffic (e.g. residential driveways), 18 ft for higher voltages typical of these areas.
NEC 230.24(B)
Q
Service overhead clearance above finished grade (residential driveway)
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A
A minimum of 12 ft where the voltage doesn't exceed 300V to ground and the area is subject to vehicular traffic (e.g. residential driveways), 18 ft for higher voltages typical of these areas.
NEC 230.24(B)
Q
Service overhead clearance above roofs
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A
A minimum of 8 ft above the roof surface, extending 3 ft in all directions from the edge, with specific reduced-clearance exceptions for low-slope roofs and limited overhangs.
NEC 230.24(A)
Q
Service overhead clearance above roofs
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A
A minimum of 8 ft above the roof surface, extending 3 ft in all directions from the edge, with specific reduced-clearance exceptions for low-slope roofs and limited overhangs.
NEC 230.24(A)
Q
Service mast requirements
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A
Must be of adequate strength to support the service-drop conductors, and only power service-drop/lateral conductors -- not used to support other wiring, unless specifically braced/guyed as permitted.
NEC 230.28
Q
Service mast requirements
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A
Must be of adequate strength to support the service-drop conductors, and only power service-drop/lateral conductors -- not used to support other wiring, unless specifically braced/guyed as permitted.
NEC 230.28
Q
Underground service lateral -- who owns the point of demarcation?
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A
The service point is the point of connection between the serving utility and the premises wiring -- established by agreement with the utility, marking where NEC jurisdiction over the installation begins.
NEC Art. 100 (Service Point)
Q
Underground service lateral -- who owns the point of demarcation?
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A
The service point is the point of connection between the serving utility and the premises wiring -- established by agreement with the utility, marking where NEC jurisdiction over the installation begins.
NEC Art. 100 (Service Point)
Q
Service conductor sizing basis
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A
Sized per the calculated load of the installation (NEC Article 220), not less than the rating of the service discontinuous disconnecting means, with a minimum ampacity floor for small dwelling services.
NEC 230.42
Q
Service conductor sizing basis
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A
Sized per the calculated load of the installation (NEC Article 220), not less than the rating of the service discontinuous disconnecting means, with a minimum ampacity floor for small dwelling services.
NEC 230.42
Q
Minimum service disconnect rating for a one-family dwelling
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A
100A, per the general minimum-service rule for dwellings with more than a strictly minimal load.
NEC 230.79(C)
Q
Minimum service disconnect rating for a one-family dwelling
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A
100A, per the general minimum-service rule for dwellings with more than a strictly minimal load.
NEC 230.79(C)
Q
Service disconnect marking requirement
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A
Each service disconnect must be permanently marked to identify it as a service disconnect.
NEC 230.70(B)
Q
Service disconnect marking requirement
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A
Each service disconnect must be permanently marked to identify it as a service disconnect.
NEC 230.70(B)
Q
Working clearance in front of service equipment
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A
Same general working-space rule as other electrical equipment -- typically 36 in. deep (more at higher voltage/exposure conditions) and 30 in. wide, with 6.5 ft headroom.
NEC 110.26(A)
Q
Working clearance in front of service equipment
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A
Same general working-space rule as other electrical equipment -- typically 36 in. deep (more at higher voltage/exposure conditions) and 30 in. wide, with 6.5 ft headroom.
NEC 110.26(A)
Q
Service mast weatherhead location
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A
Must be located above the point of attachment of the service-drop conductors, keeping water from an overhead drop out of the raceway.
NEC 230.54(C)
Q
Service mast weatherhead location
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A
Must be located above the point of attachment of the service-drop conductors, keeping water from an overhead drop out of the raceway.
NEC 230.54(C)
Q
Service conductors -- where NOT permitted to run
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A
Not permitted to run through the interior of a building unless installed in accordance with the specific wiring methods approved for that use (e.g. encased in 2 in. of concrete, or in specific raceways).
NEC 230.6
Q
Service conductors -- where NOT permitted to run
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A
Not permitted to run through the interior of a building unless installed in accordance with the specific wiring methods approved for that use (e.g. encased in 2 in. of concrete, or in specific raceways).
NEC 230.6
Q
Service equipment bonding requirement
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A
All non-current-carrying metal parts of service equipment must be bonded together and to the grounded (neutral) conductor -- this is where the system's main bonding jumper is installed.
NEC 230.66, 250.24
Q
Service equipment bonding requirement
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A
All non-current-carrying metal parts of service equipment must be bonded together and to the grounded (neutral) conductor -- this is where the system's main bonding jumper is installed.
NEC 230.66, 250.24
Q
Simultaneous rule for multiple service disconnects (6-disconnect rule)
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A
A single service disconnecting means is preferred; if more than one is used (up to six), a permanent plaque must show the load served by each.
NEC 230.72(A), 230.79
Q
Simultaneous rule for multiple service disconnects (6-disconnect rule)
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A
A single service disconnecting means is preferred; if more than one is used (up to six), a permanent plaque must show the load served by each.
NEC 230.72(A), 230.79
Q
Underground service conductor burial depth (typical residential)
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A
Minimum 24 in. for most residential direct-buried service conductors not otherwise protected, though this varies with the specific wiring method and any GFCI protection of the circuit -- always check Table 300.5.
NEC 300.5, Table 300.5
Q
Underground service conductor burial depth (typical residential)
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A
Minimum 24 in. for most residential direct-buried service conductors not otherwise protected, though this varies with the specific wiring method and any GFCI protection of the circuit -- always check Table 300.5.
NEC 300.5, Table 300.5
Q
Service disconnect rating vs. calculated load
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A
The disconnect must have a rating not less than the calculated load, determined under Article 220 (Standard or Optional method for dwellings).
NEC 230.79
Q
Service disconnect rating vs. calculated load
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A
The disconnect must have a rating not less than the calculated load, determined under Article 220 (Standard or Optional method for dwellings).
NEC 230.79
Q
Surge protection requirement on dwelling services
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A
A surge-protective device (SPD) is required to be installed for services supplying dwelling units.
NEC 230.67
Q
Surge protection requirement on dwelling services
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A
A surge-protective device (SPD) is required to be installed for services supplying dwelling units.
NEC 230.67