Wiring Methods #1
What is the term used in the CEC to describe any channel designed for holding wires, cables or bus bars?
Raceway
What is the term for the point in the wiring installation at which current is taken to supply utilization equipment?
Outlet
Which table provides the minimum bend radius for conduit and tubing?
Table 7
Which table lists the number of conductors determining box fill?
Table 23
12-3034
Can conductors of difference sources of voltage be contained in the same raceway?
No. 12-904 2)
Section 12 of the CEC deals with wiring methods for installations of _____ V or less.
750
12-000
What is the minimum thickness of concrete slab at grade level to permit raceways to be installed directly beneath it?
100mm
12-012 8)
The maximum number of bends in a conduit must not exceed _____ degrees.
360
12-942What is the maximum number of outlets that may be installed on a 15A branch circuit in a dwelling unit where the breaker is rated for 80%?
12
8-304
Cutting oil is an acceptable lubricant that can be used to ease the passage of conductors through raceways. True or False.
False. 12-908
What is the smallest size of rigid conduit that may be used in an electrical installation?
16
12-1004
What is the maximum spacing between the points of support for a single 16 trade size rigid PVC conduit?
0.75m
12-1114
What is the maximum number of conductors that may be installed in a conduit?
200
12-910
When calculating box fill, 3 marettes/splice caps would be equivalent to how many insulated conductors?
1
Recall it is 1 conductor per PAIR of marettes (12-3034)
What is the maximum length for runs of 12 trade size flexible conduit?
1.5m (12-1004)
What is the largest size SOLID conductor that may be pulled into conduit?
#10
12-914
The minimum bending radius of armored cables is _____ times the external diameter of the cable.
6
12-614
NMSC shall not be used where voltage between any 2 conductors exceeds _____ V.
300V
12-502
What is the minimum length of free conductor to be left at every outlet box?
150mm
12-3000 6)
Rigid PVC conduit shall not be used where normal conditions are such that any part of the conduit is subjected to ambient temperatures above _____C?
75C. 12-1104
If junction boxes are placed in attic spaces, what is the minimum vertical access height?
900mm
12-3014
What does NMWU stand for as it pertains to cables?
Non Metallic Wet Underground
What is the maximum number of #12 AWG, 600V, RW90XLPE stranded, unjacketed conductors in a 78 trade size EMT?
Table 10 -> 11.61mm2 per conductor
Table 9G -> assume 40% fill -> 2280.49
2280.49/11.61 = 196 conductors
What is the correct method of terminating aluminum conductors to binding terminal screws?
End of the conductor wrapped 3/4 around the screw in a clockwise direction.
12-118 6)
What is the maximum number of 0.5A buzzers that could be connected to a single 15A branch circuit?
80% of 15A = 12A
12/0.5 = 24