When determining the spacing of receptacle outlets in a dwelling unit, a wall space is considered any space ____________ or more in width and unbroken along the floor line by doorways and similar openings, fireplaces, and fixed cabinets.

Equipment that controls dc voltage or dc current, or both, and that is used to charge a battery or other energy storage device is called a ______________.

Transformers and electronic power supplies for electric signs shall be permitted in attics provided there is an access door at least ___________ in size.

Feeder conductors supplying 6 elevators are allowed to have a demand factor of _________ applied.

Which of the following is not required to be marked on a busway nameplate?

In land areas subject to tidal fluctuation, the electrical datum plane is a horizontal plane __________ above the highest tide level for the area occurring under normal circumstances.

Nonmetallic surface extensions shall be secured in place by approved means at intervals not exceeding _________.

When a separate overload relay is used to provide overload protection for a hermetic refrigerant motor-compressor, the device shall be set to trip at not more than ___________ of the motor-compressor rated-load current.

3/0 AWG copper conductors in vertical raceways shall be supported at intervals not to exceed ____________.

The lead wire of an electric space-heating cable is identified by red markings on the nonheating lead. What is the nominal voltage of this heating cable?

Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts phase to ground but not exceeding 1,000 volts phase-to-phase for each service disconnect rated _______________ or more.

The residual voltage of a capacitor, rated over 1,000 volts, shall be reduced to 50 volts, nominal, or less within _______ after the capacitor is disconnected from the source of supply.

In which of the following electrical circuits is it prohibited from reducing the capacity of the neutral conductor?

What is the maximum setting for a nontime delay fuse used to provide branch-circuit, short-circuit, and ground-fault protection for a 3-phase, 10 hp, 230 volt wound-rotor motor?

What is the allowable ampacity of each conductor where 8 current-carrying, 1/0 AWG, RHW, copper conductors are installed in a raceway?

Multiwire branch circuits shall _______________.

What minimum size THW copper conductors are required for the 1-phase supply conductors of a phase converter that supplies variable loads if the nameplate input load is 23 amperes?

Which of the following statements is/are true regarding emergency systems?
I. Batteries for unit equipment shall have a capacity to supply and maintain the total lamp load associated with the equipment at not less than 87 ½% of the nominal battery voltage for a period of at least 1 ½ hours.
II. Branch circuits serving emergency lighting shall not be part of a multiwire branch circuit.

The overhead conductors between the utility electric supply system and the service point is referred to by the N.E.C. as the _______________.

Splices and taps within a metal wireway shall not fill the wireway to more than __________ of its area at that point.

Which of the following statements regarding manufactured wiring systems is/are true?
I. Manufactured wiring systems shall never be permitted for use in ducts or plenums.
II. Receptacles used with manufactured wiring systems shall be of the locking type.

Where nonmetallic sheathed cable is used with a nonmetallic outlet box, the sheath of the cable must extend not less than ___________ inside the box and beyond any cable clamp.

What is the total resistance of a parallel circuit containing 1 – 40 ohm resistor, 1 – 60 ohm resistor, and 1 – 80 ohm resistor? (All resistors are connected in parallel.)

Only live-line tools having a manufacturer’s certification to withstand a minimum test of ___________ per foot of length for ______________ when the tool is made of fiberglass shall be used.

Supported scaffolds with a height to base width ratio of more than ________________ shall be restrained from tipping by guying, tying, bracing, or equivalent means.