Articles 230 - 2008
Ground-fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts-to-ground, but not exceeding 600V phase-to-phase for each service disconnecting means rated ____ or more.
1,000A
Overhead service-drop conductors shall have a horizontal clearance of ____ from a pool.
10 ft.
The minimum point of attachment of the service-drop conductors to a building shall not be less than ____ above finished grade.
10 ft.
Service-lateral conductors that supply power to limited loads of a single branch circuit shall not be smaller than ____.
12 AWG copper
____ vertical clearance from final grade overService-drop conductors shall have a minimum of residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage is limited to 300 volts-to-ground.
12 ft.
Service-entrance conductors shall be sized not less than ____ percent of the continuous load, plus 100 percent of the noncontinuous load.
125
For installations that supply only limited loads of a single branch circuit, the service disconnecting means shall have a rating not less than ____ .
15A
The minimum clearance for service-drop conductors not exceeding 600V that pass over commercial areas subject to truck traffic is ____.
18 ft.
If a set of 120/240V service-drop conductors terminates at a through-the-roof raceway or approved support, with less than 6 ft of these conductors passing over the roof overhand, the minimum clearance above the roof for these service conductors shall be ____.
18 in.
Overhead service conductors to a building shall maintain a vertical clearance of final spans above, or within, ____ measured horizontally from the platforms, projections, or surfaces from which they might be reached.
3 ft.
Service conductors installed as unjacketed multi-conductor cable shall have a minimum clearance of ____ from windows that are designed to be opened, doors, porches, stairs, fire escapes, or similar locations.
3 ft.
Service cables mounted in contact with a building shall be supported at intervals not exceeding ____.
30 in.
Underground copper service-lateral conductors shall not be smaller than ____ AWG copper.
8
____ Service drops installed over roofs shall have a vertical clearance of above the roof surface, unless a lesser distance is permitted by an exception.
8 ft.
The minimum size service-drop conductor permitted is ____ AWG copper or ____ AWG aluminum or copper-clad aluminum.
8, 6
Overhead service conductors spans can be supported to hardwood trees.
False
A meter disconnect switch located ahead of service equipment must have a short-circuit current rating equal to or greater than the available short-circuit current and be capable of interrupting the load served. 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
Service disconnecting means shall not be installed in bathrooms. True or False?
True
Service heads shall be located ____ , unless impracticable.
above the point of attachment
Service-lateral conductors shall have ____. a. adequate mechanical strength b. sufficient ampacity for the loads calculated c. a and b d. none of these
c. a and b
As defined by 230.95, the rating of the service disconnect shall be considered to be the rating of the largest ____ that can be installed or the highest continuous current trip setting for which the actual overcurrent device installed in a circuit breaker is rated or can be adjusted.
fuse
Overhead Type SE cable can be formed in a ____ and taped with self-sealing weather-resistant thermoplastic.
gooseneck
When the service contains two to six service disconnecting means, they shall be ____ .
grouped
Where raceway-type service masts are used, all raceway fittings shall be ____ for use with service masts.
identified
In a multiple-occupancy building where electric service and electrical maintenance are provided by the building management under continuous building management supervision, the service disconnecting means can be accessible to authorized ____ only.
management personnel
Each service disconnecting means shall be permanently ____ to identify it as a service disconnect.
marked
A building or structure shall be supplied by a maximum of ____ service(s), unless specifically permitted otherwise.
one
On a three-phase, 4-wire, delta-connected service where the midpoint of one phase winding is grounded, the service conductor having the higher phase voltage-to-ground shall be durably and permanently marked by an outer finish that is ____ in color at each termination or junction point.
orange
Overhead service cables shall be equipment with a ____ .
service head
The additional service disconnecting means for fire pumps, emergency systems, legally required standby, or optional standby services, shall be installed remote from the one to six service disconnecting means for normal service to minimize the possibility of ____ interruption of supply.
simultaneous
Additional services shall be permitted for a single building or other structure sufficiently large to make two or more services necessary if permitted by
special permission
The requirement to maintain a 3 ft 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 a building
Where a service raceway enters a building or structure from a(n) ____, it shall be sealed in accordance with 300.5(G).
underground distribution system
Each ____ service conductor shall have overload protection.
ungrounded
Service-drop conductors and service-entrance conductors shall be arranged so that ____ will not enter the service raceway or equipment.
water
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 or structure in a raceway encased in not less than 2 in. thickness of concrete or brick c. installed a vault that meets the construction requirements of article 450 d. all of these
d. all of these
For installations consisting of not more than two 2-wire branch circuits, the service disconnecting means shall have a rating of not less than ____ .
30A
Underground service 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 disconnecting means, the service disconnecting means must still be at a readily accessible location either outside the building or structure, or nearest the point of entry of the service conductors. True or False?
True
Service-drop conductors shall have ____. a. sufficient ampacity to carry the load b. adequate mechanical strength c. a or b d. a and b
d. a and b
To prevent moisture from entering service equipment, service-entrance conductors shall ____ . a. be connected to service-drop conductors below the level of the service head b. have drip loops formed on the service-entrance conductors c. a or b d. a and b
d. a and b
Conductors other than service conductors shall not be installed in the same ____. a. service raceway b. service cable c. enclosure d. a or b
d. a or b
Wiring methods permitted for service-entrance conductors include____. a. rigid metal conduit b. electrical metallic tubing c. PVC conduit d. all of these
d. all of these
Service cables, where subject to physical damage, shall be protected by ____. a. rigid metal conduit b. IMC c. Schedule 80 PVC conduit d. any of these
d. any of these
Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses such as for____.
different rate schedules
Service conductors supplying a building or other structure shall not ____ of another building or other structure.
pass through the interior
When the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a ____ .
power supply failure
A service disconnecting means shall be installed at a ____ location.
readily accessible
In a multiple-occupancy building, each occupant shall have access to the occupant's ____ .
service disconnecting means
There shall be no more than ____ disconnects installed for each service or for each set of service-entrance conductors as permitted in 230.2 and 230.40.
six
