NEC Basics – Practice

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

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.

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?

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 _____.

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.

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.

In a dwelling unit where a 125-volt, 15- or 20-ampere receptacle is located under the counter for an in-sink waste disposer, the receptacle must be provided with _____.

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 work space 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?

Covered conductors are recognized by the Code

Where conductors supply continuous loads the conductor shall have an ampacity rating not less than what percentage?

What is the maximum ampacity of a 20 amp breaker?

What is the minimum size conductor for 20A branch circuit?

What is the minimum size conductor for 15A branch circuit?

What is the minimum length/space of a wall

Cord and plug type equipment not fastened in place shall not exceed what percentage of the branch circuit ampere rating?

Cord and plug type equipment fastened in place shall not exceed what percentage of the branch circuit ampere rating?

Receptacles shall be installed so that at no point the wall space is greater than _____’ from a receptacle outlet.

A least 1 receptacle outlet shall be accessible from the deck, balcony, or porch. The outlet shall not be located more than _______ above the deck, balcony, or porch.

In each attached garage and in each detached garage with electric power, at least one receptacle outlet shall be installed in each vehicle bay and not more than ______.

Receptacle outlets shall be calculated at not less than ______ va for each single yoke.

In general how many receptacles can be installed on a single 120V 20 amp circuit?

What is the minimum va for a clothes dryer?

If the AC load is 15,000va and the heating load is 20,000va which one is used when calculating total load?

For 1000 volts, nominal or less what is the minimum size copper conductor for spans up to 50′?

For over 1000 volts, nominal what is the minimum size copper conductor in a cable?

Over what length would 12 awg festoon lighting need to be supported by a messenger wire?

What is the minimum size AWG for festoon lighting?

What is the minimum clearance for conductors less than 1000 volts over a side walk?

What is the minimum distance that conductors, weatherheads, and service entrances, shall be kept from windows, doors, porches, balconies, and fire escapes?

Trees are allowed to be used as supports for overhead conductors.

What is the maximum number of disconnecting means per supply?

Underground service entrance conductors are not permitted in.

The minimum underground service entrance conductor in copper is.

What is the minimum size for single conductors in cable tray as a service entrance.

What is the maximum continuous load for 18 AWG copper.

What is the maximum continuous load for 16 AWG copper.

What is the maximum continuous load for 12 AWG copper.

Fixture wires are allowed to be tapped to a branch circuit. What is the minimum size for a 20 amp circuit.

What size conductor is required for field assembled extension cords, with flexible cords and separately listed and installed components supplied by a 20 amp branch circuit.

Which of the follow is not a standard ampere rating for a circuit breaker.

Which of the follow is not a standard ampere rating for a circuit breaker.

Which of the follow is not a standard ampere rating for a fuse.

Circuit breakers shall open all grounded conductors.

For tap conductors that don’t exceed 10′ in length, and the conductors leave the enclosure in which the tap is made, the ampacity of the tap conductors shall not be less than ________ of the rating of the overcurrent protective device.

Tap conductors supplying a transformer not over 25′ in length, the tap conductor shall have an ampacity rating of at least ________ the rating of the overcurrent protective device.

Plug Edison-Base fuses shall be classified at not over 125 volts and ______ amps and below.

Circuit breakers shall clearly indicate whether they are on or off. In the up position a breaker shall be off.

Circuit breakers used as switches in 120 volt and 277 volt fluorescent lighting shall be marked.

Circuit breakers used as switches in 120 volt and 277 volt high-intensity lighting shall be marked.

Breakers that are marked SWD are approved to control light fixtures of what type.

If a panel is straight rated 480v what type of rating(s) are the breakers required to have?

If a panel is slash rated 480/277v what type of rating(s) are the breakers required to have?

Receptacles are not allowed to be installed horizontally.

Which of the following are not permitted for use as a grounding electrode?

Receptacles shall not be installed in a _________ position in countertop surfaces or work surfaces.

Aluminum, copper-clad aluminum, or copper conductors, for each phase, polarity, neutral, or grounded circuit shall be permitted to be connected in parallel only in sizes __________ and larger.

Where the supplemental electrode is a rod, pipe, or plate electrode, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than _________ copper wire.

An electrode encased by at least 2″ of concrete shall be permitted to be 20′ of base copper conductor not smaller than _________ AWG

Where the service-entrance phase conductors are installed in parallel, in two or more raceways, the size of the grounded conductor in each raceway shall not be smaller than _______ AWG

Overhead service-drop conductors shall not be smaller than ________ copper.

Fixtures wires shall not be smaller than ________ AWG

Overhead conductors for festoon lighting shall not be smaller than ________ unless the conductors are supported by messenger wires.

Show windows must be calculated either at 200 volt-amps per _________ of show window, or the unit load per outlet as required in other provisions of article 220.14

What is the minimum computed branch circuit load, in volt-amps, allowed by the NEC for a branch circuit serviing an exterior electric sign, when calculating a building or structure’s total load?

If a warehouse uses mercury vapor lighting in the storage area, and the storage area is 40,500 square feet of space, what is the minimum lighting load?

An insulated grounded conductor larger then _______ shall be permitted to be marked with white tape at the time of installation.

Live parts of electrical equipment operating at ________ nominal shall be guarded against accidental contact.

Connection by means of wire-binding screws or studs and nuts that have upturned lugs or the equivalent shall be permitted for _________ AWG or smaller conductors.

What is the lighting demand factor in hospitals.

If each unit in a 12 unit condo had an 8kW electric range, applying the optional method of calculation for multifamily dwellings, what would the calculated demand load be on the ungrounded service entrance conductors for the electric ranges?