NEC exam prep 2
In general, the minimum size aluminum feeder conductors permitted to be installed in parallel is ? .
1/0
Hallways _____ or longer in homes must have at least one receptacle outlet:
10 ft
) Functions of patient care depending on lighting and appliances of the life safety and critical branches shall be connected to the essential electrical system alternate power source so that all functions supplied by these branches are automatically restored within ? seconds.
10 seconds
) The service disconnecting switch for an installation consisting of a limited load on a single branch circuit shall have a rating of not less than ? .
15A
) A 4,160-volt feeder is to be installed in a nonmetallic conduit identified for direct burial without concrete encasement. The minimum covering for the nonmetallic conduit is ? .
18"
Over Current Protection for branch circuit containing Single non-motor operated appliance rated less than 13.3 amperes shall not exceed ___ amperes is the over-current protection of the appliance is not mentioned.
20 A
The full-load current of a 25-horsepower, 480-volt, 3-phase, squirrel cage induction motor is ? .
34A
Commercial Infrared Lamps and Industrial Heating Appliances shall have overcurrent protection which is not exceeding ___ amperes.
50A
) When a capacitor that operates at 1,000 volts or less is removed from an energized circuit, the charge on the capacitor shall be drained to?
50v or less within 1 minute
When the grounded conductor is to be spliced in a 12" x 12" junction box, there shall be at least? of free conductor left for splicing.
6"
Metal-clad cable shall be supported at intervals not to exceed?
6'
Foyers that have an area that is greater than _____ shall have a receptacle(s) located in each wall space.
60 ft2
A 3-wire, 120/240-volt, multiwire branch circuit feeds a split-wired duplex receptacle with two circuits on the same yoke. The disconnecting means is two single-pole, 20-ampere breakers with a handle tie.
acceptable
A luminaire, lighting outlets, and ceiling-suspended (paddle) fan are installed 14 feet directly above the maximum water level of a permanently installed, new outdoor swimming pool.
acceptable
An exposed installation of Type MI cable is supported with straps at five-foot intervals.
acceptable
) GFCI protection is required for which of the following 120-volt, 20-ampere receptacles installed in a one-family dwelling unit? I. All outdoor receptacles other than those for electric snow-melting or deicing, or for pipeline and vessel heating equipment II. All receptacles installed in kitchens intended to serve countertop surfaces.
both I and II
Which of the following conditions must be met before two or more 120-volt, 1-horsepower or less motors are permitted to be installed on the same 20-ampere branch circuit? I. The full-load current rating of each motor does not exceed 6 amps. II. The rating of the branch-circuit short-circuit and ground-fault protective device marked on any of the controllers is not exceeded.
both I and II
) Conductor sizes in the NEC must be expressed in the American Wire Gage (AWG) or in ?
circular mil
Informative Annexes are part of the enforceable requirements of the NEC.
false
A single throw knife switch shall not be installed in a manner that will?
tend to close the switch with gravity.
The radius of a bend in Type MI Cable with an overall diameter of one-half inch shall not be less than five times the external diameter of the cable measured ? .
to the inner edge of the bend
All metal raceways and all non-current-carrying metal parts of fixed and portable electrical equipment, regardless of voltage, installed in a motor fuel dispensing facility shall be grounded and bonded.
true
In an installation of Type NM cable, the 90°C conductor ampacity rating shall be permitted to be used for ampacity adjustment and correction calculations, provided that the final calculated ampacity does not exceed that for a 60°C rated conductor.
true
Type SE, service-entrance cable shall be permitted where the insulated conductors are used for circuit wiring and the uninsulated conductor is used only for equipment grounding purposes.
true
When an outlet, supplied through an underfloor raceway, is removed, the sections of the circuit conductors supplying the outlet shall be removed from the raceway.
true
The width of a 200-ampere safety switch rated at 600 volts is approximately 18.5 inches. It is installed in a location where the width of the working space is 20 inches and the door of the safety switch is able to open 75 degrees.
violation
In a residential occupancy where a two-conductor nonmetallic sheathed cable (Type NM) has the insulation of the white conductor permanently reidentified to indicate its use as an ungrounded conductor, the Code requires this reidentification to be marking tape or painting at its termination and at each location where the conductor is?
visible and accessible