MASTER ELECTRICIAN EXAM QUESTION AND
ANSWERS 2026 UPGRADE
1. A 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?: 180 amperes
2. Where a conductor is marked RHW-2 on the insulation what does the "-2"
represent?: The conductor has a maximum operating temperate of 90 degrees C.
3. For a grounded electrical system supplied by a feeder or branch circuit, the
equipment grounding conductor shall be sized in accordance with _____.: the
overcurrent protective device
4. For lighting systems operating at 30-volts or less, the output circuits of the
power supply are to
be rated for NOT more than _____.: 25 amperes
5. 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?: 50 kW
6. Where a service riser is installed in a wet location and contains THWN
insulated conductors, the wiring method used _____.: is permitted to be electrical metallic
tubing (EMT)
7. What is the MAXIMUM distance between supports for straight horizontal
runs of trade size 1½ in. threaded rigid metal conduit (RMC)?: 14 feet
8. Overcurrent protection of transformers, of 600 volts or less, is required to
be sized _____.: in accordance with Table 450.3(B)
9. 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 _____.: 12
inches
, 10. In movie theaters, all switches for controlling the emergency lighting systems shall be located
_____.: in the lobby
11. Where a 90 ampere, 240-volt, single-phase load is located 225 feet from a
panelboard and is supplied with size 3 AWG copper conductors, determine
the approximate voltage drop on the conductors. (K = 12.9): 10 volts
12. Wiring methods associated with solar photovoltaic (PV) systems shall not be
installed within _____ of the roof decking or sheathing except where directly
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Master Electrician
below the roof surface covered by PV modules and associated equipment.: 10
inches
13. All metallic switchgear rated for over 600 volts shall be provided with a
grounding busbar for the purpose of connecting the _____.: metallic shield of cables
14. Conductors tapped from a feeder and supplying the primary of a transformer need not have
overcurrent protection, where the length of the tap
conductors are not over 25 feet and have an ampacity of at LEAST _____ of the
rating of the overcurrent device protecting the feeder conductors.: one-third
15. Electrical equipment such as switchboards, panelboards, industrial control
panels, and motor control centers, located in commercial and industrial occupancies are required to be
field marked to warn _____ of potential electrical
arc flash hazards.: qualified persons
16. When connecting utilization equipment to a 20-ampere rated branch-circuit
that also serves luminaires (lighting fixtures), the utilization equipment shall
have an ampere rating of NOT more than _____.: 10 amperes
17. Where a hotel has a stationary electric sign installed inside a decorative
fountain, the sign shall be at LEAST _____ inside the fountain, when measuring
from the outside edges of the fountain.: 5 feet
18. In an aircraft hanger, the area that extends upward from the floor level _____
above the upper surface of aircraft wings, power plants and fuel tanks shall
ANSWERS 2026 UPGRADE
1. A 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?: 180 amperes
2. Where a conductor is marked RHW-2 on the insulation what does the "-2"
represent?: The conductor has a maximum operating temperate of 90 degrees C.
3. For a grounded electrical system supplied by a feeder or branch circuit, the
equipment grounding conductor shall be sized in accordance with _____.: the
overcurrent protective device
4. For lighting systems operating at 30-volts or less, the output circuits of the
power supply are to
be rated for NOT more than _____.: 25 amperes
5. 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?: 50 kW
6. Where a service riser is installed in a wet location and contains THWN
insulated conductors, the wiring method used _____.: is permitted to be electrical metallic
tubing (EMT)
7. What is the MAXIMUM distance between supports for straight horizontal
runs of trade size 1½ in. threaded rigid metal conduit (RMC)?: 14 feet
8. Overcurrent protection of transformers, of 600 volts or less, is required to
be sized _____.: in accordance with Table 450.3(B)
9. 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 _____.: 12
inches
, 10. In movie theaters, all switches for controlling the emergency lighting systems shall be located
_____.: in the lobby
11. Where a 90 ampere, 240-volt, single-phase load is located 225 feet from a
panelboard and is supplied with size 3 AWG copper conductors, determine
the approximate voltage drop on the conductors. (K = 12.9): 10 volts
12. Wiring methods associated with solar photovoltaic (PV) systems shall not be
installed within _____ of the roof decking or sheathing except where directly
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Master Electrician
below the roof surface covered by PV modules and associated equipment.: 10
inches
13. All metallic switchgear rated for over 600 volts shall be provided with a
grounding busbar for the purpose of connecting the _____.: metallic shield of cables
14. Conductors tapped from a feeder and supplying the primary of a transformer need not have
overcurrent protection, where the length of the tap
conductors are not over 25 feet and have an ampacity of at LEAST _____ of the
rating of the overcurrent device protecting the feeder conductors.: one-third
15. Electrical equipment such as switchboards, panelboards, industrial control
panels, and motor control centers, located in commercial and industrial occupancies are required to be
field marked to warn _____ of potential electrical
arc flash hazards.: qualified persons
16. When connecting utilization equipment to a 20-ampere rated branch-circuit
that also serves luminaires (lighting fixtures), the utilization equipment shall
have an ampere rating of NOT more than _____.: 10 amperes
17. Where a hotel has a stationary electric sign installed inside a decorative
fountain, the sign shall be at LEAST _____ inside the fountain, when measuring
from the outside edges of the fountain.: 5 feet
18. In an aircraft hanger, the area that extends upward from the floor level _____
above the upper surface of aircraft wings, power plants and fuel tanks shall
