MASTER ELECTRICIAN'S EXAM PREP
GUIDE FINAL EXAM #1 QUESTIONS
AND ANSWERS
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 service-lateral conductors? Consider all
termination lugs are rated for 75 deg. C.
A. 400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil - Correct Answers -D. 500 kcmil
pg. 142, 153, 161
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 - Correct Answers -B. 150 kVA
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 - Correct Answers -D. 100 lbs
pg. 57
,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% - Correct Answers -D. 125%
pg. 547
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 - Correct Answers -D. 26.6 amperes
pg. 309, 316
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 conductors within the wireway exceeds
at least ____ at any cross-section area of the wireway.
A. 20
B. 30
C. 35
D. 24 - Correct Answers -B. 30
pg. 229
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 interrupted?
A. 60 volts
B. 90 volts
C. 105 volts
D. 120 volts - Correct Answers -C. 105 volts
pg. 609
One- and two-family dwelling unit services are required to be provided with:
I. an emergency service disconnect
II. a surge-protective device
A. I only
B. II only
C. Both I and II
, D. Neither I nor II - Correct Answers -C. Both I and II
pg. 93, 95
When supplying a 36,000 VA, 240-volt, single-phase load in an area where the ambient
temperature reaches 119 deg. F, determine the MIN, size 75 deg. C rated copper
conductors required to supply the load.
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 4/0 AWG - Correct Answers -C. 3/0 AWG
pg. 161, 159
Color coding shall be permitted to identify intrinsically safe conductors where they are
colored ____ and where no other conductors of the same color are used.
A. light blue
B. orange
C. yellow
D. purple - Correct Answers -A. light blue
pg. 388
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 - Correct Answers -B. 70.2 amperes
pg. 309, 316
Where Type SRD multiconductor cable consist of size 8 AWG conductors and only 2
conductors in the cable are current-carrying, what is the ampacity of the conductors?
A. 20 amperes
B. 30 amperes
C. 40 amperes
D. 50 amperes - Correct Answers -C. 40 amperes
pg. 251
Aluminum or steel cable trays shall be permitted to be used as equipment grounding
conductors, provided ____.
I. the cable tray sections and fittings are identified as an equipment grounding
conductor.
GUIDE FINAL EXAM #1 QUESTIONS
AND ANSWERS
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 service-lateral conductors? Consider all
termination lugs are rated for 75 deg. C.
A. 400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil - Correct Answers -D. 500 kcmil
pg. 142, 153, 161
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 - Correct Answers -B. 150 kVA
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 - Correct Answers -D. 100 lbs
pg. 57
,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% - Correct Answers -D. 125%
pg. 547
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 - Correct Answers -D. 26.6 amperes
pg. 309, 316
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 conductors within the wireway exceeds
at least ____ at any cross-section area of the wireway.
A. 20
B. 30
C. 35
D. 24 - Correct Answers -B. 30
pg. 229
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 interrupted?
A. 60 volts
B. 90 volts
C. 105 volts
D. 120 volts - Correct Answers -C. 105 volts
pg. 609
One- and two-family dwelling unit services are required to be provided with:
I. an emergency service disconnect
II. a surge-protective device
A. I only
B. II only
C. Both I and II
, D. Neither I nor II - Correct Answers -C. Both I and II
pg. 93, 95
When supplying a 36,000 VA, 240-volt, single-phase load in an area where the ambient
temperature reaches 119 deg. F, determine the MIN, size 75 deg. C rated copper
conductors required to supply the load.
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 4/0 AWG - Correct Answers -C. 3/0 AWG
pg. 161, 159
Color coding shall be permitted to identify intrinsically safe conductors where they are
colored ____ and where no other conductors of the same color are used.
A. light blue
B. orange
C. yellow
D. purple - Correct Answers -A. light blue
pg. 388
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 - Correct Answers -B. 70.2 amperes
pg. 309, 316
Where Type SRD multiconductor cable consist of size 8 AWG conductors and only 2
conductors in the cable are current-carrying, what is the ampacity of the conductors?
A. 20 amperes
B. 30 amperes
C. 40 amperes
D. 50 amperes - Correct Answers -C. 40 amperes
pg. 251
Aluminum or steel cable trays shall be permitted to be used as equipment grounding
conductors, provided ____.
I. the cable tray sections and fittings are identified as an equipment grounding
conductor.
