KENTUCKY MASTERS EXAM
ELECRIC STUDY NOTES, PROBLEM
SETS & NEC UPDATES (2025)
d. 401-500 - correct answers ✔✔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
, d. 729 amps - correct answers ✔✔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
b. 15 - correct answers ✔✔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
a. 20 - correct answers ✔✔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
c. 20 - correct answers ✔✔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
a. 0.053 - correct answers ✔✔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
c. 19 - correct answers ✔✔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.
ELECRIC STUDY NOTES, PROBLEM
SETS & NEC UPDATES (2025)
d. 401-500 - correct answers ✔✔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
, d. 729 amps - correct answers ✔✔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
b. 15 - correct answers ✔✔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
a. 20 - correct answers ✔✔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
c. 20 - correct answers ✔✔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
a. 0.053 - correct answers ✔✔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
c. 19 - correct answers ✔✔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.
