105 True/False questions
The paralleled conductors in each phase, polarity, neutral, grounded circuit conductor, or equipment grounding conductor shall comply with the following:
a. (1)Be the same length (2)Have the same conductor material(3)Be the same size in circular mil area (4)Have the same insulation type (5)Be terminated in the same manner.
b. (1)Be the same length (2)Have the same conductor material (3)Be the same size in circular mil area (4)Have the same insulation type
c. (1)Be the same length (2)Have the same conductor material (3)Be the same size in circular mil area
d. (1)Be the same length (2)Be the same size in circular mil area (3)Have the same insulation type.
Article 310.4(B) in 2008, Article 310.10(H)(2)(1-5)in 2011 Conductors for General Wiring, Conductors in Parallel, conductor characteristics pg. 149 → (1)Be the same length (2)Have the same conductor material (3)Be the same size in circular mil area (4)Have the same insulation type (5)Be terminated in the same manner.
_________transformer secondary conductors shall not be considered to be protected by the primary over current protective device.
a. single-phase and multiphase
b. single-phase(other than 2 wire) and multiphase(other than delta-delta, 3 wire)
Article 240.4(F)Over current Protection, Transformer Secondary Conductors pg. 90 → single-phase(other than 2 wire) and multiphase(other than delta-delta, 3 wire)
In vaults, all voltages, where there is a manhole opening for personnel, it shall be __________________________
a. 24 inches or more for round openings
b. under 100 pounds
c. free of protrusions that could injure personnel or prevent ready egress
d. a and b
Article 110.75(B)Requirements for electrical installations Obstructions,Access to Manholes pg. 45 → free of protrusions that could injure personnel or prevent ready egress
An attachment plug and receptacle shall be permitted to serve as the disconnecting means for a single phase room air conditioner rated at 250 volts or less if ______.
a. the manual controls on the room air conditioner are readily accessible and located within 6 feet of the floor
b. it is within sight and within 6 feet
c. an approved manually operable disconnecting means is installed in a readily accessible location within sight from the room air conditioner
d. a or c
Article 440.63 Disconnecting means pg. 346 → 8 feet
Branch circuits that supply emergency lighting shall be installed to provide service from a source complying with 700.12 when the normal supply for lighting is interrupted. Such installations shall provide either of the following ______
a. a minimum of 90 minutes of emergency power
b. An emergency lighting supply, independent of the general lighting supply, with provisions for automatically transferring the emergency lights upon the event of failure of the general lighting supply system supply.
c. Two or more separate and complete systems with independent power supply, each system providing sufficient current for emergency lighting purposes
d. b and c
Article 700.17 Emergency Systems for lighting and Power, Branch Circuits pg. 626 → b and c
A unit load of not less than ______________for Hospitals shall constitute the minimum lighting load.
a. 2 volt amperes per square foot
b. 3 volt amperes per square foot
c. 1500 volt amps
d. 1920 watts
Table 220.12 Branch Circuit, Feeder and Service Calculations, General Lighting Loads by Occupancy pg. 63 → 2 volt amperes per square foot
The disconnecting means for electrified truck parking spaces intended to supply transport refrigerated units shall be readily accessible, located not more than ____ from the receptacle it controls, and located in the supply circuit ahead of the receptacle
a. 3 feet
b. 30 inches
c. 6 feet
d. 24 inches
Article Article 626.31(B) Electrified Vehicle Parking Spaces, Disconnect Location pg. 551 → 30 inches
The equipment grounding terminal buses of the normal and essential branch circuit panel boards serving the same individual patient care vicinity shall be connected together with an insulated _______
a. conductor not smaller than 10 AWG
b. continuous conductor not smaller than 10 AWG
c. conductor not smaller than 12 AWG
d. continuous copper conductor not smaller than 10 AWG
Article 517.14 Panelboard Bonding pg. 443 → 100 volts / insulated copper equipment grounding conductor
The size of the grounding electrode conductor at the service of a grounded ac system, where the largest ungrounded service entrance conductor is 600 kcmil is ___aluminum or copper clad aluminum.
Article 250.66 and Table 250.66 Grounding and Bonding , Size of Grounding electrode Conductor for AC systems pg. 115 → 3/0
Equipment listed and marked in accordance with 505.9(C)(2) for use in Class I , Zone 0,1, or 2 locations shall be permitted in ______ for the same gas and with a suitable temperature class.
a. Class II Division 2 locations
b. Class I Division 1 locations
c. Class I Division 2 locations
d. Class II Division 1 locations
Article 501.5 Zone Equipment pg. 376 → 30 amperes
Where the grounding electrode conductor is connected to a plate electrode, that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than _______ copper or _______aluminum.
a. 3/0 AWG and 259 kcmil
b. 6 AWG and 4 AWG
c. 2/0 AWG and 4/0 AWG
d. 8 AWG and 6 AWG
Article 250.66(A) Grounding and bonding, Connections to Rod, Pipe, or Plate electrodes pg. 115 → 6 AWG and 4 AWG
The minimum size copper equipment grounding conductor for a 100 amp over current device for a circuit supplying an individual piece of equipment is _____.
a. 2 AWG
b. 4 AWG
c. 6 AWG
d. 8 AWG
Article 250.122 and Table 250.122 Size of Equipment Grounding Conductors, pg. 124-125 → 3/0
Where plugging boxes are used on a stage or set each receptacle of dc plugging boxes shall be rated at not less than _____.
a. 15 amperes
b. 20 amperes
c. 30 amperes
d. 50 amperes
Article 530.14 Plugging Boxes pg. 473 → 100 volts / insulated copper equipment grounding conductor
A single electrode consisting of a rod, that does not have a resistance to ground of _______ or less shall be augmented by one additional electrode. Where multiple rod electrodes are installed to meet the requirements they shall not be _________.
a. 5 ohms and less than 25 feet
b. 25 ohms and not less than 6 feet apart
c. 25 ohms and not greater than 6 feet apart
d. 12.5 ohms and greater than 50 feet
Article 250.53(A)(2)(3)Grounding and Bonding, Supplemental Electrode Required, Supplemental Electrode required pg. 112 → 25 ohms and not less than 6 feet apart
In patient care areas the grounding terminals of all receptacles and all non-current carrying conductive surfaces of fixed electrical equipment likely to become energized that are subject to personal contact, operating at over _____, shall be connected to an _____.
a. 50 volts / bare copper equipment grounding conductor
b. 100 volts / insulated copper equipment grounding conductor
c. 30 volts / insulated copper equipment grounding conductor
d. 100 volts / insulated equipment grounding conductor
Article 517.13(B)(1)(3) Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas pg. 443 → 30 amperes
Surge Arrestor Selection shall comply with:
a. The rating shall be equal to or greater than the maximum continuous operating voltage of the phase to ground voltage of a solidly grounded system.
b. The rating shall be equal to or greater than the maximum continuous operating voltage of the phase to phase voltage of an Impedance or Ungrounded System
c. The rating of Silicon Carbide Type Surge Arrestor shall not be less than 125 percent of the maximum continuous operating voltage available at the point of application.
d.all or the above♦
Article 280.4(A)(1)(2) and (B)Surge Arresters, over 1kv Surge Arrester selection, pg. 132 → b and c
Where over-sized, concentric or eccentric knockouts are not encountered, Type RTRC (Reinforced Thermo-setting Resin Conduit) shall be permitted to be unsupported where the raceway is not more than ____ and remains _____. Such raceways shall terminate in an outlet box, device box, cabinet, or other termination at each end of the raceway.
a. 36 inches / unbroken lengths(without coupling)
b. 18 inches / unbroken lengths (without coupling)
c. 48 inches / unbroken lengths (without coupling)
d. 18 inches / unbroken lengths(with coupling)
Article 355.30(C) → 18 inches / unbroken lengths(without coupling)
External surfaces of pipeline and vessel heating equipment that operate at temperatures exceeding ____shall be physically guarded, isolated, or thermally insulated to protect against contact by personnel in the area.
a. 60 degrees C
b. 30 degrees C
c. 75 degrees C
d. 90 degrees C
Article 427.12 Thermal protection pg. 308 → simultaneous / ungrounded conductors
Metal or nonmetallic raceways, cable armors, and cable sheath shall be continuous between _______.
b. boxes and fittings
c. other enclosures or outlets
d. a, b, and c
Article 300-12 Mechanical Continuity - Raceways and Cables pg. 141 → 1/8 inch
Where the dc system source is located on the premises, a grounding connection can be made at one of the following:
a. The source
b. The first system disconnection means or over current device
c. By other means that accomplish equivalent system protection and that utilize equipment listed and identified for the use.
d. a, b, or c
Article 250.164(B) Direct Current systems, On Premises Source, pg. 128 → grounding conductor shall be sized per 250.66
Where raceways are installed in wet locations above grade, the _____ raceways shall be considered to be a wet location
a. interior of these
b. interior of metal
c. interior of non-ferrous
d. interior of non-metallic
Article 300.9 Wiring Methods, Raceways in wet locations, above-grade pg. 140 → 180 feet
In Class II, Division 1 location surge arrestors and surge-protective devices shall be ______
a. specific duty
b. designed for the purpose
c. classified as a Class II, Division 1 device
d. in suitable enclosures
Article 502.35 Surge Protection, Class II Divisions 1 & 2 pg. 388 → in suitable enclosures
No conductor shall be used in such a manner that its ______ that designated for the type of insulated conductor involved.
a. ambient temperature exceeds
b. operating temperature exceeds
c. insulation rating exceeds
d. dielectric rating exceeds
Article 310.15(A)(3) Temperature limitation of conductors pg. 149 → lockable in the open position / The driving means for the generator can be readily shut down / The generator is not arranged to operate in parallel with another generator or source of voltage.
All branch circuits serving patient care areas shall be provided with _____ by installation in _____
a. an effective ground fault current path / metal raceway system, or a cable having a metallic armor or sheath assembly.
b. an effective isolated ground fault path / non-metallic raceway system, or a cable having a non-metallic armor or sheath assembly.
c. a ground fault current path / metal raceway system, or a cable having a sheath assembly
d. an effective ground path / raceway system, or a cable having an armor or sheath assembly.
Article 517.13(A) Health Care Facilities Wiring Methods pg. 443 → an effective ground fault current path / metal raceway system, or a cable having a metallic armor or sheath assembly
Copper-Clad Aluminum conductors, 2/0 AWG through 4/0, in vertical raceways, shall be supported if the vertical rise exceeds, _____.
a. 100 feet
b. 180 feet
c. 200 feet
d. 135 feet
Article 300.19(A) and Table 300.19(A) Spacing intervals - Maximum pg. 143 → 180 feet
Manhole openings shall be free of protrusions that could injure personnel or prevent _________
b. ready access
c. entrance to and egress from
d. ready egress
Article 110.75(B)Requirements for electrical installations Obstructions,Access to Manholes Obstructions pg. 45 → ready egress
Where an AC system operating at less than ______volts is grounded at any point, the ___________shall be run to each service disconnecting means and shall be run to each disconnecting means__________________________.
a. 1000, grounded conductors, grounded conductors terminal or bus
b. 600 grounding conductors, grounding conductors terminal or bus
c. 600 grounded conductors, grounded conductors terminal or bus
d. 1000 grounding conductors, grounding conductors terminal or bus
Article 250.24(C)Grounding and Bonding Grounding Service - Supplied Alternating Current Systems, Grounded conductor brought to service equipment pg. 105 → a, b, or c
Non Combustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than _____ at the edge of the cabinet or cutout box employing a flush type cover.
a. 1/8 inch
b. 1/4 inch
c. 1/16 inch
d. 3/8 inch
Article 312.4 wiring methods and materials, pg. 174 → operating temperature exceeds
Direct buried network-powered broadband communication cables shall have a minimum depth of _____ under a driveway for a single family dwelling.
a. 18 inches
b. 6 inches
c. 0 inches
d. 12 inches
Article 830.47 and Table 830.47 Network Powered Broadband & Communications Systems, Minimum Cover Requirements pg. 699 → 12 times
The walls and roofs of transformer vaults shall be constructed of materials that have adequate structural strength for the conditions with a minimum fire resistance of ___ hours, and the floors of vaults in contact with the earth shall be concrete that is not less than ____ inches thick.
a. 3 and 4
b. 2 and 12
c. 4 and 6
d. 2 and 6
Article 450.42 Walls, Roofs and Floors pg. 354 → load side of the first over current device
In a Class I, Division 1 and 2 the cross sectional area of the conductors permitted in a seal shall not exceed ____ percent of the cross sectional area of a rigid metal conduit of the same trade size.
Article 501.15(C)(6) Conductor Fill, pg. 379 → 25
Individual partitions or groups of interconnected individual partitions shall not contain more than ______ 15 ampere, 125 volt receptacle outlets.
Article 605.8(C)Office Furnishings , Receptacle Outlets, Maximum pg. 527 → 14 AWG
Type LFMC (Liquid Tight Flexible Metal Conduit)shall be securely fastened in place by an approved means within ____ of each box, cabinet, conduit body, or other conduit termination and shall be supported and secured at intervals not to exceed _____.
a. 36 inches / 8 feet
b. 18 inches / 6 feet
c. 6 inches / 4 feet 6 inches
d. 12 inches / 4 feet 6 inches
Article 350.30(A)Liquid Tight Flexible Metal conduit Type LFMC, Securely Fastened pg 208 → 12 inches / 4 feet 6 inches
Where there are two to six disconnects as permitted in 225.33 they shall be ___________, and ____________ to indicate load served.
a. identified and labeled
b. grouped and labeled
c. separated by at least two inches and identified
d. none of these.
Article 225.34(A)Outside Branch circuits and Feeders, Grouping of disconnects pg. 75 → 6 AWG and 4 AWG
In an existing dwelling unit where additional air conditioning equipment or electric space heating equipment is not to be installed the first ________________of the load at ______________, and the remainder of the load at _______________shall be used for existing and new loads.
a. 12KVA, 80 percent and 50 percent
b. 8KVA, 80 percent and 50 percent
c. 11KVA, 100 percent and 40 percent
d. 8KVA, 100 percent and 40 percent
Article 220.83(A)Existing Dwelling Unit Load, Where Additional Air-conditioning equipment or electric space-heating equipment is not to be installed. pg. 68 → air flow can be reversed
Over current protection for feeders and branch circuits supplying electric vehicle supply equipment shall be sized for _______ and shall have a rating of not less than____ of the maximum load of the electric vehicle supply equipment
a. continuous duty / 125 percent
b. non-continuous duty / 80 percent
c. the continuous and sum of non-continuous duty loads / 125 percent
d. continuous duty / 80 percent
Article 625.21 Electric Vehicle Charging System, Overcurrent Protection pg. 545 → continuous duty / 125 percent
In a Panelboard ______ shall not be connected to a terminal bar provided for ______.
a. equipment grounding conductors / grounded conductors
b. isolated equipment grounding conductors / isolated grounded conductors
c. equipment grounding conductors / neutral conductors
d. a and c
Article 408.4 Grounding of Panel Boards pg. 276 → a, b, and c
Wiring from an emergency source or emergency source distribution overcurrent protection to emergency loads shall kept entirely independent of all other wiring and equipment, unless otherwise permitted in the following:
a. Wiring from the normal power source located in transfer equipment enclosures
b. Wiring from two sources in a common junction box, attached to exit or emergency luminaires
c. Wiring within a common junction box attached to unit equipment, containing only the branch circuit supplying the unit equipment and the emergency circuit supplied by the unit equipment
d. a, b, and c
Article 700.10(B)Emergency Systems, Circuit Wiring pg. 623 → a, b, and c
_____raceways shall not be used for branch circuits that supply patient care areas.
a. Schedule 40 PVC
b. Schedule 80 PVC
d. a, and b
Article 517.30(C)(3)(1)(2)Essential electrical systems for Hospitals, wiring requirements, mechanical protection of the emergency system pg. 447 → a, and b
Luminaires designed for end to end connection form a continuous assembly, or luminaires connected together by recognized wiring methods, shall be permitted to contain the conductors of a _____, or _____, supplying the connected luminaires and need not be listed as a raceway.
a. 3 wire branch circuit, or one 4 wire branch circuit
b. 2 wire branch circuit, or one multiwire branch circuit
c. 2 wire branch circuit, or one 4 wire branch circuit
d. one dedicated branch circuit, or two dedicated branch circuits.
Article 210.64(C)Luminaires Connected Together pg. 285 → 2 wire branch circuit, or one multiwire branch circuit
A sealed battery is one that has _______.
a. lead acid or alkali type cells
b. no provisions for the addition of water or electrolyte
c. provisions for the addition of water or electrolyte
d. one or more rechargeable cells
Article 480.2 definition, sealed cell or battery, pg. 359 → no provisions for the addition of water or electrolyte
In damp or web locations, surface-type enclosures shall be placed or equipped so as to prevent ____ from entering and accumulating within the cabinet or cutout box, and shall be mounted so there is at least _____ airspace between the enclosure and the wall or other supporting surface.
a. moisture / 3/8 inch
b. water 1/2 inch
c. moisture or water / 1/4 inch
d. rain / 1/4 inch
Article 312.2 Damp or Wet Locations pg. 174 → drip proof, weatherproof, or submersible
Electrified truck parking spaces intended to supply transport refrigerated units shall be supplied from ____ or ____ branch circuits and with an equipment grounding conductor in accordance with 250.118.
a. 208 volt, 1 phase / 277 volt, 1 phase
b. 208 volt, 3 phase / 480 volt, 3 phase
c. 120 volt, 1 phase / 240 volt, 1 phase
d. 220 volt, 3 phase / 440 volt, 3 phase
Article 626.30(A) Electrified Vehicle Parking Spaces, Branch Circuits pg. 551 → 60 ampere
Communications wires and cables shall have a vertical clearance of not less than _____ from all points of roofs above which they pass.
a. 12 feet
b. 18 feet
c. 10 feet
d. 8 feet
Article 800.44(B) Communications Circuits Wires & Cables, Outside and entering Buildings, Above Roofs pg. 671 → 1/4
An insulated grounded conductor of _____ or smaller shall be identified by continuous white or gray outer finish or by three continuous white stripes on other than green insulation along its entire length.
a. 12 AWG
b. 6 AWG
c. 8 AWG
d. 10 AWG
Article 200.6(A) Means of Identifying Grounded Conductors pg. 46 → 6 AWG
All fixed outdoor de-icing and snow melting equipment shall be provided with a means for ____ disconnection from all _____.
a. equipment / conductors
b. timed / conductors
automatic / ungrounded conductors
d. simultaneous / ungrounded conductors
Article 426.50(A) Control and Protection, disconnection pg. 307 → simultaneous / ungrounded conductors
A ground ring encircling a building or structure, in direct contact with the earth, consisting of at least _____ of bare copper conductor smaller than _____.
a. 20 feet and 2 AWG
b. 25 feet and 1/0 AWG
c. 50 feet and 2/0 AWG
d. 150 feet and 2 AWG
Article 250.52(A)(4)Ground Ring pg. 112 → 20 feet and 2 AWG
Control voltage for permanent amusement attractions shall be a maximum of _____, nominal, ac to ground or ______ dc to ground.
a. 150 volts / 300 volts
b. 125 volts / 250 volts
c. 120 volts / 125 volts
d. 50 volts / 30 volts
Article 522.5 Voltage Limitations pg. 468 → each ungrounded conductor
Industrial control panels have an assembly of two or more components consisting of ______.
a. Power circuit components only, such as motor controllers, overload relays fused disconnect switches, and circuit breakers
b. Control Circuit components only, such as pushbuttons, pilot lights, selector switches, control relays
c. A combination of power and control circuit components
d. Any of the above
Article 409.2 (1)(2)(3) Definitions, Industrial Control Panel pg. 278 → Any of the above
A 15 or 20 ampere branch circuit shall be permitted to supply lighting units or other utilization equipment, or a combination of both. The exception for a dwelling unit shall require ________ be supplied as specified.
a. small appliance branch circuits
b. laundry branch circuits
c. bathroom branch circuits
d. a, b, and c
Article 210.23(A)Permissible Loads, 15 and 20 ampere branch circuits pg. 54 → a or c
Where used at a point on a circuit, a surge arrester shall be connected to _________.
a. each grounded conductor
b. each ungrounded conductor
c. one ungrounded conductor
d. one grounded conductor
Article 280.3 Surge Arresters, over 1kv Number Required. pg. 131 → 1/4
Working space for equipment operating at 600 volts, nominal or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized shall comply with _____ or as required or permitted elsewhere in this Code.
a. 110..34(A) and Table 110.34(A)
b. 110.26(A)(1),(A)(2), and (A)(3)
c. 110.31 and Table 110.31
d. 110.34(E) and Table 110.34(E)
Requirements for Electrical Installations, Working Space pg. 38 → 110.26(A)(1),(A)(2), and (A)(3)
The depth of the working space that has a nominal voltage of 277 volts and the exposed live parts on both sides of the working space shall have a minimum clear distance of _______.
a. 3 feet
b. 3 feet 6 inches
c. 4 feet
d. 5 feet
Article 110.26(A)(1) and Table 110.26(A)(1)Requirements for Electrical Installations, Working Space pg. 38 → 4 feet
The operating grounding conductor for transmitting stations shall not be less than _____ copper or its equivalent.
a. 10 AWG
b. 12 AWG
c. 14 AWG
d. 8 AWG
Article 810.58(C) Radio and Television Equipment, Size of Operating Bonding Conductor or Grounding Electrode Conductor pg. 685 → 1/4
A fixed storage type water heater that has a capacity of ____ or less shall be considered a continuous load for the purposes of sizing branch circuits.
a. 120 gallons
b. 80 gallons
c. 40 gallons
d. 30 gallons
Article 422.13 Storage-Type Water Heaters pg. 292 → 120 gallons
Audio system equipment supplied by branch circuit power shall not be placed laterally within _____ of the inside wall of a pool, spa, hot tub, or fountain, or within _____ of the prevailing or tidal high water mark.
a. 5 feet / 20 feet
b. 12 feet / 50 feet
c. 10 feet / 25 feet
d. 5 feet / 5 feet
Article 640.10(A) Audio Signal Processing, Amplification, Reproduction Equipment, Equipment supplied by Branch-circuit Power pg. 557 → a, and b
The voltage drop, for sensitive electronic equipment, on any branch circuit shall not exceed _____. The combined voltage drop of feeder and branch circuit conductors shall not exceed _____.
a. 3 percent / 5 percent
b. 1.5 percent / 2.5 percent
c. 5 percent / 10 percent
d. 1 percent / 2 percent
Article 647.4(D) Sensitive Electronic Equipment, Voltage Drop → sign / type and location
Type TC (tray cable) cables with metallic shielding shall have a minimum bending radius of not less than ______ the cable overall diameter.
a. 4 times
b. 5 times
c. 6 times
d. 12 times
Article 336.24 Bending Radius pg. 199 → any of the above
A boiler employing resistant type immersion heating elements contained in an _____ shall have the heating elements protected at not more than _____.
a. stamped vessel / 100 amperes
ASME rated vessel / 150 amperes
c. ASME rated and stamped vessel / 150 amperes
d. rated and stamped vessel / 125 amperes
Article 424.72(A)Over current protection pg. 301 → ASME rated and stamped vessel / 150 ampere
When there are additional service disconnecting means for fire pumps, as permitted in 230.2, it shall be installed ______________from the one to six service disconnecting means for normal service to minimize the possibility of simultaneous interruption of supply
c. next to
d. none of these
Article 230.72 (B)Service Equipment - Disconnecting Means, Grouping of disconnects pg. 85 → remote
Generators shall be equipped with disconnect(s), _____by means of which the generator and all protective devices and control apparatus are able to be disconnected entirely from the circuits supplied by the generator except where the following conditions apply:________
a. lockable in the open position
b. lockable in the open position / The driving means for the generator can be readily shut down / The generator is not arranged to operate in parallel with another generator or source of voltage
c. The generator is not arranged to operate in parallel with another source of voltage
d. a, and c
Article 445.18(1)(2)Disconnecting means required for generators pg. 347 → remote
Cable trays shall not have ______ that could damage the insulation or jackets of the wiring.
a. sharp edges
d.All of the above
Article 392.100(B)Construction Specifications, Smooth Edges pg. 246 → ready egress
Conductors for branch circuits as defined in Article 100, sized to prevent voltage drop exceeding _____at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and where the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed ________.
a. 5 percent / 3 percent
b. 3 percent / 5 percent
c. 1.5 percent / 3 percent
d. 5 percent / 10 percent
Article 210.19(A) (1) FPN No. 4 and 215.2(A)(4) FPN No. 2 pg. Minimum ampacity and size pg. 53 → 22 Degrees Centigrade
In a Class I, Division 2 location surge arrestors and surge protective devices shall be non-arcing, such as metal-oxide varistor (MOV)sealed type, and surge-protective capacitors shall be of a type designed for ________.
a. Class I, Division 2 locations
b. specific duty
c. hazardous locations
d. 600 volts or less
Article 501.35(B)Surge Protection, Class I Division 2 pg. 381 → specific duty
Seals in a Class I, Zone 0 location shall not be required to be ____ or ____ devices.
a. cast aluminum / cast steel
b. explosion proof / flameproof
c. Class I, Zone 0 / Class I, Zone 1
d. a and c
Article 505.16(A)(3) Class I Zone 0 Conduit Seals pg. 407 → explosion proof / flameproof
The frame of a vehicle shall not be required to be connected to a grounding electrode as defined in 250.52 for a system supplied by a generator located on this vehicle under the following conditions:
a. The frame of the generator is bonded to the vehicle frame
b. The generator supplies only equipment located on the vehicle or cord and plug connected equipment through receptacles mounted on the vehicle
c. The normally non-current-carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are connected to the generator frame
d. a, b, and c
Article 250.34(B)(1)(2)(3)Grounding and Bonding, Vehicle mounted Generators, pg. 110 → a, b, and c
The area in a closet, where there is access to only one side of a hanging rod, that cannot contain a luminaire has a volume bounded by the sides and back closet walls and planes extending from the closet floor vertically to a height of _____ or to the highest clothes hanging rod and parallel to the walls of a horizontal distance of ____ from the sides and back of the closet walls, respectively, and continuing vertically to the closet ceiling parallel to the walls at a horizontal distance of ____ or the width of the shelf, whichever is greater.
a. 3 feet / 30 inches / 18 inches
b. 6 feet / 30 inches / 12 inches
c. 6 feet / 12 inches / 6 inches
d. 6 feet / 24 inches / 12 inches
Article 410.2 Definitions, Closet Storage space → free of protrusions that could injure personnel or prevent ready egress
Where connected to a pipe electrode, that portion of the grounding electrode conductor, for a 3 wire direct current system, that is the sole connection to the grounding electrode shall not be required to be larger than _____ copper wire or ____ aluminum wire.
a. 6 AWG and 4 AWG
b. 3/0 AWG and 250 kcmil
c. 4 AWG and 2 AWG
d. 4/0 AWG and 500 kcmil
Article 250.166(C)Size of direct current grounding electrode Connected to Rod, Pipe, or Plate Electrodes pg. 128 → 6 AWG and 4 AWG
Where more than one separately derived system is installed, it shall be permissible to connect a tap from each separately derived system to a common grounding electrode. All tap connections to the common grounding electrode conductor shall be made at an accessible location by _________________
a. a listed connector
b. the exothermic welding process
c. listed connections to aluminum or copper busbars not less than 1/4 inch by 2 inches
d. a, b and c
Article 250.30(A)(6)(c)(2)(3) Grounding Electrode Conductor, Multiple separately derived Systems. connections, pg. 108 → a, b and c
Where cord and plug connected electrical vehicle supply equipment is used, the interrupting device of a listed personnel protection system shall be provided and shall be an integral part of the attachment plug or shall be located in the power supply cable not more than ____ from the attachment plug.
a. 10 feet
b. 5 feet
c. 18 inches
d. 12 inches
Article 625.22 Electric Vehicle Charging System, Personnel Protection System pg. 545 → 12 inches
The insulation of conductors for electric welders intended for use in the secondary circuit shall be ______.
b. flame retardant
c. rated at the primary current in kVA
d. Type STOW
Article 630.41 Electric welders, Welding Cable, Conductors pg. 554 → air flow can be reversed
IN each conduit run leaving a Class I , Division 1 location the sealing fitting shall be permitted on either side of the boundary of such location within ____ feet of the boundary and shall be designed and installed so as to minimize the amount of gas or vapor within the Division I portion of the conduit from being communicated to the conduit beyond the seal
Article 501.15(A)(4) Class I, Division 1 Boundary pg. 378 → specific duty
The supply to a portable switchboard for stages shall be by means of listed ______.
a. extra-hard usage cords or cables
b. for theaters or similar locations
c. hard usage cords or cables
d. Type SJEOOW cord
Article 520.53(H) (1)Portable Switchboards on Stage, Supply Conductors pg. 464 → extra-hard usage cords or cables
Resistance type heating elements in fixed electric space heating equipment shall be protected at not more than _____.
a. 20 ampere
b. 50 ampere
c. 60 ampere
d. 100 amperes
Article 424.22(B) Over current protection Resistance Elements pg. 297 → 60 ampere
Coaxial cables shall have a vertical clearance of not less than _____ from all points of roofs above which they pass.
a. 8 feet
b. 4 feet
c. 12 feet
d. 10 feet
Article 820.44(B) Community Antenna Television & Radio Distribution Systems, Coaxial Cables Outside and entering Buildings, Above Roofs pg. 687 → sign / type and location
For equipment rated 1200 amperes or more and over 6 feet wide that contains over current devices, there shall be one entrance to and egress from the required working space not less than _________ wide and _______ high at each end of the working space
a. 24 inches 6 1/2 feet
b. 30 inches 6 feet 7 inches
c. 36 inches 6 1/2 feet
d. 30 inches 6 1/2 feet
Article 110.26(C)(2)Requirements for electrical Installations, 600 Volts or less, Entrance to and Egress From Working Space, Large equipment pg. 38 → a, b, and c
A ____ shall be placed at the service entrance equipment, indicating ____ of on site emergency sources.
a. sign / location
b. sign / type and location
c. emergency lighted sign / type
d. sign / type
Article 700.7 (A) Emergency Systems, Signs, Emergency Sources pg. 623 → sign / type and location
A ______ shall be kept on tests and maintenance for legally required standby systems
a. annual report
b. written record
c. quarterly report
d. monthly report
Article 701.3(D) Legally Required Standby Systems, Tests & Maintenance pg. 627 → written record
Enclosures for use in tunnels over 600 volts shall be _________ as required by the environmental conditions.
a. drip proof, weatherproof, or submersible
c. rain tight
d. listed for damp conditions
Article 110.59 Tunnel Installations over 600 volts nominal, enclosures pg. 44 → 1/8 inch
The use of fuses and inverse time circuit breakers with _______ampere ratings shall be permitted.
c. standard and nonstandard
d. fixed trip
Article 240.6(A)Overcurrent protection, Standard Ampere Ratings, Fuses and Fixed-trip circuit breakers pg. 91 → standard and nonstandard
The lighting unit load calculation for a warehouse shall not be less than _______ volt amperes per square foot.
Table 220.12 General lighting Loads by Occupancy pg. 63 → 14 AWG
When a ground ring is used as a grounding electrode, it shall be buried at a depth below the earth's surface of not less than _______.
a. 12 inches
b. 24 inches
c. 30 inches
d. 36 inches
Article 250.53(F)Grounding Electrode System Installation, Ground Ring pg. 113 → 30 inches
Manholes and other electrical enclosures intended for personnel entry and specifically fabricated for this purpose shall be of sufficient size to provide safe work space about electrical equipment with live parts that is likely to require _______ while energized
b. examination, adjustment, servicing, or maintenance
Article 110.70 Manholes and Other Electrical enclosures Intended for Personnel Entry, All Voltages General pg. 44 → flame retardant
Multiconductor control cables installed in ladder or ventilated trough cable tray, having a usable inside depth of 6 inches or less, the sum of the cross-sectional area of all cables at any cross section shall not exceed _____ of the interior cross-sectional area of the cable tray.
a. 80 percent
b. 40 percent
c. 50 percent
d. 75 percent
Article 392.22(A)(2)Cable Trays, Ladder or Ventilated Trough Cable Trays Containing Multi-conductor Control and/or Signal Cables Only pg. 241 → 50 percent
Type 1 SPDs (Surge Protective Device):
a. shall be permitted to be connected to the supply side of the service disconnect
b. when installed at services the grounding conductor shall be connected to one of the following:
(1)Grounded Service Conductor
(2)Grounding Electrode Conductor
(3)Grounding electrode for the service
(4)Equipment Grounding Terminal in Service Eq.
c. shall be permitted to be connected as a Type 2 SPDs
d. any of the above
Article 285.23(A)(B) and 285.24 Type I SPDs pg. 133 → single-phase(other than 2 wire) and multiphase(other than delta-delta, 3 wire)
Network-powered broadband communications systems shall be classified as having low power sources of _____ and _____ or medium power sources of _____ and _____.
a. 120 volts max / 100 VA / 240 volts / 100 VA
b. 100 volts max / 250 VA / 150 volts / 250 VA
c. 0-100 volts max / 250 VA / 0-150 volts / 250 VA
d. 500 volts max / 100 VA / 1000 volts / 200 VA
Article 830.15 and Table 830.15 Network Powered Broadband & Communications Systems Power Limitations, pg. 696 → 0 - 100 volts max / 250 VA / 0 - 150 volts / 250 VA
Where there is more than one building on the same property and under single management, and there are two to six disconnects, that are permitted per Article 225, they shall ______. Each disconnect shall be ________to indicate the load served.
a. be lockable and labeled
b. not be grouped and identified
c. be grouped and marked
d. none of these
Article 225.34(A)Outside Branch circuits and Feeders, Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit(s)Maximum Number of Disconnects, grouping of disconnects pg. 75 → be grouped and marked
General use snap switches shall be connected ______ and shall provide a means to connect metal faceplates _____ , whether or not a metal face plate is installed.
a. to a grounded conductor / to an equipment grounding conductor
b. to an equipment grounding conductor / to an equipment grounding conductor
c. to a grounded conductor / to a grounded conductor
d. to a ground / to a ground
Article 404.9(B)Provisions for general-use snap switches, Grounding pg. 268 → to an equipment grounding conductor / to an equipment grounding conductor
When a disconnect for a fire pump is installed it shall be ______from the one to six normal service disconnecting means for normal service.
c. identified separately
d. locked and remote
Article 230.72(B)Services, Additional Service Disconnecting means pg. 85 → remote
In a separately derived system a Type 2 SPDs shall be connected on the :
a. secondary side
b. line side of the first over current device
c. load side of the first over current device
d. primary side
Article 285.24(C) Type II SPDs Separately derived systems pg. 134 → load side of the first over current device
Aluminum, copper-clad aluminum, or copper conductors of size ____ and larger, comprising each phase, polarity, neutral, or grounded circuit conductor shall be permitted to be connected in parallel (electrically joined at both ends.)
a. 1 AWG
b. 2 AWG
c. 4 AWG
d. 1/0 AWG
Article 310.4(A)Conductors for General wiring, Conductors in Parallel, General pg. 148 → 1/0 AWG
Dual voltage motors that have a different locked rotor kVA per horsepower on the two voltages shall be marked with the code letter(s)_____
a. for the voltage giving the lowest locked rotor kVA per horsepower
b. for both voltages indicating the locked rotor kVA per horsepower
c. for the voltage giving the highest locked rotor kVA per horsepower
d. a, and c
Article 430.7(B)(3)Dual Voltage Motors pg. 313 → 1/8 inch
No parts of cord connected luminaires chain, cable, or cord suspended luminaires, lighting track, pendants, or ceiling suspended (paddle) fans shall be located within a zone measured ____ horizontally and _____ vertically from the top of the bathtub rim or shower stall threshold
a. 3 feet / 8 feet
b. 30 inches / 6 feet
24 inches / 8 feet
18 inches / 8 feet
Article 410.10(D)Bathtub and shower areas, pg. 281 → 50 percent
Where a grounded conductor is installed and the system bonding jumper connection is not located at the source of the separately derived system the ____________________
a. grounding conductor shall be sized per 250.66
b. grounding conductor shall be sized per 250.122
c. grounded conductor shall be routed with the derived phase conductors
d. grounded conductor shall not be routed with the derived phase conductors
Article 250.30(A)(3)(a)Grounding Separately Derived AC Systems,-Grounded Conductor-Sizing pg. 107 → 6 AWG
Transformers and capacitors that do not contain a liquid that will burn shall be installed in _____ complying with 501.100(A)(1) or be ____ for class I locations
a. hazardous locations / rated
b. locations / identified
c. vaults / identified
d. Class I, Division 1 / listed
Article 501.100(A)(2)Class I locations, Equipment, Transformers and Capacitors, Class I, Division 1, Not containing Liquid that will burn pg. 381 → vaults / identified
Where the number of current carrying conductors, in a flexible cord, exceeds three, the allowable ampacity or the ampacity of each conductor, for 7 through 9 conductors, shall be reduced to _____ from the allowable ampacity ratings in Tables 400.5(A) and 400.5(B)
a. 80 percent
b. 70 percent
c. 50 percent
d. 45 percent
in 2011 Table 400.5(A)(3)Adjustment factors for more than three current-carrying conductors in a flexible cord or cable pg. 259 → 70 percent
In tunnel installations over 600 volts the electrical controls for the ventilation system shall be arranged so that the _________ a. air flow can be shut off
b. air flow can be turned on
c. a and d
d. air flow can be reversed.
Article 110.57 Tunnel Installations over 600 Volts nominal, Ventilation system controls pg. 44 → air flow can be reversed
The use of a multioutlet assembly shall be permitted in _______
a. dry locations
b. damp or dry locations
c. where the voltage is 300 volts or more between conductors
Article 380.10 Multi-outlet Assemblies, Uses Permitted pg. 232 → explosion proof / flameproof
Where conductors or cables are installed in conduits exposed to direct sunlight on or above rooftops, from 1/2 inch to 3 1/2 inches, _____ shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the correction factors in Table 310.16 and Table 310.18.
a. 33 Degrees Centigrade
b. 22 Degrees Centigrade
c. 17 Degrees Centigrade
d. 14 Degrees Centigrade
Table 310.15(B)(3)(c)Ambient Temperature adjustment for circular raceways exposed to sunlight on or above rooftops. pg. 152 → 22 Degrees Centigrade
Except where protected with a continuous metallic shield that is grounded with an acceptable conductor, lead-in conductors for transmitting stations shall enter buildings by one of the following method(s):
a. Through a rigid, noncombustible, nonabsorbent insulating tube or bushing
b. Through an opening to provide for the purpose in which the entrance conductors are firmly secured so as to provide a clearance of at least 2 inches
c. Through a drilled window pane
d. All of the above.
Article 810.55 Radio and Television Equipment, Entrance to Building pg. 685 → 12 times
The grounding conductor of a surge arrestor protecting a transformer that supplies a secondary distribution system shall be interconnected by :
a. Metallic Interconnections
b. Through Spark Gap or Device
c. By Special Permission
d. any of these, depending on the circumstances
Article 280.24(A)(B)(C) Surge-Arrest er Conductors pg. 132 → any of these, depending on the circumstances
In each dwelling unit, the load shall be calculated at __________for each 2 wire small appliance branch circuit
a. 180 volt amperes
b. 1500 volt amperes
c. 1500 watts
d. 1200 volt amperes
Article 220.52(A) Branch Circuit, Feeder and Service Calculations,Small Appliance Circuit Load pg. 65 → explosion proof / flameproof
The width of a working space in front of electrical equipment shall be the _____ of the equipment or ______ whichever is greater.
a. width and 30 inches
b. width and 36 inches
c. overall dimensions of the equipment and 30 inches
d. depth of the equipment and 30 inches
Article 110.26(A)(2)Width of Working Space pg. 38 → simultaneous / ungrounded conductors
The ___________ of a grounded conductor shall not depend on a connection to a metallic enclosure, raceway, or cable armor.
Article 200.2(B)Use and Identification of Grounded Conductors pg. 46 → continuity
In dwelling units, hallways of ________________ shall have at least _______________
a. 12 feet or more in length and two receptacle outlets
b. 15 feet or more in length and one receptacle outlet
c. 25 feet or more in length and two receptacle outlets
d. 10 feet or more in length and one receptacle outlet
Article 210.52(H)Dwelling Unit Receptacle Outlets, Hallways pg. 58 → 1/4