1. Given: after all demand factors have been taken into consideration for an
office building, the demand load is determined to be 90,000 VA; the building
has a 120/240-volt, single phase electrical system. What MIN. size copper
conductors with THHN/THWN insulation are required for the ungrounded ser-
vice-lateral conductors? Consider all termination lugs are rated for 75 deg. C.
A. 400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil: D. 500 kcmil
pg. 142, 153, 161
2. Given: a commercial building is to be supplied from a transformer having
a 480Y/277-volt, 3 phase primary and a 208Y/120-volt, 3 phase secondary. The
secondary will have a balanced computed demand load of 416 amperes per
phase. The transformer is required to have a MIN kVA rating of .
A. 100 kVA
B. 150 kVA
C. 86 kVA
D. 200 kVA: B. 150 kVA
3. Manhole covers shall be OVER or otherwise designed to require the
use of tools to open.
A. 25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs: D. 100 lbs
pg. 57
,4. The branch circuit conductors supplying one or more units of information
technology equipment shall have an ampacity of NOT less than of the
connected load.
A. 80%
B. 100%
C. 115%
D. 125%: D. 125%
pg. 547
5. In regard to a 7.5 hp, 480-volt, 3 phase ac motor with an 80% power factor
and a full-load ampere rating of 19 amperes indicated on the nameplate, and a
, service factor of 1.15; when the initial setting of the overload device you have
selected is not sufficient to carry the load, what is the MAX. setting permitted
for the overload protection?
A. 21.85 amperes
B. 23.75 amperes
C. 24.7 amperes
D. 26.6 amperes: D. 26.6 amperes
pg. 309, 316
6. The ampacity adjustment factors for conductors addressed in Section
310.15(C)(1) of the NEC are not required to be applied when the conductors
are installed in a metal wireway unless, the number of current-carrying con-
ductors within the wireway exceeds at least at any cross-section area of
the wireway.
A. 20
B. 30
C. 35
D. 24: B. 30
pg. 229
7. What MIN. voltage is require after 1.5 hours to serve emergency lighting
from a storage battery when the normal source voltage of 120 volts is inter-
rupted?
A. 60 volts
B. 90 volts
C. 105 volts
D. 120 volts: C. 105 volts
pg. 609
8. Determine the MAX. ampere setting permitted for an overload protective
device responsive to motor current, where used to protect a 20 hp, 240-volt, 3
phase, induction type ac motor with a temperature rise of 48 deg. C and a FLA
of 54 amperes indicated on the nameplate.
A. 54 amperes
B. 70.2 amperes
C. 62.1 amperes
D. 75.6 amperes: B. 70.2 amperes
pg. 309, 316
office building, the demand load is determined to be 90,000 VA; the building
has a 120/240-volt, single phase electrical system. What MIN. size copper
conductors with THHN/THWN insulation are required for the ungrounded ser-
vice-lateral conductors? Consider all termination lugs are rated for 75 deg. C.
A. 400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil: D. 500 kcmil
pg. 142, 153, 161
2. Given: a commercial building is to be supplied from a transformer having
a 480Y/277-volt, 3 phase primary and a 208Y/120-volt, 3 phase secondary. The
secondary will have a balanced computed demand load of 416 amperes per
phase. The transformer is required to have a MIN kVA rating of .
A. 100 kVA
B. 150 kVA
C. 86 kVA
D. 200 kVA: B. 150 kVA
3. Manhole covers shall be OVER or otherwise designed to require the
use of tools to open.
A. 25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs: D. 100 lbs
pg. 57
,4. The branch circuit conductors supplying one or more units of information
technology equipment shall have an ampacity of NOT less than of the
connected load.
A. 80%
B. 100%
C. 115%
D. 125%: D. 125%
pg. 547
5. In regard to a 7.5 hp, 480-volt, 3 phase ac motor with an 80% power factor
and a full-load ampere rating of 19 amperes indicated on the nameplate, and a
, service factor of 1.15; when the initial setting of the overload device you have
selected is not sufficient to carry the load, what is the MAX. setting permitted
for the overload protection?
A. 21.85 amperes
B. 23.75 amperes
C. 24.7 amperes
D. 26.6 amperes: D. 26.6 amperes
pg. 309, 316
6. The ampacity adjustment factors for conductors addressed in Section
310.15(C)(1) of the NEC are not required to be applied when the conductors
are installed in a metal wireway unless, the number of current-carrying con-
ductors within the wireway exceeds at least at any cross-section area of
the wireway.
A. 20
B. 30
C. 35
D. 24: B. 30
pg. 229
7. What MIN. voltage is require after 1.5 hours to serve emergency lighting
from a storage battery when the normal source voltage of 120 volts is inter-
rupted?
A. 60 volts
B. 90 volts
C. 105 volts
D. 120 volts: C. 105 volts
pg. 609
8. Determine the MAX. ampere setting permitted for an overload protective
device responsive to motor current, where used to protect a 20 hp, 240-volt, 3
phase, induction type ac motor with a temperature rise of 48 deg. C and a FLA
of 54 amperes indicated on the nameplate.
A. 54 amperes
B. 70.2 amperes
C. 62.1 amperes
D. 75.6 amperes: B. 70.2 amperes
pg. 309, 316
