Quiz 13

Where connected to a branch circuit having a rating in excess of 20 amperes, lampholders shall be of ____ and such lampholder shall have a rating of not less than 660 watts if of the admedium type, or not less than 750 watts if of any other type. A. high voltage B. high amperage C. heavy duty type D. rough use

C. heavy duty type Article 210.21 Branch Circuits "Lampholders"

On a 4-wire, delta connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is ___ in color or by other effective means. A. red B. yellow C. orange D. black or red

C. orange Article 110.15 General Requirements "High Leg Marking"

Where oil switches or air, oil, vacuum, or sulfur hexaflouride circuit breakers constitute a building disconnecting means, an isolating switch with ____ and meeting the requirements of 230.204.(B), (C), and (D) shall be installed on the supply side of the disconnecting means and all associated equipment. A. visible break contacts B. an explosionproof housing C. a hand operated lever D. none of the above

A. visible break contacts See 230.204 Service and also 225.51 Outside Wiring both are refering tp "Isolating Switches"

Electrical equipment that depends on the natural circulation of air and ____ for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment. A. independent fans B. heat sinks C. convection principles D. direct contact of cooling fins

C. convection principles Article 110 General Requirements 110.13(B) Mounting and Cooling Equipment

The minimum cover requirements for underground wiring 0 to 600 volts, in Type UF cable under streets, highways, roads, alleys, driveways and parling lots is ____ inches. A. 6 B. 12 C. 18 D. 24

D. 24 inches See Article 300 Wiring Methods Table 300.5 Min Cover Required 0-600 Volts

It shall be permissible to apply a demand factor of 75% to the nameplate rating load of ___ or more appliances fastened in place, other than electric ranges, clothes dryers, space heating equipment, or airconditioning equipment, that are served by the same feeder or service in a one family, two family or multifamily dwelling. A. one B. two C. three D. four

D. four Article 220.53 Branch Circuits Appliance Load Dwelling Unit

On overhead service-drop, individual conductors shall be insulated or covered, however, the ___ conductor of a multiconductor cable shall be permitted to be bare. A. grounding B. isolate hot leg C. ungrounded D. grounded

D. grounded See 230.22 Services

Where rock bottom is encountered in installing a grounding rod electrode, the electrode shall be driven at an oblique angle not to exceed ____ degrees from vertical or, where rock bottom is encountered at an angle up to 45 degrees. A. 30 B. 45 C. 60 D. 75

B 45 See Article 250.53 Grounding and Bonding. 45

What is the ampacity rating of a two conductor copper No. 8 Type SCE flexible cord rated at 60 degrees C with an ambient temperature of 30 degrees C? A. 60 B. 55 C. 48 D. 65

B. 55 Article 400 Cords, Table 400.5(A)(2)

An assembly of a fuse support with either fuse holder, fuse carrier or disconnecting blade. The fuse holder or fuse carrier may include a conducting element (fuse link) or may act as the disconnecting blade by the inclusion of a nonfusable member. A. disconnect B. cutout C. breaker D. fused switch

B. cutout See Article 100 Definitions Part II listed under "switching device"

Underground cable installed ____ shall be in a raceway. Exceptions ignored. A. in a basement B. under a building C. in an attic d. in a floor

B. under a building Article 300.5(C) Wiring Methods, underground installations

The NEC is not intended as a design specification or an instruction manual for ____. A. electrical engineers B. untrained persons C. power linemen D. none of the above

B. untrained persons Article 90 Introduction

Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed ____ ft for a nominal, 120 volt rating ____ ft for a nominal, 208 or 240 volt rating. A. 8, 10 B. 6, 4 C. 10, 6 D. 6, 3

C. 10, 6 See Article 440.64 AC & refrigeration supply cords

In a service installation for a dwelling what is the maximum feeder rating for 4/0 aluminum service conductors in amperes? A. 150 B. 175 C. 200 D. 225

C. 200 Table 310.15(B)(7) A feeder schedule for 120/240 3 wire single phase dwelling services ***REMEMBER THIS TABLE***

Branch circuits that supply neon tubing installations shall not be rated in excess of ____ amperes. A. 15 B. 20 C. 30 D. 40

C. 30 See Article 600.5 Signs

A multi family dwelling contains 11 units. What is the demand factor to be when calculating the service load. A. 50 B . 45 C. 42 D. 37

C. 42 See Article 220 Calculations Table 220.84 Optional Calculations - Demand Factor for Three or More Multifamily Dwelling Units

Splices and taps shall be permitted within gutters where they are accessible by means of removeable covers or doors. The conductors, including splices and taps, shall not fill the gutter more than ___% of its area. A. 25 B. 50 C. 75 D. 90

C. 75% see Article 366 Auxiliary Gutters *** No Tab **

Switches or circuit breakers shall not disconnect the ____ conductor of a circuit. Exceptions ignored. A. ungrounded B. energized C. grounded D. hot

C. grounded Article 404 Switches For this question think "neutral"

A unit load of less than ___ per sruare foot is required for general lighting in church occupancies. A. 1 VA B. 2 VA C. 3 VA D. 4 VA

A. 1 VA Article 220 Calculations Table 220.12 General Lighting Loads By Occupancy

A 125 volt single phase 15 or 20 ampere rated receptacle outlet shall be installed at an accessible location for the servicing of heating, airconditioning and refrigeration equipment, and the receptacle shall be located on the same level and within ____ ft of heating, air conditioning and refrigeration equipment. A. 25 B. 15 C. 10 D. 6

A. 25 Article 210.63 Branch Circuits

The normally non-current carrying metal parts of all service enclosures shall be effectively _____. A. bonded together B. insulated C. protected D. locked

A. bonded together Article 250.92 Bonding and Grounding; Bonding of Equipment for Services

A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. A. bonding jumper B. connection C. soldering D. welding

A. bonding jumper Article 100 Definitions

Equipment intended to interrupt current at fault levels shall have an interrupting rating not less than nominal circuit ____ and the current that is available at the line terminals of the equipment. A. voltage B. power C. resistance D. size

A. voltage Article 110.9 General Requirements; Interrupting Rating

In walls of concrete, tile, or other noncombustible material, cabinets shall be installed so that the front edge of the cabinet is not set back of the finished surface more than ____ inches. A. 1/8 B. 1/4 C. 3/8 D. 1/2

B. 1/4 See Article 312.3 Cabinets

Overhead spans of open conductors and multiconductor cables of not over 600 volts nominal, shall have a clearance of not less that ____ ft over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground. A. 10 B. 12 C. 14 D. 18

B. 12 Article 230.24 Services "Vertical Clearances"

Type MV cable shall not be used ____ unless identified for the use. A. in wet or dry locations B. in raceways C. where exposed to direct sunlight D. in messenger supported wiring

C. where exposed to direct sunlight See Article 328.12 Medium Voltage Cable Type MV *** No Tab ***

What is the adjustment factor percentage for more than three current carrying conductors in a raceway or cable if there are 4 current carrying conductors in a 3/4" EMT? A. 45 B. 50 C. 70 D. 80

D. 80 310 Conductors see Table 310.15(B)(3)(a) "Adjustment factors for more than three current carrying conductors in a raceway or cable"

Electrical equipment shall be firmly secured to the surface on which it is mounted, and wooden plugs driven into holes in masonry, concrete, plaster or similar materials shall A. be oversized to provide a tight fit B. be used to insulate the equipment from the mounting surface C. be a minimum 3/4" diameter D. not be used.

D. not be used. See 110 General Requirements

For circuits supplying loads consisting of motor-operated utilization equipment that is fastened in place and has a motor larger than ____ hp in combination with other loads, the total calculated load shall be based on ____ % of the largest motor load plus the sum of the other loads. A. 1/8; 125 B. 1/4; 110 C. 1/2; 150 D. 3/4; 80

A. 1/8; 125 Article 220.18(A) Calculations

The disconnecting means for each supply shall consist of not more than ____ switches or ___ circuit breakers mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard. A. 6, 6 B. 2, 2 C. 3, 3 D. 8, 8

A. 6, 6 See 225.33 Outside Wiring and also appears in 230.71 Services

Where a building or other structure that is served by a branch circuit or feeder on the load side of a service; disconnecting means shall be supplied by only ____. Ignoring all special conditions. A. one feeder or branch circuit B. a separate service C. multiple branch circuit feeders D. new service entrance cabling

A. only one feeder or branch circuit 225.30 Outside Wiring II "Buildings or other structures supplied by a feeder or branch circuit"

A means shall be provided in each metal box for the connection of an equipment grounding conductor. The means shall be permitted to be a _____ or equivilent. A. tapped hole B. toggle bolt C. cable clamp D. strap

A. tapped hole Article 314.40(D) Boxes

Receptacles and cord connections shall be rated not less than _____ amperes, 125 volts, or 250 volts, and shall be of a type not suitable for use as lampholders. A. 12 B. 15 C. 20 D.25

B. 15 Article 406.3 Receptacle Rating

Where used outside, aluminum or copper clad aluminum grounding electrode conductors shall not be terminated withing ___ in of the earth. A. 12 B. 18 C. 24 D. 36

B. 18 Article 250.64 Grounding and Bonding

A unit load of not less that ____ VA per sf is required for general lighting in Hospital occupancies. A. 1 B. 2 C. 3 D. 4

B. 2 Article 220 Calculations, Table 220.12 General Lighting Loads by Occupancy

Sheet metal auxilliary gutters shall be supported and secured throughout their entire length at intervals not exceeding _____ ft. A. 3 B. 5 C. 6 D. 8

B. 5 See Article 366.30 Auxilliary Gutters *** No Tab ***

A space not less than 3 feet shall be provided between the top of the switchboard and any combustible ceiling, unless a non-combustible shiels is provided between the switchboard and the ceiling or _____. A. the switchboard is in a controlled area B. the switchboard has no conductor with voltages in excess of 300 volts C. the switchboard is totally enclosed D. none of the above

C. the switchboard is totally enclosed Article 408.18 Switchboards and Panelboards

A warehouse storage area uses high pressure sodium lighting. What is the minimum lighting load in the warehouse area if it has 10,500 sq ft for storage? A. 2625 B. 5262 C. 3510 D. 31500

A. 2625 See Table 220.12 General Lighting Loads By Occupancy

For cord-and-plug connected equipment in other than storable pools, the fixture cords shall not exceed ____ ft in length. A. 3 B. 6 C. 10 D. 15

A. 3 Article 680.7(A) Pool, Spa, Hot Tub

250.52 Grounding Electrodes A metal underground water pipe in direct contact with the earth for ____ ft or more, including any metal well casing effectively bonded to the pipe, and electrically continuous, or made electrically continuous by bonding around insulating joints or insulating pipe, to the points of connection of the grounding electrode conductor and the bonding conductor or jumper if installed. A. 8 B. 10 C. 12 D. 15

B. 10 250.52(A)(1) metal u/g water pipe

Type UF cable may be used as follows: A. in storage battery room B. as service-entrance cable C. between a dwelling and separate garage unit D. where exposed to direct rays of the sun, unless identrified as sunlight resistant

C. between a dwelling and separate garage unit Article 340 Underground Feeder and Branch Circuit Cable Type UF

Operation of equipment in excess of normal, full load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or serious overheating. A fault such as a short circuit or ground fault is not an ____. A. ground fault B. arc fault C. overload D. short circuit

C. overload See Article 100 Definitions

_____shall not be used where conduits or connectors requiring the use of locknuts or bushings are to be connected to the side of the box. A. handy boxes B. octagon boxes C. square boxes D. round boxes

D. round boxes Article 314.2 Boxes

What is the maximum number of conductors or fixture wires that can be used in electrical metallic tubing for No. 14 Type THHN conductors in trade size 27 tubing? A. 22 B. 35 C. 61 D. 84

B. 35 See Annex C Table C1 See tab labeled "Raceway Fill Tables Annex C"

A device, group of devices, or other means whereby the conductors of a circuit can be disconnected from their source of supply. A. Switch B. Disconnecting means C. Closed circuit switch D. Relay switch

B. Disconnecting means Article 100 Definitions

Bare ____ grounding electrode conductors shall not be used where in direct contact with masonry or the earth or where subjected to corrosive conditions. A. aluminum B. copper C. copper clad aluminum D. aluminum or copper clad aluminum

D. aluminum or copper clad aluminum Article 250.64(A) Grounding and Bonding

Each commercial building and each commercial occupancy accessible to pedestrians shall be provided with at least one outlet in an accessible location at each ___ to each tenant space for sign or outline lighting system use. A. exit B. store front C. window D. entrance

D. entrance Article 600.5 Signs; Electric signs and Outline Lighting

Where an ac system is connected to a grounding electrode in or at a building or structure _____ electrode(s) shall be used to ground conductor enclosures and equipment in or on that building or structure. A. separate B. indepebdent C. non-bonded D. the same

D. the same See Article 250.58 common grounding electrode

Receptacle outlets in floors shall not be counted as part of the required number of receptacles unless located within ____ of the wall. A. 1 ft B. 1.5 ft C. 2 ft D. 8 inches

B. 1.5 ft Article 210.52(3) Branch Circuits "Floor Receptacles"

What is the allowable ampacity for a No. 14 fixture wire? A. 15 B. 17 C. 20 D. 25

B. 17 Article 402 Fixture Wires Table 402.5 Allowable Ampacity For Fixture Wires

The greatest root-mean-square (rms) (effective) difference of potential between any two conductors of the circuit concerned. A. amperage B. wattage C. voltage D. power factor

C. voltage Article 100 Definitions

Exposed, normally non-current carrying metal parts of fixed equipment supplied by or enclosing conductors or components that are likely to become enegized shall be connected to an equipment grounding conductor under any of the following conditions: A. Where within 8 ft vertically or 5 ft horizontally of ground or grounded metal objects and subject to contact by persons B. where located in a wet or damp location and not isolated C. where in electrical contact with metal D. provided with GFI protector where equipment operates with any terminal at over 150 volts to ground E. any of these

E. any of these 250.110 Grounding and Bonding

Wire connectors or splicing means installed on conductors for direct burial shall _____. A. be listed for such use B. not be used C. encased in concrete D. made waterproof

A. be listed for such use 110.14(B) General Requirements.... splicing

A receptacle outlet shall be installed wherever flexible cords with attachment plugs are used, and where flexible cords are permitted to be permanently connected, receptacles shall be ___ for such cords. A. permitted to be omitted B. installed C. permanently installed D. marked

A. permitted to be omitted 210 Branch Circuits II Required Outlets

Where the number of current carrying conductors in a raceway or cable exceeds _____, or where single conductors or multiconductor cable are installed without maintaining spacing for a continuous length than ____ inches and are not installed in raceways, the allowable ampacity of each conductor shall be reduced by a derating adjustment factor. Exceptions ignored. A. three, 24 B. six, 48 C. twelve, 24 D. fifteen. 48

A. three, 24 Article 310.15(3) Conductors; Adjustment Factor

High impedance grounded neutral systems in which a grounding impedence _____ ground fault current to a low value shall be permitted for 3-phase ac systems of 480 volts to 1000 volts where certain conditions are met. A. usually a resistor B. of not less greater that 10 ohms C. of not greater than 10 mA D. of not greater than 240 volts

A. usually a resistor Article 250.36 Grounding and Bonding "High impedence grounded neutral systems"

Admitting close approach; not guarded by locked doors, elevation or other effective means. A. approve B. accessible C. workable D. open

B. accessible Article 100 Definitions

Two-wire dc circuits and ac circuits of two or more _____ shall be permitted to be tapped from the ungrounded conductors of circuits having a grounded neutral conductor. Switching devices in each tapped circuit shall have a pole in each ungrounded conductor. A. grounded conductors B. ungrounded conductors C. ungrounding conductors D. grounding conductors

B. ungrounded conductors Article 215.7 Feeders Try to recognize this as "Feeder" section.

In circuits for control of irrigation and landscape lighting limited to not more than 30 volts and installed with type UF cable under minimum of 4 inch thick concrete exterior slab with no vehicular traffic and the slab extending not less than 6 inches beyond the underground installation, what is the minimum required burial depth? A. 6 B. 12 C. 18 D. 24

A. 6 Article 300.5 Table 300.5 Minimum Cover Requirements 0-600 volts

All storage or instantaneous type water heaters shall be equipped with a temperature limiting means in addition to its control thermostat to disconnect all _____. A. connected conductors B. ungrounded conductors C. water supply systems D. none of the above

B. ungrounded conductors Article 422.47 Appliances... water heater controls

Cellular Concrete Floor Raceways shall not be used in commercial garages, other than for supplying ____ outlets or extensions to the area below the floor but not above. A. floor B. wall C. ceiling D. roof

C. ceiling Article 374 Cellular Floor Raceways

A factory assembly of one or more insulated conductors with an integral or an overall covering of nonmetallic material suitable for direct burial in the earth. A. Type NM B. Type SE C. Type UN D. Type UF

D. Type UF Article 340 u/g feeder and branch circuit cable type UF

This Code does not cover the installation of electrical conductors, equipment and raceways; signaling and communications conductors, equipment and raceways; and optical fiber cables and raceways for ____. A. Insallations of conductors and equipment that connect to the supply of electricity B. Yards, lots, parking lots, carnivals and industrial substations C. Installations of communication equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations D. Public and private premises including buildings, structures, mobile homes, recreational vehicles and floating buildings.

C. Installations of communication equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations See Article 90 Introduction

Conductors of branch circuits supplying more than one receptacle for ____ loads shall have an ampacity of not less than the rating of the branch circuit. A. permanent B. most C. cord-and-plud connected portable D. washing machine

C. cord-and-plud connected portable Article 210.19(A)(2) Branch Circuits branch circuits with more than one receptacle

A raceway of circular cross section made of helically wound, formed, interlocked metal strip. A. electrical metallic tubing EMT B. rigid metal conduit RMC C. flexible metal conduit FMC D. rigid non-metallic conduit RNC

C. flexible metal conduit FMC See Article 348 (FMC)

A concrete encased electrode shall consist of at least 6.0 m (20 ft) of either (1) or (2): (1) one ore more bare zinc galvanized or other electrically conductive coated steel reinforcing bars or rods not less than 13 mm (1/2 in.) in diameter, installed in one continuous _____ foot length, or if in multiple pieces connected together by the usual steel wires, exothermic welding, welding or other effective means to create a 6.0 m (20 ft) or greater length; or (2) bare copper conductor not smaller than 4 AWG metallic components shall be encased by a least ___ inches of concrete and shall be located horizontally within that portion of a concrete foundation or footing that is in direct contact with the earth or within verticle foundations or structural components or members that are in direct contact with the earth. If multiple concrete encased electrodes are present in the building structure it shall be permissible to bond only one into the grounding electrode system A. 2, 16 B. 3, 20 C. 4, 20 D. 20, 2

D. 20, 2 See Article 250.52 Grounding and Bonding

Ground Fault Circuit Interrupter (GFCI) A. a system or circuit conductor that is intentionally grounded. B. an unitentional electrically conducting connectionbetween an ungrounded conductorof an electrical circuitand the normally non-current carrying conductors, metallic enclosures, metallic raceways, metallic equipment or earth C. all circuit conductors between the service equipment, the source of a sepatately derived system, or other power supplysource and the final branch circuit overcurrent device. D. A device intended for the protection of personnel that functions to deenergize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A service.

D. A device intended for the protection of personnel that functions to deenergize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A service. See Article 100 Definitions

It shall be permissible to calculate the load of a feeder or service that supplies three or more dwelling units of a multifamily dwelling in accordance with Table 220.84 instead of Part III of this article if all the following conditions are met A. each dwelling is equipped with electric resistance heating systems B. no dwelling unit is supplied by more than one feeder C. each dwelling unit is equipped with electric cooking equipment D. B and C

D. B and C Article 220.84 Calculations, Multi family dwelling calculations

Conduits or raceways through which moisture may contact live parts shall be _____. A. RMC B. RMC or RNC C. EMT, RMC, oe RNC D. sealed or plugged at either or both ends

D. sealed or plugged at either or both ends Article 300.5(G) Wiring Methods