Practice Exam: Section 1

At least ------- entrance of sufficient area shall be provided to give access to and egress from working space about electrical equipment.

1

Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than -------- in. at the edge of the cabinet or cutout box employing a flush-type cover.

1/8

Where the assembly, including the overcurrent devices protecting the feeder(s), is listed for operation at ----- percent of its rating, the allowable ampacity of the feeder conductors shall be permitted to be not less than the sum of the continuous load plus the noncontinuous load

100

What is the maximum allowable ampacity for No. 12 copper conductors type THHN, 167 F rated insulation, installed in an ambient temperature of 30 C. with 27 current carrying conductors in the same recovery.

11.25

What is the maximum allowable ampacity for No. 2/0 copper conductors type THHN, 167 F rated insulation, installed in an ambient temperature of 30 C. There are 2 current carrying conductors in the cable.

115

What is the maximum allowable distance between trade size 1 RMC supports in feet

12

At least one receptacle outlet shall be installed within 450 mm (18 in) of the top of a show window for each or major fraction thereof of show window area measured horizontally at its maximum width.

12 linear ft

LFMC shall be securely fastened in place by an approved means within ---in. of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed --- ft. Exceptions ignored.

12, 4 1/2

The required branch circuit copper conductor size for taps of a 15 amp rated circuit is No. ------

14

Overhead spans of open conductors and open multiconductor cables of not over 600 volts, nominal, shall have a clearance of not less than ---- ft for those areas listed in the 12-ft classification where the voltage exceeds 300 volts to ground.

15

18. A dwelling has a floor area of 2000 sq. ft exclusive of an unfinished cellar not adaptable for future use, unfinished attic, and open porches. It has a 12-kW range, a 4.5-kW water heater, a 1 .2-kW dishwasher, a 5-kW clothes dryer, and a 2 1/2-ton (24-A) heat pump with 15 kW of backup heat. What is the total heatin g and cooling load in VA units.

15,510

Small Appliance Circuit Load. In each dwelling unit, the load shall be calculated at ------- for each 2-wire mall-appliance branch circuit as covered by 210.1 1(C)(I). Where the load is subdivided through two or more feeders, the calculated load for each shall include not less than ------ for each 2-wire small appliance branch circuit

1500 volt-amperes

What is the maximum number of conductors or fixture wires that can be used in electrical metallic tubing for No. 14 Type THHW conductors in trade size 27 tubing.

16

Overhead spans of open conductors and open multiconductor cables of not over 600 volts, nominal, shall have a clearance of not less than ----- ft over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than residential property, and other land traversed by vehicles, such as cultivated, grazing, forest, and orchard.

18

A dwelling has a floor area of 1500 sq. ft, with unfinished cellar not adaptable for future use, unfinished attic, and open porches. Appliances are a 12-kW range and a 5.5-kW, 240-V dryer. Assume range and dryer kW ratings equivalent to kVA ratings in accordance with 220.54 and 220.55. What is the total net calculated load for the dwelling in VA units

18, 600

A ground ring encircling the building or structure, in direct contact with the earth, consisting of at least 20 ft of bare copper conductor not smaller than ----- AWG shall be permitted to be used as a grounding electrode.

2

A unit load of not less than ------ VA per square foot is required for general lighting in Restaruant occupancies.

2

Plate electrodes are permitted to be used for grounding electrodes if each plate electrode is expose not less than ------ sq. ft of surface to exterior soil.

2

Conductors shall be considered outside of a building or other structure where they are installed under not less than ---- in. of concrete beneath a building or other structure or where the are installed within a building or other structure in a raceway that is encased in concrete or brick not less than ---- in. thick

2, 2

The dwelling has a floor area of 1500 sq. ft. exclusive of an unfinished cellar not adaptable for future use, unfinished attic, and open porches. It has two 20-A small appliance circuits, one 20-A laundry circuit, two 4-kW wallmounted ovens, one 5.1 -kW counter-mounted cooking unit, a 4.5-kW water heater, a 1 .2-kW dishwasher, a 5-kW combination clothes washer and dryer, six 7-A, 230-V room air-conditioning units, and a 1 .5-kW, 230 V permanently installed bathroom space heater. Assume wall-mounted ovens, countermounted cooking unit, water heater, dishwasher, and combination clothes washer and dryer kW ratings equivalent to kVA. Assuming the dwelling is feed by a 120/240-V, 3-wire, single-phase service what is the total

29, 200 VA, 122 A

Continuous Load is a load where the maximum current is expected to continue for ---- hours or more.

3

In dwelling units, at least one receptable outlet shall be installed in bathrooms within ----- of the outside edge of each basin and the receptacle outlet shall be located on a wall or partition that is adjacent to the basin or basin countertop, located on the countertop, or installed on the side or face of the basin cabinet not more than 300 mm (12 in.) below the countertop. Receptacle outlet assemblies listed for the application shall be permitted to be installed in the countertop.

3 ft

IMC shall be securely fastened within ----- ft of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination. Fastening shall be permitted to be increased to a distance of --- ft where structural members do not readily permit fastening at the standard minimum distance. Exceptions ignored.

3, 5

A grounding electrode system consisting of a ground ring shall be bruied at a depth below the earth's surface of not less than ---- in.

30

What is the minimum bending radius in inches for 3/4" EMT using a Full Shoe bender.

4.5

In a 40 amp range circuit the ampere rating of a range receptacle shall be permitted to be ------ amps.

40, 50, 40 or 50

What is the demand factor percentage for 9 household electric clothes dryers in a multi-family dwelling unit.

55

What is the maximum allowable ampacity for No. 6 aluminum conductors type THHN, 194 F rated insulation, installed in an ambient temperature of 30 C. There are 3 current carrying conductors in the cable.

55

At least -------- in. of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for splices or the connection of luminaries (fixtures) or devices. Exception ignored.

6

For residential branch circuits rated 120 volts or less with GFIC protection and maximum overcurrent protection of 20 amperes, What is the minimum burial depth in inches in a trench below 2-in. thick concrete or equivalent.

6

In general receptacles shall be not less than ------- ft from the inside walls of a pool

6

All switches and circuit breakers used as switches shal e located so that they may be operated from a readily accessible place and shall be installed such that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than above the floor or working platform. Exceptions ignored

6 ft 7 in.

Overcurrent devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker when in its highest position, is not more than 6 ft --- in. above the floor or working

7

55. The calculated lighting load for an office building is 24,500 VA. What is the maximum sq ft that the office could have if this were the lighting load.

7000

Rod and pipe grounding electrodes shall not be less than -----ft in length and shall consist of the code specified materials.

8

Where more than one ground rod is used for grounding the electrodes, each electrode of one grounding system (including that used for strike termination devices) shall not be less than -------- ft from any other electrode of another grounding system

8

Overhead spans of open conductors and open multiconductor cables shall have a vertical clearance of not less than ------ ft above the roof surface. The vertical clearance above the roof level shall be maintained for a distance not less than ft in all directions from the edge of the roof. Exceptions ignored.

8 ,3

Conductors shall be permitted to be terminated based on the ----- C temperature rating and ampacity as given in Table 310.60(C)(67) through Table 310.60(C)(86), unless otherwise identified

90

An insulated grounded conductor of 6 AWG or smaller shall be identified by -------

A continuous white outer finish, A continuous gray outer finish, Three continuous white strips along the conductor's entire length on other than green insulation, Wires that have their outer covering finished to show a white or gray color but have colored tracer threads in the braid identifying the source of manufactture shall be considered as meeting the provisions of this section.

Bonding Conductor or Jumper

A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.

FMC ------- connectors shall not be concealed.

Angle

A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected

Bonding Jumper

------- meeting the requirements of this article shall be used around impaired connections, such as reducing washers or oversized, concentric, or eccentric knockouts. Standard locknuts or bushings shall not be the only means for the bonding required by this section but shall be permitted to be installed to make a mechanical connection of the raceway(s).

Bonding Jumpers

Receptacles rated 20 amperes or less and designed for the direct connection of aluminum conductors shall be marked --------

CO/ALR

All ------- of the same circuit and, where used, the grounded conductor and all equipment grounding conductors and bonding conductors shall be contained within the same raceway, auxiliary gutter, cable tray, cable bus assembly, trench, cable, or cord. Exceptions excluded.

Conductors

A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.

Controller

The grounding electrode conductor material selected shall be resistant to any ------ condition existing at the installation or shall be protected against corrosion.

Corrosive

Cabinets and cutout boxes shall have sufficient space to accommodate all conductors installed in them without ------.

Crowding

A building or structure electrical disconnecting means can be ---------

Electrically operated

The use of EMT shall be permitted for --------- work.

Exposed and Concealed

Overhead Service, where not in excess of 600 volts, nominal, shall follow minimum clearances measured from --------.

Final grade

Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be made so that the possible spread of fire or products of combustion will not be substantially increased. Openings around electrical penetrations into or through fire-resistant-rated walls, partitions, floors, or ceilings shall be ------ using approved methods to maintain the fire resistance rating.

Firestopped

Conductors, other than, -------- shall be protected against overcurrent in accordance with their ampacities

Flexible cords, flexible cables, abd fixture wires

An uninsulated equipment grounding conductor shall be permitted, but, if individually covered, the covering shall have a continuous outer finish that is --------

Green or Green with Yellow Strips

In locations where electric equipment is likely to be exposed to physical damage, enclosures, or ----- shall be so arranged and of such strength as to prevent such damage.

Guards

Which of the following is not considered a special purpose branch circuit as outlined in the code.

High pressure sodium parking lot lighting

Switches and circuit breakers used as disconnecting means shall be of the ------- type

Indicating

Signs and outline lighting systems shall be marked with the manufacturer's name, trademark, or other means of identification, and ---------

Input voltage and current rating

Unless required elsewhere in this Code, equipment grounding conductors shall be permitted to be bare, covered, or --------. Expections ignored.

Insulated

A applied to circuit breakers, a qualifying term indicating that there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases

Inverse Time

For branch circuits not more than 600 volts, branch-circuit conductors shall have an ampacity not less than the ------ load to be served

Maximum

------- of conductors on buildings, structures, or poles shall be as provided for services in 230.50.

Mechanical Protection

The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system

Neutral Point

Throughout the Code, the voltage considered shall be that at which the circuit operates, and the voltage rating of electrical equipment shall not be less than the ------ of a circuit to which it is connected.

Nominal Voltage

The feeder conductor ampacity shall ------- that of the service conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of 55 amperes or less. Exceptions ignored

Not be less than

A building or other structure served shall be supplied by ------ services. Exceptions ignored.

Only One

---------- shall be provided to give safe access to the working space around electric equipment installed on platforms, balconies, or mezzanine floors or in attic or roof rooms or spaces.

Permanent ladders or stairways

Where practicable, rod, pipe, and plate electrodes shall be embedded below ------- Rod, pipe, and plate electrodes shall be free from nonconductive coatings such as paint or enamel.

Permanent moisture level

A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system

Plenum

A device that establishes a connection between two or more conductors or between one or more conductors and a terminal by means of mechanical pressure and without the use of solder

Pressure Connector

Any nonconductive paint, enamel, or similar coating shall be -------- at threads, contact points, and contact surfaces or be connected by means of fittings designed so as to make such removal unnecessary

Removed

Each conductor that originates outside the box and terminates or is spliced within the box shall be counted once, and each conductor that passes through the box without splice or termination --------

Shall be counted once

Each building or structure disconnect shall -------- disconnect all ungrounded supply conductors it controls and shall have a faultclosing rating not less than the maximum available short-circuit current available at its supply terminals. Exceptions ignored

Simultaneously

Where outdoor lampholders are attached as pendants, the connections to the circuit wires shall be -------

Staggered

The copper sheath of mineral-insulated, metal-sheathed cable may be used as the equipment grounding conductor

This is true

Electrical Nonmetallic Tubing (ENT) is not permitted to be used in any building not exceeding ------- floors above grade, unless a fire sprinkler system(s) is installed in accordance with NFPA 13-2002, Standard for the Installation of Sprinkler Systems, on all floors.

Three

55. A cable with insulated conductors enclosed within an overall, corrosion resistant, nonmetallic jacket describes what type of cable.

Type NMC

The NEC (National Electrical Code) provided that the number of wires and circuits confined in a single enclosure be ------ Limiting the number of circuits in a single enclosure minimizes the effects from a short circuit or ground fault in one circuit

Varyingly Restricted

Service disconnecting means shall not be installed in ----

bathrooms

Normally non-current-carrying conductive materials enclosing electrical conductors or equipment, or forming pan of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.

bonding of electrical equipment

Parts of electric equipment that in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all --------

combustible material

Raceways shall be provided with expansion fittings where necessary to for ------- thermal expansion and contraction

compensate

Nonmetallic boxes shall be permitted only with open wiring on insulators, ------------- cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways. Exceptions ignored.

concealed knob and tube wiring

Where a submersible pump is used in a metal well casing, the well casing shall be ------ to the pump circuit equipment grounding conductor.

connected

The grounding electrode conductor shall be ------.

copper, aluminum, or copper-clad aluminum

A receptacle installed outdoors in a location protected from the weather or in other damp locations shall have an enclosure for the receptacle that is weatherproof when the receptacle is ------.

covered

All wet niche swimming pool luminaries shall be removable from the water for relamping or normal maintenance. Luminaries shall be installed in such a manner that personnel can reach the luminaire for relamping, maintenance, or inspection while on the deck or equivalently ------

dry location

55. Unbroken lengths of busway shall be permitted to be extended through -----.

dry walls

Where the load is calculated on the basis of volt-amperes per square meter or per square foot, the wiring system up to and including the branch circuit panelboard(s) shall be provided to serve not less than the calculated load. This load shall be ------- among multioutlet branch circuits within the panelboard(s). Branch-circuit overcurrent devices and circuits shall only be required to be installed to serve the connected load.

evenly proportioned

"Completed wiring installations shall be free from short circuits and from other than as required or permitted in Article 250. Completed wiring installations shall be free from short circuits, or any connections to ground other than as required or permitted elsewhere in this Code."

ground falls

Where conductors carrying alternating current are installed in ferrous metal enclosures or ferrous metal raceways, they shall be arranged so as to avoid heating the surrounding ferrous metal by induction by -------- Exceptions ignored.

grouping all phase conductors together

Disconnecting means shall be capable of being locked ------------. The provisions for locking shall remain in place with or without the lock installed.

in the open position

For attics and underfloor spaces containing equipment requiring servicing, such as heating, air-conditioning, and refrigeration equipment, at least one -------- containing a switch or controlled by a wall switch shall be installed in such spaces. At least one point of control shall be at the usual point of entry to these spaces.

lighting outlet

The equipment grounding conductor run with or enclosing the circuit conductors may in the form of a wire or a busbar --------.

of any shape

Bends shall be made so that the tubing is not damaged and the internal diameter of the tubing is not effectively ---------

reduced

55. A 6 AWG grounding electrode conductor that is free from exposure to physical damage shall be permitted to be run along the surface of the building construction without metal covering or protection where it is -------.

securely fastened to the construction

92. No small-appliance branch circuit ------ shall

serve more than one kitchen

Maximum Number of Disconnects, Two or three single-pole switches or breakers capable of individual operation shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect, provided they are equipped with identified handle ties or a master handle to disconnect all ungrounded conductors with no more than ------- operations of the hand

six

Surge arresters installed in accordance with the requirements of Article 280 shall be permitted on each -------- overhead service conductor.

ungrounded

Bonding jumpers shall be of copper or other corrosion-resistant material, a bonding jumper shall be a ------ or similar suitable conductor

wire, bus, or screw