NEC 230
A building or structure shall be supplied by a max of ___ services, unless specifically permitted otherwise
1
Individual open conductors and cables, other than service entrance cables, shall not be installed within ___ feet of grade level or where exposed to physical damage
10 feet
Overhead service conductors shall have a horizontal clearance of not less than ___ feet from a pool
10 feet
The minimum point of attachment of overhead service conductors to a building shall not be less than ___ feet above the finished grade
10 feet
The vertical clearance of final spans of overhead service conductors above, or within __ feet measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained in accordance with 230.24(B)
10 feet
Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than ___
12 AWG
Overhead service conductors shall have a minimum of ___ feet vertical clearance from final grade over residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground
12 feet
The minimum clearance for overhead service conductors not exceeding 600V that pass over commercial areas subject to truck traffic is ___ feet
18 feet
If a set of 120/240V overhead service conductors terminate at a through the roof raceway or approved support, with less than 6 feet of these conductors passing over the roof overhang, the minimum clearance above the roof for these service conductors shall be
18 inches
Service conductors installed as unjacketed multi-color cable shall have a minimum clearance of __ feet from windows that are designed to be opened, doors, porches, balconies, ladders, fire escapes, or similar locations
3 feet
Underground service conductors shall be protected from damage in accordance with ___ including minimum cover requirements
300.5
Service entrance cables mounted in contact with a building shall be supported at intervals not exceeding ___feet
4 feet
There shall be no more than ___ service disconnects installed for each service or for set of service entrance conductors as permitted in 230.2 and 230.40
6
Underground copper service conductors shall not be smaller than ___ AWG copper
8 AWG copper
Overhead service conductors installed over roofs shall have a vertical clearance of not less than ___ feet above the roof surface, unless a lesser distance is permitted by an exception
8 feet
The minimum size service drop conductor permitted is ___ AWG copper or ___ AWG aluminum or copper-clad aluminum
8AWG copper, 6 AWG aluminum
Grounding electrode conductors or supply side bonding jumpers or conductors shall not be permitted within raceways containing service conductors [True or False]
False
Overhead service conductors or service equipment can be supported to hardwood trees [True or False]
False
Where conduits are used as service masts, hubs shall be ___ for use with service equipment
Identified
Individual meter socket enclosures shall not be considered service equipment but shall be ___ for the voltage and ampacity of the service
Listed
Meter sockets supplied by and under the exclusive control of an electric utility shall not be required to be ___ in accordance with 230.66
Listed
The service disconnecting means rated 1000V or less shall be marked to identify it as being suitable for use as service equipment and shall be ___
Listed
Each service disconnecting means shall be permanently ___ to identify it as a service disconnect
Marked
On a 3 phase, 4 wire, delta connected service where the midpoint of one of the phase winding is grounded, the ground shall be durably and permanently marked by an outer finish that is ___ in color, or by other effective means at each termination or junction point
Orange
A service disconnecting means shall be installed at a ___ location
Readily accessible
Service entrance conductors can be spliced or tapped by clamped or bolted connections at any time as long as:
The free ends of conductors are covered with an insulation that is equivalent to that of the conductors or with an insulating device identified for the purpose wire connectors or other splicing means installed on conductors that are buried in the earth are listed for direct burial, and no splice is made in a raceway
The requirements to maintain a 3 foot vertical clearance from the edge of a roof does not apply to the final conductor span where the service drop is attached to ___
The side of the building, below the roof
A one family dwelling unit and its accessory structure(s) shall be permitted to have one set of service entrance conductors run to each structure from a single service drop, set of overhead service conductors, set of underground service conductors, or service lateral
True
A service disconnecting means shall not be installed in a bathroom [True or False]
True
If the voltage between overhead service conductors does not exceed 300V and the roof area is guarded or isolated, a reduction in clearance to 3 feet is permitted [True or False]
True
One set pf service entrance conductors connected to the supply side of the normal service disconnecting means shall be permitted to supply standby power systems, fire pump equipment, and fire and sprinkler alarms covered by 230.82(5)
True
Service conductors installed in overhead masts on the outside surface of the building traveling through the eave, but not the wall, of that building are considered to be outside of the building [True or False]
True
Service conductors shall not be installed beneath openings through which materials may be moved and shall not be installed where they will obstruct entrance to these buildings openings [True or False]
True
Two family dwellings, a multifamily dwelling, and multiple occupancy buildings shall be permitted to have one set of service entrance conductors to supply branch circuits for public or common areas
True
Underground service entrance conductors shall be protected against physical damage [True or False]
True
Where a building or structure is supplied by more than one service, a permanent plaque or directory shall be installed at each service disconnect location denoting all other services supplying that building or structure and the area served by each [True or False]
True
Where a remote control device actuates the service disconecting means, the service disconnecting means shall still be at a readily accessible location either outside the building or structure, or nearest the point of entry of the service conductor [True or False]
True
Cable trays used to support service entrance conductors shall contain only service entrance conductors, unless___
a solid fixed barrier separate the service entrance conductors from other conductors
Conductors are considered outside a building when they are installed:
a) under no less than 2 inches of concrete beneath a building b) within a building within a raceway encased in not less than 2 inches of concrete or brick c) in a vault that meets the construction requirements of article 450 part 3 d) in a raceway not less than 18 inches below a building e)within a rigid or intermediate metal conduit that passes directly through an eave but not the wall of a building
Service heads on raceways or service entrance cables and goosenecks in service entrance cables shall be located ___ the point of attachment, unless impracticable
above
Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for
different electricity rate schedules
Service conductors passing over a roof shall be securely supported by substantial structures, and for a grounded system, where the substantial structure is ___, it shall be bonded by means of a bonding jumper and listed connector to the grounded overhead service conductor.
metal
Wiring methods permitted for service entrance equipment include:
mineral-insulated cable, electrical metallic tubing, liquid-tight nonmetallic conduit
The general requirement for each service drop, set of overhead service conductors, set of underground service conductors, or service lateral is that it shall supply ___ set(s) of service entrance conductors
only one set
Service entrance cables which are not installed underground, where subject to physical damage, shall be protected by
rigid metal conduit, intermediate metal conduit, schedule 80 PVC conduit, electrical metallic tubing, and or other approved means
Overhead service entrance cables shall be equipped with a ___
service drop
Additional services shall be permitted for a single building or other structure sufficiently large to make 2 or more services necessary if permitted by
special conditions, special occupancies, capacity requirements, different charges
Where a service raceway enters a building or structure from ____, it shall be sealed in accordance with 300.5
underground
Each service disconnecting means shall be suitable for ___
use as service equipment
Service entrance and overhead service conductors shall be arranged so that ___
water shall not enter the service raceways or equipment
