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The maximum permissible open-circuit voltage of electric discharge lighting equipment used in a dwelling is _______ V.

1000

A metal elbow for a service raceway installed at least _______'' underground does not have to be grounded.

18 inches

The minimum area of exposed surface offered by a plate electrode shall be _______ sq ft.

2

A 15 A or 20 A receptacle can be installed on a _______ A general purpose circuit.

20

A single grounding electrode is permitted without the use of a supplemental electrode, when the resistance to ground does not exceed _______ ohms.

25

Double locknuts are permitted for bonding where rigid metal raceways in other than service runs enter a box or cabinet, if the raceway contains any wire of more than _______ V to ground.

250 [250.97 Ex.2]

Grounding electrodes of pipe or conduit shall not be smaller than _______'' trade size.

3/4

Receptacles connected to a 30 A branch circuit supplying two or more outlets shall be rated not less than _______ A.

30

Ground rods are permitted to be buried if the trench is at least _______' deep where rock bottom is encountered.

30 inches

In general, the minimum branch circuit rating to a single electric range of over 8 3/4 kVA is _______ A.

40

Rod-type grounding electrodes of zinc shall be at least _______'' in diameter, unless listed.

5/8

Unless special precautions are taken, exposed live parts operating at _______ V or more shall be guarded against accidental contact.

50 V

Wiring run above heated ceilings and within thermal insulation shall be derated on the basis of _______ *C ambient temperature.

50*C

The maximum standard ampere rating of a fuse or inverse time circuit breaker shall be considered to be _______ A

6000

The minimum size of a copper EGC required for equipment connected to a 40 A circuit is No. _______.

8

_______ _______ are permitted around service conduits entering concentric or eccentric knockouts or other impaired connections.

Bonding Jumpers

Non-current carrying metal parts of cord and plug connected equipment may be grounded by an _______ run with power supply conductors.

EGC

For a run of rigid metal raceway interrupted by an expansion joint, the sections of rigid conduit shall be bonded by an _______ jumper or other means.

Equipment Bonding

A single 15 A receptacle may be installed on an individual 20 A branch circuit. T/F

False

If the resistance of a single driven ground rod exceeds 25 ohms to ground, a supplemental electrode shall be added. T/F

True

In general, switch enclosures shall not be used for junction boxes. T/F

True

Iron wire shall not be used as an equipment bonding jumper. T/F

True

It is recommended that metal raceways of an electrical system should be bonded or properly spaced from lightning protection conductors. T/F

True

Stranded wires No. 10 and smaller may be connected to equipment by means of screws used with terminal plates having upturned lugs. T/F

True

The grounding conductor in a cable assembly for cord-and-plug-connected equipment need not be insulated. T/F

True

Heating cables on ceilings shall be kept free from contact with metal or other _______ surfaces.

electrical

Splices that will be soldered shall first be made mechanically and _______ secure.

electrically

Flexible cord shall not be used as a substitute for _______ wiring of a structure.

fixed

Ungrounded conductors shall be clearly distinguishable from _______ and grounding conductors by color or other marking.

grounded

Separately mounted ballasts that are _______ for direct connection to a wiring system shall not be required to be additionally enclosed.

listed

The _______ shall be grounded in a 1/O, 3-wire, AC system.

neutral

Leads of 240 V heating cables are marked with _______.

red

The neutral feeder conductor shall be capable of carrying the maximum _______ load.

unbalanced

If a change occurs in the size of the _______ conductor, a similar change may be made in the size of the grounded conductor.

ungrounded