Kentucky Masters exam Electric Exam with accurate ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
detailed solutions ||\\//||
A 120 volt road sign has #6 copper THWN conductors in a 2" PVC conduit. The sign pulls 8
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
amps and is on a 30 amp breaker. what is the longest distance that the sign can be located
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
from the sub-panel and still be legal? Use k = 12.9
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
a. 100-200 feet ||\\//|| ||\\//||
b. 201-300 feet ||\\//|| ||\\//||
c. 301-400 feet ||\\//|| ||\\//||
d 401-500 feet - correct answer✔✔d. 401-500
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A 175 KVA, single phase transformer having a primary voltage of 240 and a secondary
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
voltage of 120 has been installed at a multi-family dwelling. The current available at the
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primary is ___. ||\\//|| ||\\//||
Select one: ||\\//||
a. 329 amps ||\\//|| ||\\//||
b. 421 amps ||\\//|| ||\\//||
c. 625 amps ||\\//|| ||\\//||
d. 729 amps - correct answer✔✔d. 729 amps
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A 240 volt, 20 amp circuit may supply ___ linear feet of electric baseboard heat. Baseboard
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
heaters being used are rated 240 volts, 250 watts per linear foot.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 12 ||\\//||
b. 15 ||\\//||
,c. 16
||\\//||
d. 18 - correct answer✔✔b. 15
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A 45 kVA 3 phase transformer has 480/277 volts on the primary and 208/120 volts on the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
secondary. If the secondary side is pulling 47 amps, how many amps will the primary pull? ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 20
||\\//||
b. 54
||\\//||
c. 94
||\\//||
d. 125 - correct answer✔✔a. 20
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A bare #4 conductor may be concrete encased and serve as the grounding electrode when
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
at least ___ feet in length.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 10
||\\//||
b. 12
||\\//||
c. 20
||\\//||
d. 15 - correct answer✔✔c. 20
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A cabinet or cutout box if constructed of sheet steel, the metal thickness shall not be less
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
than ___ inch uncoated.
||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 0.053
||\\//||
b. 0.503
||\\//||
c. 0.040
||\\//||
d. 0.373 - correct answer✔✔a. 0.053
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, A device box contains four #10 conductors and four #12 conductors. Assuming each
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
conductor carries current, for the purposes of determining box fill, these conductors are
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
equivalent to ___ cubic inches. ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 17
||\\//||
b. 18
||\\//||
c. 19
||\\//||
d. 20 - correct answer✔✔c. 19
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A ground rod is required to be driven a MINIMUM of ___ feet into the soil.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 4
||\\//||
b. 6
||\\//||
c. 8
||\\//||
d. 10 - correct answer✔✔c. 8
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A lighting fixture shall be supported independently of the outlet box when it weighs more
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
than ___ pounds unless the outlet box is listed for the weight to be supported.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 6
||\\//||
b. 25
||\\//||
c. 35
||\\//||
d. 50 - correct answer✔✔d. 50
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A one-family dwelling unit that is at grade level shall have ___ outdoors.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. one receptacle at either the front or the back
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
detailed solutions ||\\//||
A 120 volt road sign has #6 copper THWN conductors in a 2" PVC conduit. The sign pulls 8
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amps and is on a 30 amp breaker. what is the longest distance that the sign can be located
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
from the sub-panel and still be legal? Use k = 12.9
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
a. 100-200 feet ||\\//|| ||\\//||
b. 201-300 feet ||\\//|| ||\\//||
c. 301-400 feet ||\\//|| ||\\//||
d 401-500 feet - correct answer✔✔d. 401-500
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A 175 KVA, single phase transformer having a primary voltage of 240 and a secondary
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
voltage of 120 has been installed at a multi-family dwelling. The current available at the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
primary is ___. ||\\//|| ||\\//||
Select one: ||\\//||
a. 329 amps ||\\//|| ||\\//||
b. 421 amps ||\\//|| ||\\//||
c. 625 amps ||\\//|| ||\\//||
d. 729 amps - correct answer✔✔d. 729 amps
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A 240 volt, 20 amp circuit may supply ___ linear feet of electric baseboard heat. Baseboard
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
heaters being used are rated 240 volts, 250 watts per linear foot.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 12 ||\\//||
b. 15 ||\\//||
,c. 16
||\\//||
d. 18 - correct answer✔✔b. 15
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A 45 kVA 3 phase transformer has 480/277 volts on the primary and 208/120 volts on the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
secondary. If the secondary side is pulling 47 amps, how many amps will the primary pull? ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 20
||\\//||
b. 54
||\\//||
c. 94
||\\//||
d. 125 - correct answer✔✔a. 20
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A bare #4 conductor may be concrete encased and serve as the grounding electrode when
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
at least ___ feet in length.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 10
||\\//||
b. 12
||\\//||
c. 20
||\\//||
d. 15 - correct answer✔✔c. 20
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A cabinet or cutout box if constructed of sheet steel, the metal thickness shall not be less
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
than ___ inch uncoated.
||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 0.053
||\\//||
b. 0.503
||\\//||
c. 0.040
||\\//||
d. 0.373 - correct answer✔✔a. 0.053
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, A device box contains four #10 conductors and four #12 conductors. Assuming each
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
conductor carries current, for the purposes of determining box fill, these conductors are
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
equivalent to ___ cubic inches. ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 17
||\\//||
b. 18
||\\//||
c. 19
||\\//||
d. 20 - correct answer✔✔c. 19
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A ground rod is required to be driven a MINIMUM of ___ feet into the soil.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 4
||\\//||
b. 6
||\\//||
c. 8
||\\//||
d. 10 - correct answer✔✔c. 8
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A lighting fixture shall be supported independently of the outlet box when it weighs more
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
than ___ pounds unless the outlet box is listed for the weight to be supported.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. 6
||\\//||
b. 25
||\\//||
c. 35
||\\//||
d. 50 - correct answer✔✔d. 50
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A one-family dwelling unit that is at grade level shall have ___ outdoors.
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Select one: ||\\//||
a. one receptacle at either the front or the back
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
