Commercial Wiring - Part 1
17 Questions
| Total Attempts: 695
This Quiz is created to quantify commercial electric wiring and its terms, talking about Prints, load calculations, branch circuits, switches and receptacles and box calculations
Questions and Answers
- 1.What is wet location?
- 2.What section of the specification contains a list of contract documents?
- A.
Specifications blog
- B.
General conditions
- C.
Electrical Layouts
- D.
Symbol Schedule
- 3.The requirements for temporary light and power at the job site will be found in what portion of the specification?
- A.
Supplementary general condition
- B.
Elevations
- C.
Details
- D.
Site plan
- 4.A Standard Ampere rating for fuse and fixed trip circuit breaker is ..?
- A.
12
- B.
20
- C.
45
- D.
33
- E.
62
- 5.What is the correct unit load according to table 220.12 NEC for a schoolroom and corridor school?
- A.
3 VA/sqft
- B.
0.5 VA/sqft
- C.
1 VA/sqft
- D.
3 1/2 VA/sqft
- E.
3 VA/Sqm
- 6.Can an increase in the nonlinear load affect on FEEDERS serving the area?
- A.
Yes
- B.
No
- 7.A School Building has 80 ft x 50 ft. with 4 classrooms, each 40 ft x 20 ft, and a corridor that is 80x 10 ft wide. Each classroom has: 12 fluorescent 2ft by 4 ft @ 85 VA each, 20 duplex receptacles, 1 AC unit 208v, 1 phase @ 5000VA. Corridor: 5 fluorescent 1 ft x 8 ft @ 85 VA each, 8 duplex receptacles. The calculated load is ?
- A.
10000
- B.
11485
- C.
9000
- D.
12000
- 8.What THHN stands for?
- 9.Current-carrying conductors for purpose of derrating are the followings?
- A.
All the current carrying wires
- B.
Neutral of a 3-wire single phase circuit when the circuit is taken from a 4 wire, 3 phase wye system
- C.
Equipment grounding conductors
- D.
Neutral of 3 wire system , when neutral carries only unbalanced current
- 10.The metal yoke of an isolated grounding type receptacle is connected to the green equipment grounding terminal of the receptacle?
- A.
True
- B.
False
- 11.What is the maximum number of 6 AWG THW copper conductors permitted in a 1 in EMT?
- A.
4
- B.
5
- C.
6
- D.
3
- 12.Two “A” phase conductors, two “B” phase conductors, and two neutrals of a 120/208 V system are installed in an area with an ambient temperature installed of 30C. The conductors are 10 AWG THHN copper. What is the allowable ampacity of each current carrying conductor?
- A.
32
- B.
30
- C.
40
- D.
20
- 13.Determine the allowable ampacity of six 8 AWG THW copper conductors installed in EMT, in an ambient temperature of 30 C. All are current carrying conductors
- A.
40
- B.
30
- C.
45
- D.
50
- 14.What is the ampacity of a 1AWG THW copper conductor installed in a raceway in a location with the following ambient temperature? 55 C ambient temperature
- A.
87.1
- B.
90.1
- C.
100.1
- D.
80.1
- 15.A conductor’s ampacity is directly related to the type of insulation used on the conductor?
- A.
True
- B.
False
- 16.Identify the following items as a device or fitting. a) Bushing: Device Fitting
- A.
Device
- B.
Fitting
- 17.Table 310.16 lists the ampacity of a 10 AWG THHN copper conductor at _____ amps, but section 240.4 (D)(7) limits the overcurrent protection to ______ ?
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