Chapter 7 Flashcards
AC conductors installed in metal raceways or enclosures shall be arranged to provide induction heating of the metal raceways or enclosures.
False
An example of a(n) ___ space used for environmental air is the space over a hung ceiling used for environmental air.
other
Holes that are drilled into framing members to permit the installation of raceways or cables shall be at least ___” from the nearest edge of the wood member.
1-1/4
Splices or taps are never permitted within a raceway.
false
Article 300 applies to wiring that is part of equipment.
false
___ is the shortest distance measured between a point on the top surface of any direct-buried conductor, cable, conduit, or other raceway and the top surface of finished grade, concrete, or similar cover.
Cover
Boxes or cabinets marked “___” can be installed outdoors.
rain tight, rainproof, outdoor type
The inductive heating effect of metal is minimized by cutting ___ between the holes for conductors.
slots
Seals shall be installed in spare or unused raceways and raceway systems whenever condensation is known to be a problem.
True
Under certain conditions EGCs are permitted to be run separate from their associated circuit conductors.
True
Cables and conductors installed on the side of a pole or building shall be protected up to ___’ above finished grade.
none of the above
Under certain conditions conductors of different systems (1000 V or less, AC and DC) may occupy the same raceway.
True
In an indoor wet location, the electrical panelboard metal enclosure shall be at least ___” from the masonry wall.
1/4”
Cables and raceways in or under airport runways shall be buried to a minimum depth of ___”.
18”
At least ___” of free conductor shall be left at each outlet, junction, or switch point.
6”
When a conduit contains three or more conductors, the cross-sectional area of the conductors shall not exceed ___% of the internal cross-sectional area of the conduit.
40%
The continuity of the grounded conductor of a multiwire branch circuit shall never depend upon device connections.
True
The minimum cover for a direct-buried cable in a location not specified in Table 300.5 is ___”.
24”
Raceway systems are always permitted to be used to support other raceways, cables, or nonelectric equipment.
False
Where required, cables or raceways in notches of framing members shall be protected from nails or screws by a steel plate at least ___ “ thick.
1/16”
All cables and conductors emerging from the ground shall be protected from physical damage to a maximum depth of ___” below finished grade.
18”
Cables and raceways installed under streets, highways, roads, driveways, and parking lots shall be buried to a minimum depth of ___”.
24”
Per Table 300.5, RMC shall be buried under 12” of earth beneath a highway.
False
Copper conductors in a vertical raceway require more supports than an equivalent length of aluminum conductors.
True
