Electrical Journeyman Study Set 1
Study online at https://quizlet.com/_8iu4io
1. Conductors with _______ marked on the insulation are NOT approved for
use in a wet location.: T H H N
2. Given: A one-family dwelling unit with a demand load of 200 amperes is sup-
plied 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?: 4/0 AWG
Section 310.15(B)(7)(1) permits 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
Table 310.15(B)(16) indicates size 4/0 AWG THW aluminum conductors with an
allowable ampacity of 180 amperes should be selected for this dwelling.
3. 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 _____: 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
4. Which one of the following listed circuit breakers is NOT a standard ampere
rating?: Table 240.6(A) illustrates 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.
5. The MINIMUM length of free conductor to be left at each junction box for
the purpose of splicing conductors, or making connections to luminaires or
devices shall be _____ .: As per Section 300.14 at least 6 in. of 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.
6. In general, overhead service-drop conductors shall NOT be smaller than
_____.: Section 230.23(B) requires overhead service-drop conductors to be not
smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Do not
1/6
, Electrical Journeyman Study Set 1
Study online at https://quizlet.com/_8iu4io
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.
7. When a galvanized eye-bolt is to be used as the point of attachment for an
electrical service, the NEC requires the eye-bolt to be installed NOT less than
_____ above finished grade.: The intent of Section 230.26 is to provide adequate
vertical clearance of the conductors and prevent physical damage to the conductors
and prevent persons from making 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.
8. Why is electrical continuity required for metallic conduit?: Electrical con-
tinuity is required for metallic conduit to establish an effective ground-fault path
and facilitate the operation of the overcurrent protective device. Reference Section
250.4(A)(4) and (5).
9. In dwelling units, receptacle outlets installed for countertop surfaces, must
be located above, but NOT more than _____ above the countertop or work
surface.: In compliance with Section 210.52(C)(5), receptacle outlets installed for
countertop or work surfaces in dwelling units may be located on or above, but not
more than 20 in. above the countertop or work surface. The intent of this rule is
to eliminate the use of unsightly extension cords (which reduces the amount of
usable countertop space) on the countertop or work surface to supply cord-and-plug
connected appliances. Also, receptacles located more than 20 inches above coun-
tertops or work surfaces may interfere with the cabinetry to be installed.
10. When conductors are installed in a conduit or tubing nipple of _____
or less in length, the ampacity adjustment factors for more than three (3)
current-carrying conductors in the raceway, are not required to be applied.-
: Section 310.15(B)(3)(a)(2) clarifies that adjustment factors for more than three
(3) current-carrying conductors in raceways shall not apply where the raceway is
not more than 24 inches in length. Where more than 3 current-carrying conductors
are installed in short lengths of conduit or tubing, the heating effect caused from
the additional conductors is insignificant therefore, the allowable ampacity of the
conductors is not greatly reduced.
11. In compliance with the NEC, the total marked rating of a 120-volt,
cord-and-plug-connected room air conditioner shall not exceed _____ of the
rating of a branch circuit when lighting units, general-use receptacles, or other
appliances are supplied from the branch circuit.: Part VII of Article 440 outlines
the special provisions for room air conditioners which are (1) rated not over 250-volts
ac, single-phase and (2) which are cord-and-attachment plug connected. In order
2/6
Study online at https://quizlet.com/_8iu4io
1. Conductors with _______ marked on the insulation are NOT approved for
use in a wet location.: T H H N
2. Given: A one-family dwelling unit with a demand load of 200 amperes is sup-
plied 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?: 4/0 AWG
Section 310.15(B)(7)(1) permits 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
Table 310.15(B)(16) indicates size 4/0 AWG THW aluminum conductors with an
allowable ampacity of 180 amperes should be selected for this dwelling.
3. 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 _____: 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
4. Which one of the following listed circuit breakers is NOT a standard ampere
rating?: Table 240.6(A) illustrates 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.
5. The MINIMUM length of free conductor to be left at each junction box for
the purpose of splicing conductors, or making connections to luminaires or
devices shall be _____ .: As per Section 300.14 at least 6 in. of 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.
6. In general, overhead service-drop conductors shall NOT be smaller than
_____.: Section 230.23(B) requires overhead service-drop conductors to be not
smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Do not
1/6
, Electrical Journeyman Study Set 1
Study online at https://quizlet.com/_8iu4io
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.
7. When a galvanized eye-bolt is to be used as the point of attachment for an
electrical service, the NEC requires the eye-bolt to be installed NOT less than
_____ above finished grade.: The intent of Section 230.26 is to provide adequate
vertical clearance of the conductors and prevent physical damage to the conductors
and prevent persons from making 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.
8. Why is electrical continuity required for metallic conduit?: Electrical con-
tinuity is required for metallic conduit to establish an effective ground-fault path
and facilitate the operation of the overcurrent protective device. Reference Section
250.4(A)(4) and (5).
9. In dwelling units, receptacle outlets installed for countertop surfaces, must
be located above, but NOT more than _____ above the countertop or work
surface.: In compliance with Section 210.52(C)(5), receptacle outlets installed for
countertop or work surfaces in dwelling units may be located on or above, but not
more than 20 in. above the countertop or work surface. The intent of this rule is
to eliminate the use of unsightly extension cords (which reduces the amount of
usable countertop space) on the countertop or work surface to supply cord-and-plug
connected appliances. Also, receptacles located more than 20 inches above coun-
tertops or work surfaces may interfere with the cabinetry to be installed.
10. When conductors are installed in a conduit or tubing nipple of _____
or less in length, the ampacity adjustment factors for more than three (3)
current-carrying conductors in the raceway, are not required to be applied.-
: Section 310.15(B)(3)(a)(2) clarifies that adjustment factors for more than three
(3) current-carrying conductors in raceways shall not apply where the raceway is
not more than 24 inches in length. Where more than 3 current-carrying conductors
are installed in short lengths of conduit or tubing, the heating effect caused from
the additional conductors is insignificant therefore, the allowable ampacity of the
conductors is not greatly reduced.
11. In compliance with the NEC, the total marked rating of a 120-volt,
cord-and-plug-connected room air conditioner shall not exceed _____ of the
rating of a branch circuit when lighting units, general-use receptacles, or other
appliances are supplied from the branch circuit.: Part VII of Article 440 outlines
the special provisions for room air conditioners which are (1) rated not over 250-volts
ac, single-phase and (2) which are cord-and-attachment plug connected. In order
2/6
