NEC Commercial Electrical Exam 2011 Exam 1 Questions 101-150

All 125-volts receptacles located within _____ feet from the inside walls of a pool or fountain shall be protected by a grounding - fault circuit interrupter.

20 feet section 680.22 (4)

The sum of the cross-sectional areas of all the contained conductors at any cross-section of an auxiliary gutter shall be a maximum of ______ percent of the interior cross-sectional area of the gutter

20 percent Section 336.22

Electrodes of pipe or conduit shall not be smaller than disignator ______ and, where of iron or steel, shall have the outer surface galvanized or otherwise metal-coated for corrosion protection.

21 - trade size 3/4

For industrial installations only, where the length of the secondary conductors does not exceed______ feet and comlies with all of the following: the ampacity of the secondary conductors is not less than the secondary current rating of the transformer.

25 feet Section 240.21 (3)

A continuous load is a load where the maximum current is expected to continue for _____ hours or more.

3 Hours Section 100

The minimum depth of working space at electrical equipment over 600 volts is _____ feet

3 feet Section Table 110.34 (A)

The maximum rating of a branch circuit for a flat cable assembly installed in a surface metal raceway is _____ ampere.

30 ampere Section 322.2 II (2)

For feeders which supply a load consisting of more than two-wire branch circuits supplied by a three-wire feeder, the ampacity of the feeder conductors shall be a minimum of ______ amps.

30 amps

Secondary circuits of current and potential instrument transformers shall be grounded where the primary windings are connected to circuits of at least _____ volts or more to ground.

300 volts Section 250.170

Feeders with common neutral may serve a maximum of two sets of ______ wire feeders shall be permitted to utilize a common neutral.

4 wire feeders Section 215.4.4

Where hte maximum total voltage drop on both feeders and branch circuits to the farthest outlet from exceeding ______ percent.

5 percent Section 210.19

A domestic clothes dryer branch circuit shall have its minimum load figured at ___ watts or the nameplate rating, whichever is larger.

5000 watts

For a wye-start, delta-run connected motor the selection of conductors between the controller and motor shall be based on _____ percent of the motor full-load current.

58 % Section 430.16 (c)

The dedicated electrical space above a motor control center shall be _____ feet or to the structural ceiling whichever is lower.

6 1/2 feet Section 110.26

In an existing dwelling, the minimum headroom clearance required above a 200 amp panel board is _____ feet.

6 1/2 feet Section 110.26 (3)

Electrode spacing where more than one electrode are used, each electrode of one grounding system shall not be less than _____ feet any other electrode of a grounding system.

6 feet Section 250.53 (3)

U pulls or angle pulls are made of a junction box the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than _______ times

6 times Section 314.28 (2)

Termination provisions of equipment for circuits rated 100 amperes or less shall use only one of the following _____ ampacity of the conductor size.

60 C Section 110.14 (C)(1)

A branch circuit that supplies only one range could be defined by the code as all of the following, except _____ branch circuit.

Verify answer

Enclosure for electrical installations shall have a fence when used outdoors to deter access by persons who are not qualified and the fence shall not be less than ___ feet.

7 feet Section 110.31

Live part of electrical equipment operating at 50 volts or more shall be guarded against accidental contact by elevation of _____ feet above the floor or other working surface.

8 feet Section 110.27 (A)(4)

When nonmetallic or metal-enclosed equipment is accessible to the general public and the bottom of the enclosure is less than ______ feet above the floor or grade level, the enclosure door or hinged cover shall be kept locked.

8 feet Section 110.32 (D)

Elevation of unguarded live parts above working space over 600 volts shall have ______ feet.

9 feet Section Table 110.34 (E)

The current ampacity, which a conductor that can carry continuously under the conditions of use without exceeding its temperature rating is defined as ______.

Amperes Section 100

Recessed portions of type IC lighting fixtures enclosures, other than at points of support shall be spaced at least ________ inches from combustible material.

1/2 inches Section 410.116

In damp and wet locations, to prevent moisture or water from enetering with the cabinet or cutout box and shall be mounted so there are at least ______ airspace between the wall and outer supporting surface.

1/4 inches section 312.2

Where the length of the tap conductors does not exceed ______ feet and the tap conductors comply with the ampacity of hte tap conductors.

10 feet. section 240.21

In a dwelling unit, where additional A/C equipment is required calculated load of the first 8 KVA requires a minimum ______ amp service.

100 amps Section 220.83

The vertical clearance from the ground for serice drop over residential property and driveways, and those commercial areas not subject to truck traffic is ______ feet where the voltage does not exceed 300 volts to ground.

12 feet Section 230.24

Show window shall hav at least one receptalce outlet install directly above a show window for each ______ feet or major fraction thereof of show window area measured horizontally at its maximum width.

12 feet Section 210.62

Dry-type transformers exceeding 112 1/2 kva shall not be located within _______ inches of combustible of building unless the transformer has a class 155 insulation system or higher.

12 inches section 450.22

In dwelling units and guest rooms of hotels, motels, and simular occupancies, the voltage shall not exceed _____ volts.

120 volts Section 210.6

The load of a single motor on its branch circuit conductors shall not exceed a maximum of _____ percent of the conductor ampacity.

125 percent Section 430.22

The clearance to amusement ride and attractions shall be maintained not less than _____ feet in any direction from overhead conductor operating at 600 volts or less.

15 feet Section 525.5 (b)(1)

This CODE cover the installation of electric conductors, installations used by the ______ utility.

Electric

Lighting fixtures located in the areas subject to moisture of dampness, such as roofed open porches, shall be ________.

Marked as suitable for use in wet or damp locations Section 410.10 (A)

A 4 wire, delta- connected secondary feeder, the phase conductor with the higher voltage to ground identified with outer finish of ______ or be tagged.

Orange Section 110.15

Conductors installed in subsurface enclosures into which persons enter for installation and maintenance shall be _______.

Racked Section 110.74

No grounded conductor shall be attached to any terminal or lead so as to _____ the designated polarity.

Reverse Section 209.1

The purpose of this CODE is the practical _____ of persons and property from hazards arising from the use of electricity.

Safeguarding Section 90.1

Where more than one nominal voltage system exists in a building, each ungrounded conductor of a multi-wire branch circuit, where accessbile, shall be identified by ________.

Separate color coding.

Electrical equipment ________ used wooden plugs in masonry, concrete, plaster or simular material.

Shall not be Section 110.13

This CODE does not cover the following installations

Underground in mines Section 90.2.2 (B)(2)

Where the condition of maintenance and supervision ensure that only qualified persons service the installation, grounded conductors in multi-conductor cables shall be permitted to be permanently identified at their terminations at the time of installation by a distictive ______ color marking.

White Section 200.6 (E)

The following shall be used for only the grounded circuit conductor: Where a cable assembly contains an insulated conductor for single-pole, 3 way or 4 way switch loops and the conductor with ______ insulated color shall be used.

White or Gray Section 200.7 (c)(1)

A INSULATED conductor is one that is ______ within material of composition.

encased Section 100

A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.

nonlinear Section 100

In dwelling units, a multi-wire branch circuit supplying more than one device or equipment on the same yoke shall provide with a means of disconnect simultaneously all ______ conductors a the panel-board.

ungrounded Section 210.7

Branch circuits required for the purpose of lighting, central alam, signal, communications, or other needs for public or common area of a two family or multifamily dwelling ______ supplied from the quipment that supplies an individual dwelling unit.

verify answer section

Receptacles, plugs and connectors shall have the terminal intended for connection and the grounded conductor identified as ______.

white Section 200.9