Journeyman Electrician Practice Test questions
and Answers | LATEST UPDATE
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Terms in this set (50)
Conductors with _____ marked on the THHN
insulation are NOT approved for use
in a wet location. 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 4/0 AWG
with a demand load of 200 amperes
is supplied with a 120/240 volt, one-family dwelling 120/240 volt, single-phase,
single-phase, electrical system from service-entrance conductors to be sized at an
the local utility company. What is the ampacity of not less than 83% of the service rating.
MINIMUM size aluminum THW Therefore, 200 amperes x 83% = 166 amperes; size
conductors required for use as 4/0 AWG THW aluminum conductors with an
service-entrance conductors for this allowable ampacity of 180 amperes should be
residence? selected for this dwelling.
Where a 150 kVA, single-phase 625 amperes
transformer having a secondary
voltage of 120/240 is installed at a To find the full-load current rating of the single-
multi-family dwelling, the full-load phase transformer apply the single-phase current
current rating, in amperes, of the formula as shown:I = (150 kVA x 1000) / 240 volts =
secondary is _____. 15,000/240 = 625 amperes
, Which one of the following listed 75 amperes
circuit breakers is NOT a standard
ampere rating? 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.
The MINIMUM length of free 6 inches
conductor to be left at each junction
box for the purpose of splicing free conductor is to be left at each junction box for
conductors, or making connections splices or the connection of luminaires or devices.
to illuminares or devices shall be _____ 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 8 AWG copper
conductors shall NOT be smaller
than _____. 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.
When a galvanized eye-bolt is to be 10 ft.
used as the point of attachment for
an electrical service, the NEC provide adequate vertical clearance of the
requires the eye-bolt to be installed conductors and prevent physical damage to the
NOT less than _____ above finished conductors and prevent persons from making
grade. accidental contact with the conductors which may
create a shock hazard or electrocution. In no case
shall the point of attachment of the service-drop
conductors to be less than 10 ft. above finished
grade.
and Answers | LATEST UPDATE
Save
Terms in this set (50)
Conductors with _____ marked on the THHN
insulation are NOT approved for use
in a wet location. 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 4/0 AWG
with a demand load of 200 amperes
is supplied with a 120/240 volt, one-family dwelling 120/240 volt, single-phase,
single-phase, electrical system from service-entrance conductors to be sized at an
the local utility company. What is the ampacity of not less than 83% of the service rating.
MINIMUM size aluminum THW Therefore, 200 amperes x 83% = 166 amperes; size
conductors required for use as 4/0 AWG THW aluminum conductors with an
service-entrance conductors for this allowable ampacity of 180 amperes should be
residence? selected for this dwelling.
Where a 150 kVA, single-phase 625 amperes
transformer having a secondary
voltage of 120/240 is installed at a To find the full-load current rating of the single-
multi-family dwelling, the full-load phase transformer apply the single-phase current
current rating, in amperes, of the formula as shown:I = (150 kVA x 1000) / 240 volts =
secondary is _____. 15,000/240 = 625 amperes
, Which one of the following listed 75 amperes
circuit breakers is NOT a standard
ampere rating? 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.
The MINIMUM length of free 6 inches
conductor to be left at each junction
box for the purpose of splicing free conductor is to be left at each junction box for
conductors, or making connections splices or the connection of luminaires or devices.
to illuminares or devices shall be _____ 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 8 AWG copper
conductors shall NOT be smaller
than _____. 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.
When a galvanized eye-bolt is to be 10 ft.
used as the point of attachment for
an electrical service, the NEC provide adequate vertical clearance of the
requires the eye-bolt to be installed conductors and prevent physical damage to the
NOT less than _____ above finished conductors and prevent persons from making
grade. accidental contact with the conductors which may
create a shock hazard or electrocution. In no case
shall the point of attachment of the service-drop
conductors to be less than 10 ft. above finished
grade.
