Exam (elaborations)
JOURNEYMAN ELECTRICIAN PRACTICE TEST
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JOURNEYMAN ELECTRICIAN PRACTICE TEST
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JOURNEYMAN ELECTRICIAN PRACTICE TESTConductors with _____ marked on the insulation are NOT approved for use in a wet
location. - Answers -THHN
conductors with THHN insulation are approved for use in dry and damp locations only
and conductors with THWN, THHW, and THW insulation are recognized for use in dry
and wet locations.
Given: A one-family dwelling unit with a demand load of 200 amperes is supplied with a
120/240 volt, single-phase, electrical system from the local utility company. What is the
MINIMUM size aluminum THW conductors required for use as service-entrance
conductors for this residence? - Answers -4/0 AWG
one-family dwelling 120/240 volt, single-phase, service-entrance conductors to be sized
at an ampacity of not less than 83% of the service rating. Therefore, 200 amperes x
83% = 166 amperes; size 4/0 AWG THW aluminum conductors with an allowable
ampacity of 180 amperes should be selected for this dwelling.
Where a 150 kVA, single-phase transformer having a secondary voltage of 120/240 is
installed at a multi-family dwelling, the full-load current rating, in amperes, of the
secondary is _____. - Answers -625 amperes
To find the full-load current rating of the single-phase transformer apply the single-
phase current formula as shown:I = (150 kVA x 1000) / 240 volts = 15,000/240 = 625
amperes
Which one of the following listed circuit breakers is NOT a standard ampere rating? -
Answers -75 amperes
the standard ampere ratings for fuses and circuit breakers. A circuit breaker with an
ampere rating of 75 amperes is not a standard ampere rating.
When armored cable, Type AC, is installed in an accessible attic and is run parallel to
the sides of rafters, studs, or floor joists, _____.
a. the cable shall be protected with running boards
b. the cable shall be protected by guard strips at least as high as the cable
c. either A or B
d. neither guard strips nor running boards shall be required - Answers -neither guard
strips nor running boards shall be required
where the armored cable is installed parallel to the sides of rafters, studs or floor joists,
neither guard strips nor running boards shall be required to protect the cable in
accessible attics.
, if the cables run across the top of the floor joists in an attic that is not accessible by
permanent studs or ladders, protection of the cable is required where within six (6) feet
of the nearest edge of the scuttle hole or attic entrance.
Generally, in a movie theater the manual switch for controlling the emergency lighting
systems is permitted to be located _____. - Answers -in an accessible location in the
lobby
apply buildings used as a theater or for a similar purpose. Section 520.8 mandates the
control of emergency systems in theaters to comply with the rules set forth in Article
700; Part V of Article 700 applies to the control of emergency lighting circuits. Section
700.21 does not permit a manual control switch for emergency lighting to be placed in a
motion picture projection booth or on a stage or platform; the switch shall be located in
the lobby or at a convenient accessible location.Emergency lighting systems are
designed and installed to maintain a specific degree of illumination for means of egress
of the building in the event of fire, or similar emergency, or if the normal power supply
fails.
Single-conductor cable such as _____ and single-conductor cable listed and identified
as solar photovoltaic (PV) wire are permitted for use in PV source circuits within the PV
array. - Answers -USE-2
690 covers the wiring methods specified for use on solar photovoltaic (PV) systems
arrays.
indicates open, single-conductors such as Type USE-2 and single-conductor cable
listed and identified as PV wire are permitted foruse in PV source circuits within the PV
array.
The MINIMUM length of free conductor to be left at each junction box for the purpose of
splicing conductors, or making connections to illuminares or devices shall be _____ . -
Answers -6 inches
free conductor is to be left at each junction box for splices or the connection of
luminaires or devices. The intent of this rule is to ensure enough conductor slack for the
terminal connections or splices to be made easily.
In general, overhead service-drop conductors shall NOT be smaller than _____. -
Answers -8 AWG copper
overhead service-drop conductors to be not smaller than 8 AWG copper or 6 AWG
aluminum or copper-clad aluminum. Do not get service-drop conductors, the overhead
conductors between the utility electric supply system and the service point, confused
with the service-entrance conductors, the conductors from the service point from the
utility company to the service disconnecting means.
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