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MASTER ELECTRICIAN QUESTIONS AND ANSWERS
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MASTER ELECTRICIAN QUESTIONS AND ANSWERS
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MASTER ELECTRICIAN QUESTIONS AND ANSWERSA 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120
volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary
of the transformer? - Answers -180 amperes
Where a conductor is marked RHW-2 on the insulation what does the "-2" represent? -
Answers -The conductor has a maximum operating temperate of 90 degrees C.
For a grounded electrical system supplied by a feeder or branch circuit, the equipment
grounding conductor shall be sized in accordance with _____. - Answers -the
overcurrent protective device
For lighting systems operating at 30-volts or less, the output circuits of the power supply
are to
be rated for NOT more than _____. - Answers -25 amperes
Using the standard method of calculation, what is the demand, in kW, on the
ungrounded (line) service-entrance conductors of an apartment complex that has thirty-
five (35) electric ranges rated at 11.5 kW each? - Answers -50 kW
Where a service riser is installed in a wet location and contains THWN insulated
conductors, the wiring method used _____. - Answers -is permitted to be electrical
metallic tubing (EMT)
What is the MAXIMUM distance between supports for straight horizontal runs of trade
size 1½ in. threaded rigid metal conduit (RMC)? - Answers -14 feet
Overcurrent protection of transformers, of 600 volts or less, is required to be sized
_____. - Answers -in accordance with Table 450.3(B)
A thermal barrier shall be required if the space between the resistors and reactors, of
600 volts or less, and combustible material is LESS than _____. - Answers -12 inches
What percent of electrical supplied RV spaces in a recreational vehicle park must have
50-ampere, 125/250-volt receptacle outlets provided? - Answers -20 percent
What is the MINIMUM bend radius of trade size 4 in. rigid metal conduit (RMC) where
the bend is not made with a one-shot or full-shoe bender? - Answers -24 inches
Type AC cable shall NOT be used _____. - Answers -where embedded in plaster in wet
locations
Where portions of a cable, raceway or sleeve are known to be subjected to different
temperatures and where condensation is known to be a problem, the raceway or sleeve
shall _____. - Answers -be filled with an approved material
, What is the MINIMUM size 75º C copper service-entrance conductors required for a 200
ampere rated commercial service? Assume ambient temperature and the number of
current-carrying conductors in the raceway is not a consideration. - Answers -3/0 AWG
THW
Two (2) or more motors may be installed without individual overcurrent protection
devices if rated less than 1 hp each, and the full-load current rating of each motor does
NOT exceed _____ if they are on a 120-volt, 20-ampere branch circuit. - Answers -6
amperes
Where a listed packaged spa or hot tub is installed outdoors, the unit is permitted to be
cord-and-plug connected, provided the cord is NOT longer than _____ and protected by
a GFCI. - Answers -15 feet
In general, if a cablebus system is rated 95 amperes, the MAXIMUM allowable rating of
the overcurrent device used to protect the cablebus is _____. - Answers -100 amperes
A twenty-five (25) ft. long tap conductor tapped from a 100 ampere rated feeder
conductor, shall have an ampacity of NOT less than _____. - Answers -33.3 amperes
Disregarding exceptions, bonding between Class I locations and the point of grounding
for service equipment may be done by _____. - Answers -bonding jumpers
When an electrical service is required to have a grounded conductor present, what is
the smallest grounded conductor permitted for an electric service using size 1000 kcmil
copper ungrounded (phase) conductors? - Answers -2/0 AWG copper
A motel to be constructed will have two (2), 20-ampere, 120-volt branch circuits
provided for the exterior electric signs. Determine the demand load, in VA, for the
electric signs, on the feeder and service-entrance conductors. - Answers -3,000 VA
Luminaires shall be installed so that the adjacent combustible material is not subjected
to temperatures in excess of _____. - Answers -90 degrees C
An aluminum grounding electrode shall be _____. - Answers -prohibited
A panelboard is limited to 42 overcurrent protective devices where _____. - Answers -
the panelboard is a "split-bus" type panelboard
When rigid polyvinyl chloride conduit (PVC) is used to enclose conductors feeding a
wet-niche luminaire in a permanently installed swimming pool, a _____ insulated copper
grounding conductor shall be installed in this conduit, unless a listed low-voltage lighting
system not requiring grounding is used. - Answers -8 AWG
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