Maintenance Exam 2 – NEC Basics

Where overcurrent protection is provided as part of an industrial machine, the machine shall be marked _______?

Bare conductors in auxiliary gutters shall be securely and rigidly supported so that the minimum clearance between current-carrying metal parts of different potential mounted on the same surface will not be less than 2”, nor less than ________, for parts in free air.

A motor terminal housing enclosed rigidly mounted motor terminal shall have a minimum of ______ between the line terminals for a 230 volt motor.

Dry-type transformers installed indoors rated over _____ shall be installed in a vault.

In a cablebus, the size and number of the conductors shall be that for which the cablebus is designed, and in no case smaller than _____ AWG.

The branch-circuit protective device can serve as the controller for a stationary motor rated at _____ or less that is normally left running and cannot be damaged by overload or failure to start.

Each length of HDPE conduit shall be clearly and durably marked not less than every _____’

Busways shall be securely supported, unless otherwise designed and marked as such, at intervals not to exceed ______.

Capacitors containing more than ______ of flammable liquid shall be enclosed in vaults or outdoor fenced enclosures.

When an overloaded device sized in accordance with 430.32(A)(1) and (B)(1) is not sufficient to start the motor, higher–size sensing elements shall be permitted if the trip current does not exceed ______ percent of the motor nameplate full-load current rating, when the motor is marked with a service factor of 1.12.

The disconnecting means for a torque motor shall have an ampere rating of at least ______ percent of the motor nameplate current.

Transformer vaults containing more than _______ total kVA transformer capacity shall be provided with a drain or other means that will carry off any accumulation of oil or water in the vault, unless impracticable.

Circuit breakers rated at ______ amperes or less and ______ volts or less shall have the ampere rating molded, stamped, etched, or similarly marked into their handles or escutcheon areas.

Circuits and equipment operating at less than 50 volt shall have receptacles that are rated at not less than ____.

For straight pulls, the length of the pull box shall not be less than ______ times the outside diameter, over the sheath, of the largest shielded or lead-covered conductor or cable entering the box on systems over 600 volts.

For angle or U-pull, the distance between the shielded conductor entry (for systems over 600 volt, nominal) and the opposite wall of the box shall not be less than ______ times the outside diameter of the largest cable or conductor.

The distance between a shielded cable or conductor entry and its exit from the box shall not be less than ______ times the outside diameter of that cable or conductor on a system of over 600 volt.

Connection by means of wire-binding screws, studs, or nuts having upturned lugs or the equivalent shall be permitted for ______ or smaller conductors.

Conductors supplying outlets for arc and xenon projectors of the professional type shall not be smaller than _______ and shall have an ampacity not less than the projector rating.

For switchboards that are not totally enclosed, a space of ______ or more shall be provided between the top of the switchboard and any combustible ceiling.

Electric –discharge luminaires having an open-circuit voltage exceeding ______ shall not be installed in or on dwelling occupancies.

On electric space-heating cables, blue leads indicate a cable rated for use on a nominal circuit voltage of _______.

A disconnecting means that serves a hermetic refrigerant motor-compressor shall have an ampere rating of at least ____ percent of the nameplate rated-load current of branch-circuit selection current, whichever is greater.

The maximum size of conductors in Type UF cable shall be _____ AWG.

The minimum size parallel conductors permitted for elevator lighting shall be ______, provided the combined ampacity is equivalent to at least that of a 14 AWG conductor.

Motor control circuit transformers, with a primary current rating of less than 2 amp, can have the primary protection device set at no more that _______ percent of the rated primary current rating.

A building disconnecting means that supplies only limited loads of a single branch circuit shall have a rating of not less than ______.

For installations consisting of not more than two 2-wire branch circuits, the building disconnecting means shall have a rating of not less than ______.

General-purpose branch circuits wired with flat conductor cable shall not be rated more than ____.

The rating of the attachment plug and receptacle shall not exceed ______ at 250 volt for a cord-and-plug-connection a/c motor-compressor.

Fixture wires of 18 AWG or 16 AWG, shall be permitted for the control and operating circuits of x-ray equipment when protected by an overcurrent device not larger than ____.

Pilot lights, instruments, potential transformers, current transformers, and other switchboard devices with potential coils shall be supplied by a circuit that is protected by overcurrent devices rated ______.

Conductors for an appliance circuit supplying more than one appliance or appliance receptacle in an installation operating at less than 50 volt shall not be smaller than _____ AWG copper or equivalent.

The minimum size copper conductor permitted for Type MC cable is ______

The conductors contained with Type ITC cable shall be rated 300 volts, and not smaller than ______ AWG nor larger than ______ AWG.

Galvanized steel, stainless steel, and red brass RMC shall be permitted in or under cinder fill subject to permanent moisture, when protected on all side by a layer of nocinder concrete not less than ______ thick.

Where the conductor material is not specified, the sizes given in this Code shall apply to _____________ conductors.

Termination provisions of equipment for circuits rated 100 amps or less shall be used only for conductors rated ____ degrees C.

Termination provisions of equipment for circuits rated over 100 amps shall be used only for conductors rated ____ degrees C.

Arc Flash labels are only required on the main incoming service.

Disconnects shall be legibly marked indicating its _________.

What is the minimum working space for equipment 480V with live parts on both side of the working space?

The width of the working space in front of the equipment shall be the width of the equipment or ______.

The working space for 240V equipment with a concrete on the other side of the exposed live parts is _____.

What is the minimum height of working space above electrical equipment 480V rated?

Equipment rated over _____ Amps or more, located in a room. The doors shall open in the direction of egress.

Conductors with _____ marked on the insulation are NOT approved for use in a wet location.

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 _____.

Which one of the following listed circuit breakers 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 luminaires or devices shall be _____ .

In general, overhead service-drop conductors shall NOT be smaller than _____.

Why is electrical continuity required for metallic conduit?

In dwelling units, receptacle outlets installed for countertop surfaces, must be located above, but NOT more than _____ above the countertop or work surface.

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.

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.

Which of the following shall not be located over the steps of a stairway?

Where a permanently installed outdoor swimming pool is located on residential or commercial properties, at least one (1) single-phase, 125-volt, 15- or 20-ampere receptacle shall be located not less than _____ from and not more than _____ from the inside wall of the swimming pool.

Metal water pipes installed in or attached to a building or structure shall be bonded to _____.

When armored cable, Type AC, is installed in an accessible attic and is run parallel to the sides of rafters, studs, or floor joists, _____.

Generally, in a movie theater the manual switch for controlling the emergency lighting systems is permitted to be located _____.

Single-conductor cable such as _____ and single-conductor cable listed and identified as solar photovoltaic (PV) wire are permitted for use in PV source circuits within the PV array.

For dwelling units, GFCI protection is required for all single-phase, 125-volt, 15- and 20-ampere receptacles installed within six (6) feet of the top inside edge of the bowl of sinks located in _____.

For a building or structure where the meter enclosure is adjacent to the service disconnecting means, it is permitted to ground the meter enclosure to the _____ conductor on the load side of the service disconnect if ground-fault protection is not provided.

Where a 125-volt, 15-ampere receptacle is connected to a 120-volt branch circuit supplying two (2) or more receptacles or outlets, the maximum permitted cord-and-plug-connected load to the receptacle is _____.

According to the NEC, fixed outdoor deicing and snow melting equipment is to be considered as a _____ load.

In industrial establishments only, when a 200-ampere rated busway is tapped from a 600-ampere rated busway, what is the maximum permitted length of the 200-ampere busway where overcurrent protection is not provided for the 200-ampere busway?

When installing nonmetallic sheathed cable enclosed in an underground buried PVC conduit, the cable _____.

In regard to a commercial building, where a service-entrance conduit having a length of six (6) feet contains four (4) size 2 AWG THWN insulated copper current-carrying conductors, each of the conductors have an allowable ampacity of _____.

The workspace width shall be the width of the equipment or 30″ whichever is greater.

Equipment used outdoors and exposed to rain, snow and sleet must be type _____.

What is the minimum size of a rectangular manhole?

A grounding conductor is what color?

What is the minimum weight of a manhole cover?

A grounded conductor is what color?

An insulated conductor that is intended for use as a grounded conductor where contained in a flexible cord shall be identified by what color?

480 Volt lighting in a parking lot is required to be at what height?

277 Volt lighting in a tunnel is required to no be less than _____.

GFCI protection in a dwelling unit is required in _____.

Branch circuit ratings are identified as circuits under what amperage?

Branch circuits are not allowed to exceed what percentage of voltage drop?

Feeder circuits are not allowed to exceed what percentage of voltage drop?

In no case shall both branch and feeder circuits exceed what percentage of voltage drop?

Continuous loads are loads that are expected to run for how many hours?