Article 215
Feeders
Feeders
The minimum feeder conductor ampacity shall be no less than the noncontinuous load plus _____ percent of the continuous load, and not less than the maximum load after the application of adjustment and correction factors.
125% (215.2(A)(1)(a))))
Unless otherwise specified, for purposes of calculating branch-circuit and feeder loads, nominal system voltages of 120, 120/240, 208Y/120, 240, 347, 480Y/277, 480, 600Y/347, and 600 volts are to be used. True or False?
True (220.5(A))
Open individual conductors shall not be smaller than _____ AWG copper for spans up to 50 ft in length and _____ AWG copper for a longer span, unless supported by a messenger wire.
10, 8 (225.6(A)(1) )
Overhead service conductors installed over roofs shall have a vertical clearance of not less than _____ ft above the roof surface, unless a lesser distance is permitted by an exception.
8 (230.24(A) )
A conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the ampacity permitted for similar conductors is known as a _____.
tap conductor (240.2 Tap Conductor)
Where a portion of a feeder is connected at both its supply and load ends to separately installed pressure connections in accordance with 110.14(C)(2), it shall be permitted to have an allowable ampacity _____ the sum of the continuous load plus the noncontinuous load.
not less than (215.2(A)(1)(a) Ex 2 ))))
When calculations in Article 220 result in a fraction of an ampere that is less than _____, such fractions can be dropped.
0.50 (220.5(B))
Where a mast is used for overhead branch-circuit or feeder conductor support, it shall have adequate strength or be supported by braces or guys to safely withstand the strain imposed by the conductors. True or False?
True (225.17(A) )
The minimum point of attachment of overhead service conductors to a building shall not be less than _____ ft above finished grade.
10 (230.26)
If the circuit's overcurrent device exceeds _____, the conductor ampacity shall have a rating not less than the rating of the overcurrent device.
800A (240.4(C))
Feeder conductors shall be permitted to be sized at 100 percent of the continuous and noncontinuous load where a portion of the feeder is connected at both its supply and load ends to separately installed pressure connections. True or False?
True (215.2(A)(1)(a) Ex 2 ))))
The 3 VA per sq ft general lighting load for dwelling units does not include _____.
unused or unfinished spaces not adaptable for future use (220.11)
The requirement for maintaining a 3-foot vertical clearance from the edge of the roof shall not apply to the final feeder conductor span where the conductors are attached to _____.
the side of a building (225.19(A) Ex 4 )
Underground service conductors shall have _____.
adequate mechanical strength and sufficient ampacity for the loads calculated (230.31(A))
Supplementary overcurrent protection _____.
may be used to protect internal circuits of equipment (240.10)
Where a premises wiring system contains feeders supplied from more than one nominal voltage system, each ungrounded conductor of a feeder shall be identified by phase or line and system by _____, or other approved means.
color coding, marking tape, or tagging (215.12(C)(1)(a))))
Show window loads are permitted to be calculated at 180 VA per linear ft of show window. True or False?
False (220.14(G) (1) and (2), 220.14(L) )
A building or structure shall be supplied by a maximum of _____ feeder(s) or branch circuit(s), unless specifically permitted otherwise.
one (225.30)
Service entrance conductors shall be continuous and are not permitted to be spliced or tapped. True or False?
False (230.46)
Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 1,000V phase-to-phase for each individual device used as a building or structure main disconnecting means rated _____ or more, unless specifically exempted.
1000A (240.13)
Feeder equipment grounding conductors that are insulated or covered _____ AWG and larger, shall be permitted, at the time of installation, to be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible.
4 (215.12(B), 250.119(A)(1))
Where a building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load is permitted to be calculated using the unit values specified in the energy code if a _____.
continuous power monitoring system is installed, power monitoring system is installed with alarm values to alert personnel when the lighting load exceeds the energy code values and can provide to automatically reduce the connected load, continuous load multiplier of 125 percent is applied (220.12(B)(1), (2), and (4)))
Overhead feeder conductors shall have a minimum vertical clearance of _____ ft over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage does not exceed 300 volts-to-ground.
12 (225.18(2))
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, or by other effective means, at each termination or junction point.
orange (230.56)
When taps are not over 10 ft in length for field installations, and they leave the enclosure or vault in which the tap is made, the ampacity of the tap conductors cannot be less than _____ the rating of the device protecting the feeder.
1/10 (240.21(B)(1)(4))