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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