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Master Electrician's Exam Prep Guide: Exams #10-12 with 75 Complete Solutions, Exams of Electrical and Electronics Engineering

A comprehensive guide for preparing for master electrician's exams #10-12. It includes 75 complete solutions to various questions covering essential electrical concepts and regulations. Designed to help individuals studying for the master electrician's exam by providing practice questions and answers.

Typology: Exams

2024/2025

Available from 03/06/2025

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Master Electrician's Exam Prep Guide
Exams #10-12 with 75 complete
solutions 100% rated
Master Electrician's Exam Prep Guide
Exams #10-12 with 75 complete
solutions 100% rated
At carnivals and fairs, service equipment shall not be installed in a location that is accessible to
unqualified persons, UNLESS the equipment ____.
A. has a voltage to ground of not more than 125 volts
B. is provided with GFCI protection
C. is lockable
D. is installed at a height of more than 6 feet - ANSWER C. is lockable
pg. 463
Where the NEC specifies that one equipment shall be "within sight from" or "within sight of" another
equipment, the specified equipment is to be visible and NOT more than ____ from the other.
A. 50 feet
B. 100 feet
C. 125 feet
D. 200 feet - ANSWER A. 50 feet
pg. 37
As a general rule, where a cable is installed parallel to framing members, the cable shall be installed so
that the nearest edge of the cable is NOT less than ____ from the nearest edge of the framing member.
A. 3/4 in.
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Download Master Electrician's Exam Prep Guide: Exams #10-12 with 75 Complete Solutions and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

Exams #10-12 with 75 complete

solutions 100% rated

Master Electrician's Exam Prep Guide

Exams #10- 12 with 75 complete

solutions 100% rated

At carnivals and fairs, service equipment shall not be installed in a location that is accessible to unqualified persons, UNLESS the equipment ____.

A. has a voltage to ground of not more than 125 volts

B. is provided with GFCI protection

C. is lockable

D. is installed at a height of more than 6 feet - ANSWER C. is lockable

pg. 463

Where the NEC specifies that one equipment shall be "within sight from" or "within sight of" another equipment, the specified equipment is to be visible and NOT more than ____ from the other.

A. 50 feet

B. 100 feet

C. 125 feet

D. 200 feet - ANSWER A. 50 feet

pg. 37

As a general rule, where a cable is installed parallel to framing members, the cable shall be installed so that the nearest edge of the cable is NOT less than ____ from the nearest edge of the framing member.

A. 3/4 in.

Exams #10-12 with 75 complete

solutions 100% rated

B. 1 in.

C. 1 1/4 in.

D. 1 1/2 in. - ANSWER C. 1 1/4 in.

pg. 141

Generally, how many grounded conductors are permitted to be terminated under an individual terminal within a switchboard or panelboard where the equipment operates at less than 1,000 volts?

A. four

B. three

C. two

D. one - ANSWER D. one

pg. 274

The service equipment provided for a mobile home shall be located in sight from and NOT more than ____ from the exterior wall of the mobile home it serves.

A. 50 feet

B. 30 feet

C. 75 feet

D. 100 feet - ANSWER B. 30 feet

pg. 479

What is the MAX. number of size 1/0 AWG THH/THWN copper current-carrying conductors allowed by the NEC at any cross-sectional area of a 4in. x 4 in. metallic wireway?

A. 17

Exams #10-12 with 75 complete

solutions 100% rated

1,150 VA garbage disposer

700 VA attic fan

1,920 VA garage door opener

The demand load, in VA, on the ungrounded (line) service entrance conductors for the listed appliances is ____ when applying the general method of calculations for dwelling units.

A. 7,728 VA

B. 6,728 VA

C. 6,276 VA

D. 8,970 VA - ANSWER B. 6,728 VA

pg. 77

Nonmetallic cable trays shall be made of ____ material.

A. fire-resistant

B. waterproof

C. fire-proof

D. flame-retardant - ANSWER D. flame-retardant

pg. 243

Switches are to be located a horizontal distance of LEAST ____ from the inside walls of an indoor placed spa or hot tub.

A. 4 feet

B. 5 feet

C. 8 feet

D. 10 feet - ANSWER B. 5 feet

Exams #10-12 with 75 complete

solutions 100% rated

pg. 575

Direct buried cables installed under an open field vacant property must have a MIN. cover depth of ____ when the applied voltage is not more than 600 volts.

A. 24 inches

B. 18 inches

C. 12 inches

D. 30 inches - ANSWER A. 24 inches

pg. 143

Shore power for boats docked in marinas and boatyards shall be provided by single receptacles that are of the locking- and grounding-type, mounted at least 12 inches above the deck surface, and rated NOT less than ____.

A. 50 amperes

B. 40 amperes

C. 30 amperes

D. 20 amperes - ANSWER C. 30 amperes

pg. 502

For electrical systems over 1000 volts, where pulls of conductors in junction boxes are being made, the length of the box shall NOT be less than ____ the outside diameter of the largest shielded or lead- covered conductor or cable entering the box.

A. 8 times

B. 12 times

C. 32 times

Exams #10-12 with 75 complete

solutions 100% rated

C. 4 feet

D. 5 feet - ANSWER D. 5 feet

pg. 225

At LEAST ____ of free conductor, measured from the point in the box where it emerges from its raceway, shall be left at each junction box or device box for splices or connections to devices.

A. 4 inches

B. 6 inches

C. 8 inches

D. 12 inches - ANSWER B. 6 inches

pg. 146

Where fixed wiring above bulk storage tanks is installed in PVC conduit, the PVC shall be ____.

A. Schedule 20

B. Schedule 40

C. Schedule 80

D. Schedule 100 - ANSWER C. Schedule 80

pg. 420

Electrical installations which are controlled by lock(s) or other approved means, shall be considered to be accessible to ____.

A. personnel with a key

B. qualified persons only

C. personnel with authority

Exams #10-12 with 75 complete

solutions 100% rated

D. building inspectors and first responders - ANSWER B. qualified persons only

pg. 52

The size of an equipment grounding conductor of the wire type is based on the ____.

A. line voltage

B. conductor resistance

C. line inductance

D. the rating of the branch-circuit, short-circuit, and ground-fault protective device - ANSWER D. the rating of the branch-circuit, short-circuit, and ground-fault protective device

pg. 132, 133

The NEC mandates expansion fittings for rigid PVC conduit shall be provided to compensate for thermal expansion. In an environment where the normal annual change in temperature is 100 deg. F, and the length of the PVC is 100 feet, how much allowance for thermal expansion must be considered?

A. 4.06 inches

B. 6.08 inches

C. 3.04 inches

D. 8.11 inches - ANSWER A. 4.06 inches

pg. 212

Where an enclosure housing a motor controller is located outdoors and subjected to exposure to heavy rain, sleet and snow, the enclosure must have a MIN. listing as a ____ enclosure.

A. Type 1

B. Type 3

Exams #10-12 with 75 complete

solutions 100% rated

B. 4 feet

C. 5 feet

D. 6 feet - ANSWER A. 3 feet

pg. 211

A hazardous location where easily ignitable fibers or materials producing combustible flyings are handled, manufactured, or used, but where they are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures is recognized as a ____ location in the NEC.

A. Class I

B. Class II

C. Class III

D. Class IV - ANSWER C. Class III

pg. 363

A copper-clad steel rod type grounding electrode shall be at LEAST ____ in diameter.

A. 3/8 in.

B. 1/2 in.

C. 5/8 in.

D. 3/4 in. - ANSWER C. 5/8 in.

pg. 120

Given: A single phase, 120/240-volt service of a single-family dwelling has a chain-link metal fence opposite exposed live parts of the service equipment. The required depth of the working space in front of the service equipment must be at LEAST ____.

Exams #10-12 with 75 complete

solutions 100% rated

A. 2 ft. 6 in.

B. 3 ft.

C. 3 ft. 6 in.

D. 4 ft. - ANSWER B. 3 ft.

pg. 50

Tap conductors for a recessed luminaire shall be in a suitable raceway or Type AC or MC cable having a length NOT to exceed ____.

A. 4 ft.

B. 6 ft.

C. 5 ft.

D. 8 ft. - ANSWER B. 6 ft.

pg. 283

Where exposed Type NM cable passes through a floor, the cable shall be protected from physical damage by an approved means extending at LEAST ____ above the floor.

A. 10 inches

B. 8 inches

C. 12 inches

D. 6 inches - ANSWER D. 6 inches

pg. 199

When used as a direct buried cable, which of the following wiring methods is permitted for use to supply a water well pump located 50 feet from a dwelling?

Exams #10-12 with 75 complete

solutions 100% rated

A. 10 feet

B. 6 feet

C. 7 feet

D. 8 feet - ANSWER C. 7 feet

pg. 293

Where the heating, air conditioning or refrigeration equipment is installed on the roof of a commercial, industrial, or a multifamily apartment building, a single-phase, 125-volt, 15- or 20-ampere rated receptacle outlet ____.

A. is required to be located within 100 ft. from the equipment

B. may be connected to the line side of the equipment disconnecting means, provided the receptacle is equipped with GFCI protection

C. shall be located on the same level and within 25 ft. of the equipment

D. is permitted to be connected to the load side of the equipment disconnecting means, if within 10 ft. of the equipment and GFCI protected - ANSWER C. shall be located on the same level and within 25 ft. of the equipment

pg. 70

Given: An existing 150 kVA transformer with a 208Y/120-volt, 3 phase, secondary has a full-load current of 220 amperes per phase. What approximate additional single phase load, per phase, may be added to the secondary side of the transformer?

A. 180 amperes

B. 196 amperes

C. 416 amperes

D. 334 amperes - ANSWER B. 196 amperes

Exams #10-12 with 75 complete

solutions 100% rated

The conductors in multiconductor portable cables, of over 600 volts nominal, used to connect mobile equipment and machinery, shall be at LEAST size ____ copper or larger and employ flexible stranding.

A. 14 AWG

B. 12 AWG

C. 10 AWG

D. 8 AWG - ANSWER B. 12 AWG

pg. 260

In metal raceways or enclosures, all conductors of feeder using a common neutral shall be enclosed within the same raceway or enclosure, with a MAX. of ____ sets of 3-wire feeders permitted to utilize a common neutral.

A. two

B. three

C. four

D. five - ANSWER B. three

pg. 72

When installing surface-type metal panelboards, cabinets, disconnects or meter socket enclosures in damp or wet locations they shall be mounted so there is at LEAST ____ airspace between the enclosure and the wall or other supporting surface.

A. 1/2 in.

B. 3/8 in.

C. 3/4 in.

D. 1/4 in. - ANSWER D. 1/4 in.

pg. 179

Exams #10-12 with 75 complete

solutions 100% rated

D. 3/0 AWG - ANSWER B. 1/0 AWG

pg. 161

According to the NEC, the ampacity of a conductor is the current, in amperes, that the conductor can carry continuously under the conditions of use without exceeding its ____.

A. voltage rating

B. power rating

C. temperature rating

D. insulation rating - ANSWER C. temperature rating

pg. 32

Where a building or structure is supplied by more than one service from the local utility company:

A. a fire pump shall be installed

B. a permanent plaque shall be installed at each service disconnect location denoting all other services

C. an optional standby system shall be installed

D. all of the above shall be installed - ANSWER B. a permanent plaque shall be installed at each service disconnect location denoting all other services

pg. 89

In Class I, Division 1 locations, all threaded conduit and fittings referred as National Standard Pipe Taper (NPT) thread that are entries into explosion proof equipment shall be made up with at LEAST ____ fully engaged threads.

A. five

B. three

Exams #10-12 with 75 complete

solutions 100% rated

C. four

D. six - ANSWER A. five

pg. 367

Except as otherwise permitted in the NEC, where the service entrance conductors for a commercial building or an industrial facility are size 250 kcmil aluminum with XHHW insulation, what MIN. size copper grounding electrode conductor is required?

A. 6 AWG

B. 4 AWG

C. 2 AWG

D. 1 AWG - ANSWER C. 2 AWG

pg. 133

Where a wall-mounted central vacuum system is cord-and-plug connected to a single-phase , 125-volt, 20-ampere receptacle located in an attached garage of a residence, the receptacle shall be provided with ____ protection.

A. only AFCI

B. only GFCI

C. both AFCI and GFCI

D. only LCDI - ANSWER B. only GFCI

pg. 62

For track lighting in other than dwelling units, or guest rooms of hotels and motels, a load of ____ shall be calculated for every 2 ft. of lighting track or fraction thereof.

A. 200 VA

Exams #10-12 with 75 complete

solutions 100% rated

C. over steps of a stairway

D. under a mezzanine - ANSWER C. over steps of a stairway

pg. 103

For the purpose of determining conductor fill in a device box, a three-way switch is counted as equal to ____ conductor(s), based on the largest conductor connected to the switch.

A. one

B. two

C. three

D. four - ANSWER B. two

pg. 183

A transformer vault is required to be provided with a door sill or curb with a height of NOT less than ____.

A. 6 in.

B. 8 in.

C. 2 in.

D. 4 in. - ANSWER D. 4 in.

pg. 348

Single phase, 125-volt, 15- and 20-ampere receptacle outlets installed in floors of dwelling units shall not be counted as part of the required number of receptacle outlets, if they are located more than ____ from the wall.

A. 18 in.

Exams #10-12 with 75 complete

solutions 100% rated

B. 12 in.

C. 30 in.

D. 24 in. - ANSWER A. 18 in.

pg. 68

When exceptions are not applicable, where a feeder serves a continuous load of 240 amperes the overcurrent protection device protecting this circuit shall have a MIN. ampere rating of ____.

A. 250 amperes

B. 275 amperes

C. 300 amperes

D. 325 amperes - ANSWER C. 300 amperes

pg. 71

Grounding conductors and bonding jumpers shall NOT be connected by ____.

A. exothermic welding

B. pressure connectors

C. machine screw-type fasteners

D. sheet metal screws - ANSWER D. sheet metal screws

pg. 113

Determine the initial standard size time-delay fuses permitted for branch-circuit, short-circuit and ground-fault protection for a 50 hp, 3 phase, 460-volts, induction type motor with a FLA rating of 61 amperes marked on the nameplate. Hint: use only one exception.

A. 100 amperes