big one 21-40 Flashcards
Where communications wires and cables and electric light or power conductors are supported by the same pole and are run paralled to each other in span , the supply service drops of 0-750 volts running above and parallel to communications service drops shall have a minimum separation of_____inches at any point in the span, including the point of and at their attachment to the building, provided the nongrounded conductors are insulated and that a clearance of not less than____inches is maintained between the two services at the pole.
a. 12 /40
c. 30 /24
b. 18 /24
d. 24 /40
12 / 40
800.44 (A) (4)
Communications wires and cables shall have a vertical clearance of not less the ___feet from all points of roofs above which thay pass.
a. 12
c. 8
b. 10
d. 6
8 feet
800.44 (B)
MV cable rated 35 KV cannot be installed in :
a. Cable tray c. in raceways
b. wet locations d. none of the above
cable tray
328.10
When three resistors are connected in series, an amperage of ten amps is achieved. When an equal resistor is connected in paralled with the existing three resistors the ampere reading will?
a. Decreases c. Remains the same
b. Doubles d. Increase by 1/2
double
How many switches will be needed to control a light fixture from five different locations
a. 1-3 ways and 4- single poles
c. 3-4 ways and 1-5 way
b. 3-3 ways and 1- 4 way
d. 2-3ways and 3-4ways
2-3ways and 3-4ways
The grounding of communications wires should be run to the grounding electrode:
a. with splicies
c. using the looping system
b. in a straight line
d. using the 45 degree bends
straight line
800.100 (A) (5)
Service Lateral conductors that supply power to limited loads of a single branch circuit-such as a small poyphase power, controlled water heaters, and similar loads-shall not be smaller than_____.
a. 14 Awg. Copper
c. 10 Awg. Copper
b. 12 Awg. Copper
d. 8 Awg. Copper
10 AWG copper
230.23
overhead #8
load #12
230.21
lateral #4
load #10
Each general care area patient bed location shall be provided with a minimum of ____receptacle(s), which can be single, duplex, or a combination of both.
a. 2
c. 4
b. 8
d. 6
4
*critical care always higher
Dry type transformers installed indoors rated over________ shall be installed in a vault.
a. 25 KV
c. 20 KV
b. 35 KV
d. 50 KV
35KV
450.21
Flat top underfloor raceways over 4 inches, but less 8 incheswide, with a minimum 1 inch spacing between raceways, shall be covered with concrete to a depth of not less than 1inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of _____.
a. 1 inch
c. 2 1/2 inches
b. 1 3/4 inches
d. 1 1/2 inches
1-1/2 inches
390.3 (B)
For straight pulls, the length of a pull box shall not be less than ____time the outside diameter, over the sheath, of the largest shielded or lead covered conductor cable entering the box on systems over 600 volts.
a. 48
c. 8
b. 36
d. 6
48
314.28 app under 600 volts
314.70 junc box over 600 volts
For switchboards that are not totally enclosed, a space of ____or more shall be provided between toe top of the switchboard and any combustible ceiling.
a. 12 inches
c. 24 inches
b. 18 inches
d. 36 inches
36
408.18
A disconnecting means that serves a hermetic refrigerant motor compressor shall have an ampere rating of at least____percent of the nameplate rated load current or branch circuit selection current, whichever is greater.
a. 125 %
c. 115 %
b. 110 %
d. 250 %
115 %
440.12 (A) (1)
Knife switches rated for more than 1200 amps at 250 volts or less, and at over 600 amperes at 251 to 600 volts, shall be used only as
a. shall not be opened under load
c. shall be placed so that gravity tends to close them
b. Isolating Switches
d. A and B
D. A & B
404.13 (A)
Class 2 and class 3 cables listed as sutable for general purpose use with the exception of risers, ducts, plenums, and other spaces used for environmental air, shall be Tpye_______.
a. CL2P and CL3P
c. CL2 and CL3
b. CL2R and CL3R
d. PLTC
C. CL2 & CL3
725.179 (C)
