Master Electrician Practice Test Guide
Take this free practice test of typical questions that may be encountered on most Master
Electrician’s licensing exams.
The subject matter covered in most electrical licensing examinations is: Grounding and bonding,
Overcurrent protection, Wiring methods and installation, Boxes and fittings, Services and
equipment, Motors, Special occupancies, Load calculations, Lighting, Appliances, Box and raceway
fill, Hazardous locations, Trade knowledge and Electrical theory.
When a journeyman electrician is ready to move up to the master level, they can take the master
electrician exam to prove they can perform this work at the master level. The exam covers electrical
regulations and may involve both written and hands-on examination.
Question 1:
The optional method of calculation for dwelling units is reserved for _______.
o multifamily dwelling units only
o dwelling units with over 3,000 sq. ft. of usable space
o dwelling units supplied by service conductors with an ampacity of 100 amperes or greater.
o dwelling units with a 208Y/120-volt, 3-phase, electrical system only
Explanation: According to Section 220.82(A) the optional method of calculation is permitted only if
the dwelling unit service-entrance conductors or feeder conductors have an ampacity of at least
100 amperes. This calculation method applies to a single dwelling unit, whether it is a separate
building or located in a multifamily dwelling. It applies to dwellings served by a 120/240-volt,
single phase system or a 208Y/120-volt, 3-phase system. Generally, the optional calculation method
provides an easier and less complex calculation method than the standard (general) method for
computing the total demand load for feeders and service-entrance conductors.
Question 2:
When calculating the service-entrance conductors of a farm where all the buildings, including the
dwelling, are supplied from a common service, the second largest individual load in the group shall
be calculated at _______.
o 60 percent
o 75 percent
o 80 percent
, o 90 percent
Explanation: Due to the fact all the equipment on a farm will not be used simultaneously for an
extended length of time, it is permitted to apply the demand factors shown in Table 220.103 when
calculating the farm service-entrance conductors. This table shows the second largest individual
load may be calculated at 75%.
Question 3:
The entire area of a service pit located in a commercial major repair garage that is not provided
with mechanical ventilation is classified as a _______ location.
o Class I, Division 1
o Class I, Division 2
o Class II, Division 1
o Class II, Division 2
Explanation: Section 511.3(C)(3)(b) indicates where mechanical ventilation is not provided in the
below floor level service pit of a major repair garage it shall be a Class I, Division 1 location. The
Class I, Division 1 location below grade extends from the floor of the pit to the service area floor
level.
Question 4:
The MAXIMUM distance conduit seals are permitted to be installed from an enclosure that houses
devices that produces arcs or high-temperatures in a Class I, Division 1 location is _______.
o 6 inches
o 24 inches
o 12 inches
o 18 inches
Explanation: The requirements for the location of conduit seals are to prevent an explosion from
traveling through the conduit to another enclosure and to minimize the passage of gases or vapors
from hazardous locations to nonhazardous locations. In Class 1, Division 1 locations, if the conduit
enters an enclosure that contains arcing or high-temperature equipment, as required by Section
501.15(A)(1), conduit seals shall be installed within 18 inches of the enclosure.
Question 5:
Take this free practice test of typical questions that may be encountered on most Master
Electrician’s licensing exams.
The subject matter covered in most electrical licensing examinations is: Grounding and bonding,
Overcurrent protection, Wiring methods and installation, Boxes and fittings, Services and
equipment, Motors, Special occupancies, Load calculations, Lighting, Appliances, Box and raceway
fill, Hazardous locations, Trade knowledge and Electrical theory.
When a journeyman electrician is ready to move up to the master level, they can take the master
electrician exam to prove they can perform this work at the master level. The exam covers electrical
regulations and may involve both written and hands-on examination.
Question 1:
The optional method of calculation for dwelling units is reserved for _______.
o multifamily dwelling units only
o dwelling units with over 3,000 sq. ft. of usable space
o dwelling units supplied by service conductors with an ampacity of 100 amperes or greater.
o dwelling units with a 208Y/120-volt, 3-phase, electrical system only
Explanation: According to Section 220.82(A) the optional method of calculation is permitted only if
the dwelling unit service-entrance conductors or feeder conductors have an ampacity of at least
100 amperes. This calculation method applies to a single dwelling unit, whether it is a separate
building or located in a multifamily dwelling. It applies to dwellings served by a 120/240-volt,
single phase system or a 208Y/120-volt, 3-phase system. Generally, the optional calculation method
provides an easier and less complex calculation method than the standard (general) method for
computing the total demand load for feeders and service-entrance conductors.
Question 2:
When calculating the service-entrance conductors of a farm where all the buildings, including the
dwelling, are supplied from a common service, the second largest individual load in the group shall
be calculated at _______.
o 60 percent
o 75 percent
o 80 percent
, o 90 percent
Explanation: Due to the fact all the equipment on a farm will not be used simultaneously for an
extended length of time, it is permitted to apply the demand factors shown in Table 220.103 when
calculating the farm service-entrance conductors. This table shows the second largest individual
load may be calculated at 75%.
Question 3:
The entire area of a service pit located in a commercial major repair garage that is not provided
with mechanical ventilation is classified as a _______ location.
o Class I, Division 1
o Class I, Division 2
o Class II, Division 1
o Class II, Division 2
Explanation: Section 511.3(C)(3)(b) indicates where mechanical ventilation is not provided in the
below floor level service pit of a major repair garage it shall be a Class I, Division 1 location. The
Class I, Division 1 location below grade extends from the floor of the pit to the service area floor
level.
Question 4:
The MAXIMUM distance conduit seals are permitted to be installed from an enclosure that houses
devices that produces arcs or high-temperatures in a Class I, Division 1 location is _______.
o 6 inches
o 24 inches
o 12 inches
o 18 inches
Explanation: The requirements for the location of conduit seals are to prevent an explosion from
traveling through the conduit to another enclosure and to minimize the passage of gases or vapors
from hazardous locations to nonhazardous locations. In Class 1, Division 1 locations, if the conduit
enters an enclosure that contains arcing or high-temperature equipment, as required by Section
501.15(A)(1), conduit seals shall be installed within 18 inches of the enclosure.
Question 5:
