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Journeyman Electrician Practice Test Questions and Answers (Graded A)

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Journeyman Electrician Practice

Test Questions and Answers

(Graded A)

Conductors with _____ marked on the insulation are NOT approved for use in

a wet location. - ANSWER-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? -

ANSWER-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 _____. - ANSWER-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? - ANSWER-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.

, 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 _____ . - ANSWER-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

_____. - ANSWER-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.

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. - ANSWER-10 ft.

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