JOURNEYMAN (OIL BURNER) ELECTRICIAN EXAM QUESTIONS AND
ANSWERS #21
For other than one-and two-family dwellings, when building a new electrical service, at
least one (1) 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be
located within at LEAST _____ of the electrical service equipment? - correct answer 50
feet
The ampacity of a conductor is defined by the NEC to be the maximum current, in
amperes, a conductor can carry continuously under the conditions of use without
exceeding ______? - correct answer it's temperature rating
Disconnect switch enclosure installed in a Class II, Division 2 location shall be listed as
_____? - correct answer dusttight
The interior of enclosures or raceways installed underground shall be considered as a
_____ location? - correct answer dry
Determine the MAXIMUM allowable current-carrying capacity of four (4) size 1/0 AWG
THW copper current-carrying conductors installed in a common raceway with an
ambient temperature of 86 degrees F? - correct answer 120 amperes
The NEC defines a continuous load to be a load where the maximum current on the
circuit is expected to continue for at LEAST____ hours or more? - correct answer three
The service disconnecting means for each electrical service shall consist of NOT more
than _____ switches or circuit breakers, mounted in a single enclosure or in a group of
separate enclosures. - correct answer six
Given: You have determined a conductor has a computed allowable ampacity of 75
amperes. What is the MAXIMUM standard ampere rating of the overcurrent protection
device the NEC® permits to protect this circuit where this is not a motor circuit or part of
a multioutlet branch circuit supplying more than one receptacle? - correct answer 80
amperes
A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, ac motor has a full-load
running current rating of _____? - correct answer 143 amperes
What is the MAXIMUM distance that a disconnect switch is permitted to be located from
the operator's station for a portable carnival ride? - correct answer 6 feet
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose
eight (8) size 6 AWG copper conductors with THHW insulation, when installed in a 50
foot conduit run? - correct answer 1 1/4 in.
, Where exceptions are not applicable, when a feeder supplies a continuous load of 240
amperes, the overcurrent protection device protecting this circuit shall have a rating of
at LEAST _____? - correct answer 300 amperes
Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _____ of
each box or other conduit termination? - correct answer 12 inches
Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a
straight pull of the conductors is to be made, the length of the box shall NOT be less
than ____times the trade diameter of the largest conduit entering the box. - correct
answer eight
Conduit nipples not over 24 inches in length may be filled to a MAXIMUM of _____ of
their cross-sectional area. - correct answer 60 percent
Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be
installed in a trade size 3/8 in. Flexible metal conduit (FMC) that contains a bare size 14
AWG grounding conductor, when the FMC has external fittings. - correct answer four
Which one of the following listed conduits does the NEC® permit to enclose conductors
supplying wet-niche underwater pool luminaires? - correct answer Schedule 40 rigid
polyvinyl chloride conduit (PVC)
Underground wiring is not permitted under a permanently installed swimming pool or
within _____ of the pool, unless the wiring is supplying the associated pool equipment. -
correct answer 5 feet
Which of the following listed types of batteries is NOT permitted for use as a source of
power for emergency systems? - correct answer automotive
In regard to electric space heating equipment, heating cables shall be furnished
complete with factory-assembled nonheating leads at LEAST _____ in length. - correct
answer 7 feet
In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____
general purpose receptacles installed in the room is/are required to be readily
accessible. - correct answer two
A listed _____ shall be installed in or on all emergency systems switchboards and
panelboards? - correct answer surge protective device (SPD)
Where a size 4 AWG or larger conductor enters a panelboard, which of the following
must be provided? - correct answer An insulated bushing.
Class _____ locations are those that are hazardous because of the presence of easily
ignitible fibers or where materials producing combustible flyings are handled, but in
ANSWERS #21
For other than one-and two-family dwellings, when building a new electrical service, at
least one (1) 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be
located within at LEAST _____ of the electrical service equipment? - correct answer 50
feet
The ampacity of a conductor is defined by the NEC to be the maximum current, in
amperes, a conductor can carry continuously under the conditions of use without
exceeding ______? - correct answer it's temperature rating
Disconnect switch enclosure installed in a Class II, Division 2 location shall be listed as
_____? - correct answer dusttight
The interior of enclosures or raceways installed underground shall be considered as a
_____ location? - correct answer dry
Determine the MAXIMUM allowable current-carrying capacity of four (4) size 1/0 AWG
THW copper current-carrying conductors installed in a common raceway with an
ambient temperature of 86 degrees F? - correct answer 120 amperes
The NEC defines a continuous load to be a load where the maximum current on the
circuit is expected to continue for at LEAST____ hours or more? - correct answer three
The service disconnecting means for each electrical service shall consist of NOT more
than _____ switches or circuit breakers, mounted in a single enclosure or in a group of
separate enclosures. - correct answer six
Given: You have determined a conductor has a computed allowable ampacity of 75
amperes. What is the MAXIMUM standard ampere rating of the overcurrent protection
device the NEC® permits to protect this circuit where this is not a motor circuit or part of
a multioutlet branch circuit supplying more than one receptacle? - correct answer 80
amperes
A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, ac motor has a full-load
running current rating of _____? - correct answer 143 amperes
What is the MAXIMUM distance that a disconnect switch is permitted to be located from
the operator's station for a portable carnival ride? - correct answer 6 feet
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose
eight (8) size 6 AWG copper conductors with THHW insulation, when installed in a 50
foot conduit run? - correct answer 1 1/4 in.
, Where exceptions are not applicable, when a feeder supplies a continuous load of 240
amperes, the overcurrent protection device protecting this circuit shall have a rating of
at LEAST _____? - correct answer 300 amperes
Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _____ of
each box or other conduit termination? - correct answer 12 inches
Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a
straight pull of the conductors is to be made, the length of the box shall NOT be less
than ____times the trade diameter of the largest conduit entering the box. - correct
answer eight
Conduit nipples not over 24 inches in length may be filled to a MAXIMUM of _____ of
their cross-sectional area. - correct answer 60 percent
Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be
installed in a trade size 3/8 in. Flexible metal conduit (FMC) that contains a bare size 14
AWG grounding conductor, when the FMC has external fittings. - correct answer four
Which one of the following listed conduits does the NEC® permit to enclose conductors
supplying wet-niche underwater pool luminaires? - correct answer Schedule 40 rigid
polyvinyl chloride conduit (PVC)
Underground wiring is not permitted under a permanently installed swimming pool or
within _____ of the pool, unless the wiring is supplying the associated pool equipment. -
correct answer 5 feet
Which of the following listed types of batteries is NOT permitted for use as a source of
power for emergency systems? - correct answer automotive
In regard to electric space heating equipment, heating cables shall be furnished
complete with factory-assembled nonheating leads at LEAST _____ in length. - correct
answer 7 feet
In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____
general purpose receptacles installed in the room is/are required to be readily
accessible. - correct answer two
A listed _____ shall be installed in or on all emergency systems switchboards and
panelboards? - correct answer surge protective device (SPD)
Where a size 4 AWG or larger conductor enters a panelboard, which of the following
must be provided? - correct answer An insulated bushing.
Class _____ locations are those that are hazardous because of the presence of easily
ignitible fibers or where materials producing combustible flyings are handled, but in
