BCES Prints
7. BCES specifications require ___" of separation be maintained between electrical conduits and plumbing pipe.
a. 8 b. 6 c. 2 d. 4 e. 3
What is "b"?- 6 inches
11. The following condition(s) must be met before ground-fault protection of equipment is required.
a. wye connected service
b. more than 150 volts to the ground
c. not exceeding 1000 volts between phases
d. all of these
What is "d"?- all of these conditions must be met before ground-fault protection of equipment is required.
(NEC 230.95)
22. Section 250.24(C)(1) requires that the ____ not to be smaller than the grounding electrode conductor.
a. ungrounded conductor b. grounded conductor
c. both of these d. neither of these
What is "b"?- ...requires that the grounded conductor not to be smaller...
16. The purpose of maintaining a low impedance fault-current return path is to ____.
a. drain static electricity to ground
b. direct lightning strikes to ground
c. quickly open an OCPD
d. all of these
e. none of these
What is "c"?- quickly open an OCPD
(NEC 250.4(A)(5))
24. Where a grounded service conductor is run in parallel conduits and is used as a circuit conductor, its minimum size is determined based on ____.
a. the size of the largest ungrounded conductor in each conduit
b. the load current that it will be required to carry
c. both a and b
d. neither a nor b
What is "c"?- both a and b
(NEC 250.24(C)(2))
49. BCES specs require that ground rods be at least ____ inch in diameter.
a. 3/4 b. 1 c. 1/2 d. 1 1/2 e. 1 1/4
What is "a"?- 3/4 inch in diameter
44. Isolated ground receptacles are identified by a(n)_______________.
a. red triangle b. orange triangle
c. green dot d. red color
What is "b"?- orange triangle
(NEC 406.3(D))
32. A ____ AWG grounding electrode conductor to building steel is required where the service-entrance conductors are 600 kcmil AWG and are terminated in a 600-A safety switch fused a 450 A.
a. 1/0 b. 4 c. 2 d. 2/0 e. 1
What is "a"?- A 1/0 AWG ...
(NEC 250.24(D)/NEC 250.66 (Table))
23. Grounded conductors run in parallel are subject to the same requirements as all other paralleled conductors (such as being joined at the ends to be electrically continuous). The parallel conductor requirements for ground conductors are covered in ___.
a. Article 100 b. 250.24(C)(2)
c. 250.20 d. Chapter 9, Table 8
What is "b"?- NEC 250.24(C)(2)
50. Conduits installed in BCES duct banks are to be encased in red concrete. The concrete shall extend ____ inches beyond the bank, on all sides.
a. 6 b. 18 c. 24 d. 3 e. 4
What is "d"?- The concrete shall extend 3 inches beyond the bank, on all sides.
63. On the north wall in BCES Room B108, the depth of the lower cabinets (on the east end of the casework) is ____".
a. 14 b. 18 c. 24 d. 30 e. 36
What is "d"?- the depth of the lower cabinets is 30 inches
14. An overload can be excessive current caused by a fault (short circuit or ground fault).
a. True b. False
What is "b"- False
(NEC 100_Overload)
46. The equipment grounding conductor is permitted to be run separately from the circuit conductors when____.
a. a nongrounded-type receptacle is replaced
b. the branch circuit is less than 30 amperes
c. the equipment grounding conductor has the same insulation as the circuit conductors
d. installed in industrial establishments only
What is "a"- a nongrounded-type receptacle is replaced
(NEC 250.130)
25. ______ of the NEC is normally used to size the main bonding jumper.
a. Table 250.102(C)(1)
b. T 250.28(D)(1)
c. T 250.122
d. T 250.66
What is "a"?- Table 250.102(C)(1)
(NEC 250.28(D)(1))
58. As a consideration for the installation of boxes with plaster rings in the east wall of Room A125, the stud-to-finish dimension is _____.
a. 5/8" b. 1/2" c. 1 1/8"
d. 1 1/4" e. 1" f. 1 7/8"
What is "a"?- 5/8"
54. Area D at BCES is located to the ________ of
Area B.
a. south b. east c. north d. west
What is "b"?- Area D is located to the EAST of Area B
21. A 208/120-volt, 3-ph, 4-wire panelboard will be fed with one conduit. This service panel contains a 200-amp main breaker. The conductors supplying the service will consist of three 4/0 AWG ungrounded conductors (one for Aø, one for Bø, and one for Cø) plus a grounded conductor. The calculated neutral load is 90 amps. The smallest neutral that can be run is a ________ AWG.
a. 4 b. 2 c. 6 d. 8 e. 3
What is "b"?- The smallest neutral that can be run is a 2 AWG.
(4/0 is the largest ungrounded conductor in conduit=2AWG vs. 230.42(A) [90A load]= 3AWG)
41. Which types of metal-covered cable assemblies are required to have their metal coverings grounded?
a. AC b. MC c. MI d. all of these
What is "d"- All of these types of metal-covered cable assemblies are required
(NEC 250.86)
40. Section 250.97 requires a bonding jumper to be used to provide continuity around knockouts, except where the largest knockout is used or the enclosure is listed for use without bonding. This applies for circuits of which of the following voltage systems.
I. 120/240V, 1ø, 3-W II. 208Y/120V, 3ø, 4-W
III. 480Y/277V, 3ø, 4-W
a. I only b. II only c. III only d. I & II only
e. II & III only
What is "c"?- III only (480Y/277V, 3ø, 4-W)
(NEC 250.97)
53. Where drawn to scale of 1/4 inch=1 foot, a line with an actual length of 1 3/4 inches on a drawing represents _____.
a. 14'-0" b. 28'-0" c. 7'-0" d. 6'-0" e. 13"-0"
What is "c"?- 7 feet - 0 inches
60. When roughing in the 4-square outlet box, for the switch in BCES Room D106, the box should be set in the wall so that the center of the box is ____ above the originally poured, concrete floor level.
a. 4'-3" b. 3'-6" c. 3'-9" d. 3'-10"
e. 3'-4"
What is "c"?- 3'-9" above the originally poured, concrete floor level
(See explanation on answer key.)
29. A 1000-A, 120/240-volt, 3ø, 4-wire service is to be installed underground using 3 paralleled Schedule 40 PVC conduits. The service switch will be fused. The minimum size of the main bonding jumper for this service is _____ AWG or kcmil.
a. 1/0 b. 2/0 c. 3/0 d. 4/0 e. 300
What is "c"?- The minimum size of the main bonding jumper for this service is 3/0 AWG or kcmil.
(IA = 1000/3 = 333.3 amps = 400 kcmil
400 x 3 = 1200 kcmil
1200 x .125= 150 kcmil= 3/0 AWG)
35. Scenario 305-25
A 225 KVA, 480 delta to 208/120-volt, 3-ph, 4-w transformer is to be installed.
• One set of secondary conductors is installed from the transformer to a 400-A MB panelboard. There will be two parallel conduits to this 400-A panel. Each conduit will contain 4 each 3/0 conductors.
• A second set of secondary conductors is installed from the transformer to a 225-A MB panelboard. One conduit will be installed between this 225-amp panel and the transformer. The conduit will contain 4 each 4/0 conductors.
You have decided to “ground and bond” everything in the transformer enclosure.
*The smallest GEC you can run to the steel structure is ____.
a. 2 b. 3 c. 2/0 d. 1/0 e. 3/0
What is "d"?- 1/0
[2 x 3/0] + [1 x 4/0]= [2 x 167,800] + [1 x 211,600]= 547,200 cmils
547.2 kcmil= 1/0 AWG per T 250.66
45. When an isolated ground receptacle is installed in a metal box, a(n) ____ equipment grounding conductor is required for connection to the metal box.
a. insulated b. separate
c. bare copper d. oversized
What is "b"?- a separate equipment grounding conductor is required for connection to the metal box.
(NEC 250.96(B))
28. A 600-amp main breaker service panel will have a 225-A breaker installed in it to feed a 225-amp, 1ø, 3-wire main breaker panel. you will install three 4/0 conductors to the new panel. you will install a ____ AWG MBJ in this new 225-amp panel.
a. 2 b. 4 c. 3 d. none of these
What is "d"?- None of these
(To install an MBJ in this subpanel would be a Code violation.)