Article 310, CONDUCTORS FOR GENERAL WIRING
Each current-carrying conductor of a parallel set of conductors shall be counted as a current-carrying conductor for the purpose of applying the adjustment factors of 310.15(B)(3)(a) (a) True (b) False
(A) True
For one-family dwellings and the individual dwelling units of two-family and multifamily dwellings, single-phase feeder conductors consisting of ________ ungrounded conductor(s) and the neutral conductors from a 208/120 volt system shall be permitted to be sized in accordance with 310.15(B)(7)(1) through (3) (a) 1 (b) 2 (c) 3 (d) 4
(B) 2
Conductor adjustment factors shall not apply to conductors in raceways having a length not exceeding _______. in (a) 12 (b) 24 (c) 36 (d) 48
(B) 24
The _______ rating of a conductor is the maximum temperature, at any location along its length, which the conductors can withstand over a prolonged period of time without serious degradation. (a) ambient (b) temperature (c) maximum withstand (d) short-circuit
(B) TEMPERATURE
The ampacities listed in 310.15 do not take _______ into consideration (a) continuous loads (b) voltage drop (c) insulation (d) wet locations
(B) VOLTAGE DROP
Type _______ insulated conductors shall not be subject to the ampacity adjustment provisions of 310.15(B)(3)(c). (a) THW-2 (b) XHHW-2 (c) THWN-2 (d) RHW-2
(B) XHHW-2
Where six current-carrying conductors are run in the same conduit or cable, the ampacity of each conductor shall be lowered to ______ percent of its ampacity (a) 40 (b) 60 (c) 80 (d) 90
(C) 80
There are principal determinants of conductor operating temperature, one of which is ______ generated internally in the conductor as the result of load current dole, including fundamental and harmonic currents. (a) friction (b) magnetism (c) heat (d) none of these
(C) HEAT
In general, the minimum size conductor permitted for use in parallel installations is _______ AWG. (a) 10 (b) 4 (c) 1 (d) 1/0
(D) 1/0
Sectioned equipment grounding conductors smaller than _____ AWG shall be permitted in multi conductor cables, if the combined circular mill area of the sectioned equipment grounding conductors in each cable complies with 250.122. (a) 3 (b) 2 (c) 1 (d) 1/0
(D) 1/0
If cables meeting the requirements in 310.15(B)(3)(4)a through c with more than 20 current carrying conductors are installed longer than 24 in. without maintaining spacing, are stacked or are supported on bridle rings, a _______percent adjustment factor shall be applied (a) 30 (b) 40 (c) 50 (d) 60
(D) 60
Where conductors are installed in raceways or cables exposed to direct sunlight on or above rooftops, a temperature adder of _______℉ shall be added to the outdoor temperature where the conduit are less than ⅞in. from the rooftop. (a) 30 (b) 40 (c) 50 (d) 60
(D) 60
Conductors smaller than 1/0 AWG can be connected in parallel to supply control power, provided ______. (a) they are all contained within the same raceway or cable (b) each parallel conductor has an ampacity sufficient to carry the entire load (c) the circuit overcorrect device rating goes not exceed the ampacity of any individual parallel conductor (d) all of these
(D) ALL OF THESE
Parallel conductors shall have the same _______ (a) length (b) material (c) size in circular mil area (d) all of these
(D) ALL OF THESE
Where correction or adjustment factors are required by 310.15(B)(2) or (3), for single phase feeder conductors installed for ______dwellings, they shall be permitted to be applied to the ampacity associated with the temperature rating of the conductor. (a) one-family (b) the individual dwelling units of two-family (c) the individual dwelling units of multifamily (d) all of these
(D) ALL OF THESE
Insulated conductors used in wet locations shall be _________ (a) moister-impervious metal-sheathed (b) MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THWN, THWN-2, XHHW, XHHW-2, or ZW (c) listed for wet locations (d) any of these
(D) ANY OF THESE
The minimum size copper conductor permitted for branch circuits under 600V is ______ AWG. (a) 14 (b) 12 (c) 10 (d) 8
(A) 14
Conductors shall be permitted for use in any of the wiring methods recognized in Chapter 3 and as permitted in the NEC (a) True (b) False
(A) TRUE
No conductor shall be used where its operating temperature exceeds that designated for the type of insulated conductor involved. (a) True (b) False
(A) TRUE
On a three-phase, 4-wire, wye circuit, where the major portion of the load consists of nonlinear loads, the neutral conductor shall be counted when applying 310.15(B)(3)(a) adjustment factors. (a) True (b) False
(A) TRUE
The service or feeder ratings addressed by 310.15(B)(7) are based on the standard ampacity ratings from 240.6(A) (a) True (b) False
(A) TRUE
When determining the number of current-carrying conductors, a grounding or bonding conductor shall not be counted when applying the provisions of 310.15(B)(3)(a) (a) True (b) False
(A) TRUE
Where conductors in parallel are run in separate raceways, the raceways shall have the same electrical characteristics. (a) True (b) False
(A) TRUE
Where installed in raceways, conductors _________ AWG and larger shall be stranded, unless specifically permitted or required elsewhere in the NEC. (a) 10 (b) 8 (c) 6 (d) 4
(B) 8
The ampacity adjustment factors of Table 310.15(B)(3)(a) do not apply to Type AC or Type MC cable without overall outer jacket, if which of the following condition(s) is(are) met? (a) Each cable has not more than three current-carrying conductors (b) The conductors are 12 AWG copper (c) No more than 20 current-carrying conductors are installed without maintaining spacing (d) all of these
(D) ALL OF THESE
A(n) ________ conductor that carries only the unbalanced current from other conductors of the same circuit shall not be required to be counted when applying the provisions of 310.15(B)(3)(a) (a) neutral (b) ungrounded (c) grounding (d) none of these
(A) NEUTRAL
When bare conductors are installed with insulated conductors, their ampacities shall be limited to ________ (a) 60℃ (b) 75℃ (c) 90℃ (d) the lowest temperature rating for any of the insulated conductors
(D) THE LOWEST TEMPERATURE RATING FOR ANY OF THE INSULATED CONDUCTORS
Where raceways or cables are exposed to direct sunlight on or above rooftops, raceways or cable shall be installed a minimum distance of ______in. above the roof of the bottom of the raceway or cable (a) ¼ (b) ⅓ (c) ½ (d) ⅞
(D)⅞
