electrical certification prep

New

Long-Term Learning

Learn efficiently and remember over time.

Start Long-Term Learning

Get personalized study reminders at intervals optimized for better retention.
Track your progress on this set by creating a folder
Or add to an existing folder

Add this set to a folder

  • When sizing conductors and overcurrent protection for motors, we must comply with Article _____.

    430

    (430-22)Branch circuit conductors to a single motor must have an ampacity of not less than _____ percent of the motors full load current as ed in Tables ______ .

    125, 430.238-250

    (110-14(C)(1)The actual conductor size for a motor feed must be selected from Table 310-15(A)(16) using the column that complies to the_____ of the equipment.

    Terminal temperature rating

    (Table 430-248, 430-22)What size THHN conductor is required for a 2 horsepower 230-volt, single phase motor?

    No. 14

    Motors and their associated equipment must be protected against overcurrent. Due to the special characteristics of induction motors, overcurrent protection is generally accomplished by having the overload protection separated from the _____.

    Short circuit and ground fault protection device.

    (430)Article 430 Part ____ contains the requirements for motor overload protection, and Article 430 Part ____ contains the requirements for short-circuit and ground-fault protection.

    3,4

    (430-31)Overload is the condition in which current exceeds the ______ , which can result in equipment damage due to dangerous overheating.

    Equipment ampere rating

    (430-36)If overload protection is to be accomplished by the use of fuses, a fuse must be installed to protect each ______ conductor.

    Ungrounded

    (430-51)Branch short-circuit and ground-fault protection is intended to protect the motor, the motor control apparatus, and the conductors against short circuit or ground faults, but are not intended to protect against _____.

    Overload

    Generally, the motor overload device is part of the ____, however, a separate overload device like a _______ may be used.

    Motor starter, dual element fuse

    (430-32(A)(1),430-32(C))Motors rated more than 1 horsepower without integral thermal protections, and motors 1 horsepower or less (automatically started) must have an overload device sized in response to the __________.

    Motor nameplate rating

    (430-32(1) If a dual element fuse is used for overload protection, what size fuse is required for a 5 horsepower 230 volt motor, single phase motor, service factor 1.16, if the motor nameplate current rating is 28 ampere?

    35

    (430-32(1))Motors with a nameplate temperature rise rating not over _____ C shall have the overload protection devices sized no more than _____ percent of motor nameplate rating.

    140, 25

    (430-32(1))If a dual element fuse is used for overload protection, what size fuse is required for a 50 horsepower 460 volt, 3 phase motor, temperature rise 39 C motor nameplate current rating of 60 ampere (FLA?)

    75 ampere or under (70)

    (430-32(1))Motors that do not have a service factor rating of 1.15 and up, or a temperature rise rating of 40 C or less, must have the overload protection device sized at not more than _____ percent of the motor nameplate ampere rating.

    115

    (430-52)Short circuit and ground fault protection (except torque motors) must be sized no greater than the percentages ed in Table ________

    430-52

    (430-36)If a fuse is used for overload protection on a motor, one must be installed on each _______.

    Ungrounded conductor

    (430-52(C)(1)(ex.))If a short circuit ground fault protection device value does not correspond with the standard rating or setting of overcurrent protection devices, the next ______ protection device may be used.

    Higher

    (Table 430-52)(Table 430-248-250)To determine the size of the motor branch circuit, short circuit and ground fault protection device, one should (1) Locate the motor type on Table 430-52 (2) Select the percentage according to the type of protection device.(True/False)

    True

    (Table 430-52)(Table 430-248-250)The branch-circuit short-circuit protection (non-time delay fuse) for a 3 horsepower 115 volt motor shall not exceed _____ ampere.

    110

    (Table 430-52)(Table 430-248-250)The branch-circuit short-circuit protection (dual element fuse) for a 5 horsepower Design E, 230 Volt motor, single phase, shall not exceed ______ ampere.

    50

    (Table 430-52)(Table 430-248-250)The branch-circuit short-circuit protection (inverse time breaker) for a 25 horsepower synchronous 460 volt motor, 3-phase, shall not exceed ____ ampere.

    70

    (430-22) For a 1 horsepower 120-volt motor, nameplate current rating of 14 amperes, The branch circuit conductors can be No. 14 THHN.(True/False)

    False

    (430-32(1))For a 1 horsepower 120-volt motor, nameplate current rating of 14 amperes, Overload protection is from _____ampere.

    16.1

    (Table 430-52)(Table 430-248-250)For a 1 horsepower 120-volt motor, nameplate current rating of 14 amperes, short circuit and ground fault protection is permitted to be a ______ circuit breaker.

    40 ampere

    (430-24)Feeder conductor size: Conductors that supply several motors must have an ampacity of not less than _____ percent of the highest rated motor full-load current (Table 248-250) plus the _____ of the full load currents of the other motors on the same phase.

    125, sum

    (430-24)What size feeder conductor (in ampere) is required for two motors. Motor 1) 7 ½ horsepower single phase, 230 volts (40 ampere) ; Motor 2) 5 horsepower single phase 230 volts (28 ampere) Terminals rated for 75 C.

    No. 4

    Motor feeder conductors must have protection against short-circuits and ground faults, but not ______.

    Overloads

    (430-53(C)(4))The Feeder overload protection (circuit breaker in panel) must be sized not greater than The largest branch circuit short circuit ground fault protection device of any motor in the group, plus the sum of the full load currents of the other motors(on the same time and phase).(True/False)

    True

    (Table 430-52)(Table 430-248-250)(430-53(C)(4))What size feeder protection (inverse time breaker) is required for a 5 horsepower, 230 volt, single phase motor and a 3 horsepower, 230 volt, single phase motor?

    80 amperes(next size down)

    (430-17)When selecting the feeder conductors or feeder short-circuit ground-fault protection device, the highest rated motor shall be the highest rated motor _______, not the highest rated _______.

    Full-load current, horsepower

    (Table 430-248-250) Which is the highest rated motor for the following? Motor 1) 10 horsepower, 3 phase 208 volts; 2) 5 horsepower, single-phase, 208 volts; 3) 3 horsepower, single phase, 120 volts.

    3 horsepower, single phase, 120 volts

    Motor Calculations: Should be done in the order of 1) Motor full load current; 2) Overload protection; 3) Branch circuits conductor; 4) Branch circuit protection ( next size up); 5) Feeder conductor 6) Feeder Protection ( Next size down) (True/False)

    True

    When sizing conductors and overcurrent protection for motors, you must comply with th requirements of NEC Article 430, not Article 240.(True/False)

    True

    (430-22 ) (Table 310-15(B)(16) What is the size THHN conductor required for a 5 horsepower 230-volt, single phase motor? Terminals are rated 75 C.

    No. 10

    (430-32(A)(1))Motors and their associated equipment must be protected against overcurrent (overload, short circuit or ground-fault), but because of the special characteristics of induction motors, overcurrent protection is generally accomplished by having the overload protection separate from the short-circuit and ground-fault protections.(True/False)

    True

    (Figure 430-1)Which parts of Article 430 contain the requirements for motor overcurrent protection?

    Overload protections Part III, Short-circuit ground-fault protections Part IV

    (430-31) Overload is the condition where current is greater than the equipment ampacity rating resulting in equipment damage due to dangerous overheating [Article 100] Overload protection devices, sometimes called heaters, are intended to protect the motor, motor-control equipment and branch circuit conductors from dangerous overheating.(True/False)

    True

    (430-51) The branch-circuit short-circuit and ground-fault protection device is intended to protect the motor, the motor control apparatus and the conductors against overcurrent due to _______.

    Short-circuits and ground-faults

    (430-32(A)) The NEC requires motor overload protection devices to be sized according to the motor full-load current rating as ed in Tables 430-147, 148, or 150. (True/False)

    False

    (430-32(C)) The standard size overload protection device must be sized according to the requirements of Section 430-32 of the NEC. If the overload protection relay sized according to Section 430-32 is not capable of carrying the motor starting and running current, the next size up overload can be used if sized according to the requirements of Section 430-32(C).(True/False)

    True

    (430-32(A)(1)) Motors with a nameplate service factor (SF) rating of 1.15 or more must have the overload protection device sized at no more than _____ percent of motor nameplate current rating.

    125

    (430-32(A)(1)) Motors with a nameplate temperature rise rating not over 40 degrees C must have the overload protection device sized at no more than _____ percent of motor name plate current rating.

    125

    (430-32(A)(1)) Motors that have a service factor of 1.10 must have the overload protection device sized at not more than ____ percent of the motor nameplate ampere rating.

    115

    (430-32(A)(1)) If a dual-element fuse is used for overload protection, what size fuse is required for a 5 horsepower208-volt, 3 phase motor, service factor 1.16, motor nameplate current rating of 16 ampere (FLA)?

    20 ampere

    (430-32(A)(1)) If a dual-element fuse is used for the overload protection, what size fuse is required for a 30 horsepower 460 volt 3-phase synchronous motor, temperature rise 39 C?

    40 ampere

    (Table 430-52) In addition to overload protection, each motor and its accessories requires short-circuit and ground-fault protection according to the requirements of Section 430-52. When sizing the branch circuit protection device, we must consider the motor type, such as induction, synchronous, wound-rotor, etc.; the motor Code letter starting characteristics; and the type of protection device to be used, fuse of breaker.(True/False)

    True

    (430-52(C)(1)(ex. 2)) The NEC requires motor branch circuit short-circuit and ground-fault protection to be sized not greater than the percentages ed in Table 430-52. When the short-circuit ground-fault protection device value determined from Table 430-52 does not correspond with the standard rating of overcurrent devices as ed in Section 240-6(A), the next ______ size must be used.

    Larger

    (430-52(C)(1) ) To determine the percentage of the motor FLC from Table 430-152 that is to be used to size the motor branch circuit short-circuit ground-fault protection device, a) Locate the motor type on Table 430-152, such as direct current, wound rotor, high reactance, autotransformer start, or all other motors; b) Locate the motor starting conditions, such as Code letter or no Code letter; and c) Select the percentage from Table 430-152 according to the type of protection device, such as one-time fuse, dal element fuse, or circuit breaker.(True/False)

    True

    (430-52(C)(1)(ex 2b)) If the branch circuit short-circuit ground-fault protection dual-element fuse selected (sized not greater than the percentages ed in Table 430-152) , is not capable of carrying the load, the next larger size dual element fuse can be used. The next size dual element fuse cannot exceed _____ of the motor full-load current rating.

    225 %

    (430-22 430-32 430-52) Conductors are sized at _____ percent of the motor full-load currents [Section 430-6 and 430-22], overloads from _____ percent, and the motor short-circuit ground-fault protection device (inverse time circuit breaker) is sized up to _____. (There is no relationship between the branch circuit conductor ampacity and the short-circuit ground-fault protection device!)

    125%, 115%, 250%

    (430-22, 430-32(A)(1), 430-52(C)(2)) For a 10 horsepower 208-volt, 3-phase motor, nameplate current 29 ampere, a) the branch circuit conductors can be No. 8 THHN; b) Overload protection is from 33 ampere to 38 ampere; and c) Short-circuit and ground-fault protection is an 80 ampere circuit breaker.(True/False)

    True

    (430-24) Feeder conductors that supply several motors must have an ampacity of not less than 125 percent of the highest rated motor FLC and the sum of the full load currents of the other motors on the same phase.(True/False)

    True

    (430-52(C)(1) Motor feeder conductors (sized according to 430-24) must have a feeder protection device to protect against short-circuits and ground-faults (not overloads) sized greater than the ____ branch circuit short-circuit and ground-fault protection device [Section 430-52] of any motor of the group plus the sum of full load currents of the other motors on the same______.

    Largest, phase

    (430-52(C)(1) A 30 horsepower 460 volt 3 phase synchronous motor and a 10 horsepower 460 volt 3 phase motor, on the same circuit... The 30 horsepower motor has No 8 THHN with a 80 ampere breaker, the 10 horsepower motor has a No. 14 THHN with a 35 ampere breaker, and the feeder conductors must be No. 6 THHN and be on a 90 ampere breaker (True/False).

    True

    (430-52(C)(1) When selecting the feeder conductors and short circuit ground-fault protection device, the highest rated motor shall be the highest rated ______.

    Full-load current

    (430-52(C)(1) Which is the highest rated motor of the following? A) 25 horsepower synchronous 3-phase 460 volts; b) 20 horsepower 3-phase 460 volts; c) 15 horsepower, 3-phase, 460 volts; or d)3 horsepower 120 volts?

    3 horsepower 120 volts

    (Table 430-248-250) What is the VA input of a dual voltage 5 horsepower 3-phase motor rated 460/230 volts?

    6055VA

    (Table 430-248-250) What is the input VA of a 3 horsepower 208-volt single phase motor?

    3890 VA

    (Table 430-22(e) ) The branch circuit conductors of a 5 horsepower 230 volt motor with a nameplate rating of 25 ampere shall have an ampacity of not less than _____. Note: the motor is used for intermittent duty and cannot run for more than 5 minutes at any one tie due to the nature of the apparatus it drives.

    21 amperes

    (430-32(a) (1)) The standard overload protection device for a 2 horsepower 115 volt motor that has a full-load current rating of 24 ampere, and a nameplate rating of 21.5 ampere shall not exceed _____.

    24.7 amperes

    (430-32(c)) The maximum overload protective device relay for a 2 horsepower 115 volt motor with a nameplate rating of 22 ampere is _____ The service factor is 1.2.

    30.8 ampere

    (430-32(a)(2) The ultimate trip overload device of a thermally protected 1 ½ horsepower 120 volt motor would be rated no more than ______.

    31.2 ampere

    (430-52 Table 430-250) A 2 horsepower 120 volt wound rotor motor requires a _____ branch circuit protection device.

    40 ampere

    (Table 430-52) The branch circuit short-circuit protection device for a 10 horsepower 230 volt single-phase wound rotor motor shall not exceed _____. Note: Use an inverse time breaker for protection.

    125 ampere

    (430-52 Table 430-152) The branch circuit protection for a 125 horsepower 240-volt direct current motor is _____.

    700 ampere

    (430-24 )One branch circuit serves 3 15 HP 208 Volt 3-phase motors, 3 3 horsepower 208 volts 1 phase motors, and 3 1 horsepower 120 volt single phase motors. This requires a No. _____ THHN for the feeder, if the motor terminals are rated for 75 C.

    4/0

    (430-62(a)) There are three motors: one 5 horsepower 230-volt motor with service factor of 1.2 and two 1 ½ horsepower 120-volt motors. The three motors are fed with a 3-wire cable. Using an inverse time breaker, the feeder conductor protection device after balancing all three motors would be _____.

    90 ampere

    (430-62(a)) If an inverse-time breaker is used for the feeder short-circuit protection, what size protection is required for the following -phase motors? 1) 40 horsepower 52 FLC; 2) 20 horsepower 27 FLC; 3) 10 horsepower, 14 FLC; 4) 5 horsepower, 7.6 FLC.

    175 ampere

    (430-62(a)) If dual-element fuses are used to protect a three-wire 110/230 volt feeder conductor for twenty two ½ horsepower single phase 115 volt motors, the fuse size selected should not be greater than ______.

    110 ampere

    (430-62(a)) The feeder protection for a 25 horsepower 208 volt 3 phase and thre 3 horsepower 120-volt motors would be _____, after balancing. Note: Use Inverse time breakers (ITB)

    225 ampere

    (314-16(B)(1) Equipment grounding conductors and not more than ____ fixture wires (smaller than No. 14 shall be permitted to be omitted from the calculations where they enter the box from a domed fixture or similar canopy.

    4

    (314-16(B)(5)) A box has three equipment grounding conductors. When determining the number of conductors in a box for box fill calculations the three grounding conductors are counted as ______ conductor(s).

    1

    (314-17) Metal plugs or plates used with nonmetallic boxes shall be recessed _____ inch.

    ¼

    (314-22(ex) Only a _____ wiring method can be used for a surface extension from a cover, and the wiring method must include an equipment grounding conductor.

    Flexible

    (314-23(D)(1)) Outlet boxes can be secured to suspended ceiling framing members by mechanical means such as bolts, screws or rivets or other means identified for the suspended ceiling framing member(s).(True/False)

    True

    (314-23(F)) Enclosures not over 100 cubic inches that have threaded entries that support lighting fixtures or contain devices shall be considered adequately supported where two or more conduits are threaded wrenchtight into the enclosure where each conduit is supported within _____ inches.

    18

    (314-24(A)) The internal depth of outlet boxes intended to enclose flush devices shall be at least _____ inch.

    ½ inch

    (370-384) Outlet boxes which support paddle fans must be ed and marked by the manufacturer as suitable for this purpose.(True/False)

    True

    (314-29) Outlet boxes, junction boxes, and pull boxes are required to be accessible.(True/False)

    True

    (314-40(C)) Metal boxes over _____ cubic inches in size shall be constructed so as to be of ample strength and rigidity.

    100

    (314-71(A)) For straight pulls, the length of the box shall be not less than ____ times the outside diameter, over sheath, of the largest conductor or cable entering the box on systems over 600 volts.

    48

    (312-2) Cabinets or cutout boxes installed in wet locations shall be _____.

    Weatherproof

    (312-5(C)) Cables entering a cutout box shall have a maximum of two cables per connector.(True/False)

    True

    (366-2) An auxiliary gutter is permitted to contain conductors or busways.(True/False)

    True

    (366-22(A)) If an auxiliary gutter contains more than ______ current carrying conductors at any cross-section, adujustment factors outlined in 310-15(B)(3)(a) apply.

    30 current-carrying

    (366-23) The continuous current-carrying capacity of 1 square inch copper busbar mounted in an unventilated enclosure is _____ amperes.

    1000

    (366-100(a)) Auxiliary gutters shall be constructed and installed to maintain mechanical and _____ continuity.

    Electrical

    (404-2(b)(ex)) Switches or circuit breakers shall not disconnect the grounded conductor of a circuit unless the switch or circuit breaker _____.

    Simultaneously disconnects all conductors of the circuit.

    (404-8) All switches and circuit breakers used as switches must be installed so that they can be operated from a readily accessible place.

    True

    (404-9(C)) A faceplate for a flush-mounted snap switch shall not be less than _____ inches thick when made of a nonferrous metal.

    .04

    (404-14(a)) Alternating current general use snap switches can control resistive loads that do not exceed the amperage and voltage rating of the switch; inductive and tungsten filament (120 volt) loads that do not exceed the ampere and voltage rating of the switch; or motor loads (2 horsepower or less) that do not exceed 80 percent of the ampere rating of the switch.(True/False)

    True

    (404-17) A fused switch shall not have fuses _____.

    In parallel

    (408-3(2)) Barriers shall be placed in all service switchboards to isolate the service _____ and terminals from the remainder of the switchboard.

    Busbars

    (408-20) Switchboards that have any exposed live parts shall be located in permanently _____ locations and then only where under competent supervision and accessible only to qualified persons.

    Dry

    (408-19)An Insulated conductor used within a switchboard shall be ed, flame retarden, and rated for the highest voltage it may contact.(True/False)

    True

    (210-5(C)) All panelboard circuit breaker _____ shall be legibly identified as to purpose or use on a circuit directory located on the face or inside of the panel doors.

    Modifications(not in 2011 code)

    (408-36(ex 2) A lighting and appliance branch circuit panelboard contains six 3-pole breakers and eight 2-pole breakers. The maximum allowable number of single-pole breakers that can be added to this panelboard is ______.

    8

    (408-40) When equipment grounding conductors are installed in panelboards, a _____ is required for the proper termination of the equipment grounding conductors.

    Grounding termination bar

    (Table 400-4) Type HPD cord is permitted for _____ usage.

    Not hard

    (400-5(A)(1)) A three conductor No. 16 SJE cable (one conductor is used for grounding) shall have a maximum ampacity of _____ amperes for each conductor.

    13

    (400-8) Flexible cords shall not be used as a substitute for _____ wiring.

    Fixed

    (400-10) Flexible cords shall be connected to devices and to fittings so that tension will not be transmitted to joints or terminal screws. This shall be accomplished by knotting the cord, winding with tape, or using fittings designed for the purpose (True/False)

    True

    (400-22) One conductor of flexible cords intended to be used as a _____ circuit conductor shall have a continuous marker readily distinguishing it from the other conductor or conductors.

    Grounded

    (402-3) The maximum operating temperature of asbestos-covered type AF heat resistant wire is _____ C.

    150 (not in 2011 code)

    (402-10) Fixture wires shall be permitted (1) for installation in lighting fixtures and in similar equipment where enclosed or protected and not subject to _____ in use, or (2) for connecting lighting fixtures to the branch circuit conductors supplying the lighting fixtures.

    Bending or twisting

    (406-9) Interior locations protected from weather but subject to moderate degrees of moisture such as some basements, some barns, some cold-storage warehouses and the like, the partially protected locations under canopies, marquees, roofed open porches and the like shall be considered to be _____ locations.

    Damp

    (410-10(D)) Not part of cord-connected lighting fixtures, hanging lighting fixtures, lighting track, pendants, or suspended ceiling fans shall be located within a zone measured 3 feet horizontally and ____ feet vertically from the top of the bathtub rim or shower stall threshold.

    8

    (410-16(B)) The NEC requires a lighting outlet in clothes closets.(True/False)

    True

    (410-16(C)(3)) In clothes closets recessed incandescent lighting fixtures with a completely enclosed lamp shall be permitted to be installed in the wall or on the ceiling, provided there is a minimum clearance of ______ inches between the fixture and the nearest point of storage space.

    6

    (410-30(A)) The maximum weight of a light fixture that may be mounted by the screw shell of a brass socket is _____ pounds.

    6

    (410-30(B)) Metal poles used for the support of lighting fixtures must be bonded to an _____.

    Equipment grounding conductor

    (410-36 314-27(A)(2)) Where the outlet box provides adequate support, a fixture weighting up to _____ pounds may be supported by the outlet box.

    50

    (410-36(G)) Trees can be used to support lighting fixtures(True/False)

    True

    (410-52) Lighting fixtures shall be wired with conductors having insulation suitable for the environmental conditions and temperature, voltage, and current to which the conductors whill be subjected.(True/False)

    True

    (410-56(D)) No _____ splices or taps shall be made within or on a fixture.

    Unnecessary

    (410-62(B)) Lighting fixtures that require adjustment or aiming can be cord-connected without an attachmet plug.

    True

    (410-64) Lighting fixtures shall not be used as a raceway for circuit conductors, except lighting fixtures designed for end to end assembly to form a continuous raceway, or lighting fixtures connected together by recognized wiring methods shall be permitted to carry through conductors of 2-wire or ______ branch circuit supplying the lighting fixtures.

    Multiwire

    (410-82(A)) Portable lamps shall be wired with _____ , recognized by Section 400-4, and have an attachment plug of the polarized or grounding type.

    Flexible cord

    (410-103) A 1000 watt incandescent lamp requires a _____ base.

    Mogul

    (406-5(A) Receptacles mounted in boxes that are set back of the wall surface shall be installed so that the mounting _____ of the receptacle is held rigidly at the surface of the wall.

    Yoke or strap

    (406-9) A receptacle shall be considered to be in a location protected fro the weather where located under roofed open porches, canopies, marquees, and the like and will not be subjected to ______.

    Beating rain or water run-off

    (406-9(2)(b)) An enclosure that is weatherproof only when the receptacle cover is closed can be used for receptacles in a wet location when the receptacle is used for portable equipment or portable tools while attended (True/False).

    True

    (406-9(E)) Grounding type attachment plugs shall be used only where an _____ ground is provided.

    Equipment

    (410-117(C)) The minimum distance an outlet box containing fixture tap supply conductors can be placed from a recessed fixture is _____ feet

    1

    (410-115(A)) Lighting fixtures shall be so constructed that adjacent combustible material will not be subjected to temperature in excess of _____ C.

    90

    (410-136(B)) Surface mounted lighting fixtures with ballast must have a minimum clearance of _____ inches from combustible low density fiberboard, unless the fixture is marked "suitable for surface mounting on Combustible low-density cellulose fiberboard."

    1 ½

    (410-140(B)) Electric discharge lighting fixtures having an open circuit voltage exceeding _____ volts shall not be installed in or on dwelling occupancies.

    1000

    (410-151(A)) Lighting track fittings shall be permitted to be equipped with general purpose receptacles.(True/False)

    False

    (410-151(C)(2)) Track lighting shall not be installed within the zone measured 3 feet horizontally and ____ vertically from the top of the bathtub rim.

    8

    (422-10(A)) Individual appliances that are continuously loaded shall have a branch circuit rating sized no less than _____percent of the appliance marked ampere rating.

    125

    (422-12) A(n) _____ branch circuit must supply central heating equipment, other than fixed electrical space heating equipment.

    Individual

    (422-16(B)(1)(2)) A disposal can be cord and plug connected. The cord must not be less than 18 iches or more than____ inches and must be protected from physical damage.

    36

    (422-18) Ceiling fans that do not exceed _____ pounds in weight, with or without accessories, must be supported by outlet boxes identified for such use and supported in accordance with Sections 370-23 and 370-27.

    35

    (422-31(B)) For permanently connected appliances rated over ____ volts, amperes, or horsepower, the branch circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or cidrcuit breaker is within sight from the appliance or is capable of being locked in the open position.

    300

    (422-46) Electrically heated smoothing irons shall be equipped with an identified _____ means.

    Temperature limiting

    (424-19) The branch cicuit conductor and overcurrent protection device for fixed electric space heating equipment loads shall not be smaller than _____ percent of the total load.

    125

    (424-13) Fixed electric space heating equipment shall be installed to provide the _____ spacing between the equipment and adjacent combustible material, unless it has been found to be acceptable where installed in direct contact with combustible material.

    Required

    (422-22(B)) Resistance type heating elements in electric space heating equipment shall be protected at not more than _____.

    60 amperes

    (424-36) Conductors located above a heated ceiling shall be considered as operating in an ambient temperature of ____ C.

    50

    (424-39) The minimum clearance between an electric space heating cable and an outlet box used for surface lighting fixtures shall not be less than _____ inches.

    8

    (424-72(A)) A boiler employing resistance-type immersion heating elements contained in an ASME rated and stamped vessel and rated more than 120 amperes shall have the heating elements subdivided into loads not exceeding ____ amperes.

    120

    (424-91) A heating panel is complete assembly provided with a junction box or a length of flexible conduit for connection to a ______.

    Branch circuit

    (426-2) Examples of snow melting resistance heaters could be tubular heaters and strip heaters, immersion heaters and heating blankets, or heating cables or heating tape.(True/False)

    True

    (426-30) Exposed elements of impedance heating systems shall be physically guarded, isolated, or thermally insulated with a _____ jacket to protect against contact by personnel in the area.

    Weatherproof

    (426-50(A)) All fixed outdoor de-icing and snow-melting equipment shall be provided with a means for disconnection from all _____ conductors.

    Ungrounded

    (427-4) The ampacity of branch circuit conductors and the rating or setting of overcurrent protective devices supplying fixed electric heating equipment for pipelines and vessels shall not be less than ______ percent of the total load of the heaters.

    125

    (430-52(1) For general motor application, the motor branch circuit short-circuit ground-fault protection device must be sized based on the _____ amperes

    NEC Table

    (430-9(B)) Conductors for motors, controllers and terminals of control circuit devices are required to be of copper wire unless identified with different conductors.

    True

    See More

    Please allow access to your computer’s microphone to use Voice Recording.

    Having trouble? Click here for help.

    We can’t access your microphone!

    Click the icon above to update your browser permissions above and try again

    Example:

    Reload the page to try again!

    Reload

    Press Cmd-0 to reset your zoom

    Press Ctrl-0 to reset your zoom

    It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

    Please upgrade Flash or install Chrome
    to use Voice Recording.

    For more help, see our troubleshooting page.

    Your microphone is muted

    For help fixing this issue, see this FAQ.

    Star this term

    You can study starred terms together

    NEW! Voice Recording

    This is a Plus feature