1:6
What is an extension ring used for?
To increase the usable space of a box
The depth of a pull box with conduit runs entering at right angles need be only of sufficient depth to permit locknuts and bushings to be properly installed.
True
When sizing outlet boxes, how many conductors must be deducted for each strap-mounted device?
Two
What are octagon and round boxes mostly used for?
Wall-mounted lighting fixtures (luminaires)
A box constructed so that moisture will not interfere with successful operation is said to be what?
Waterproof
A box constructed so that water will not enter the enclosure under specified test conditions is call what?
Watertight
A box constructed or protected so that exposure to the weather will not interfere with successful operation is referred to as what?
Weatherproof
A conductor under 12" long running through a box counts as how many conductors?
1
If there are four equipment grounding conductors in a box, how many conductors must you deduct from the total allowed?
1
When sizing outlet boxes, how many conductors are deducted for each switch?
1
How many conductors must be deducted for each strap-mounted device in a device box?
2
If the largest trade diameter of a raceway entering a pull box is 3", and it is a straight pull, the minimum size box allowed is?
24"
The minimum length for a junction box in which the conductors are pulled at an angle and that contains two 3" conduits and one 4" conduit entering each side is what?
24"
The maximum weight allowed by the NEC when ceiling fans are mounted directly to an approved, unmarked outlet box is?
35 lbs
Square outlet boxes are available in sizes of 4" and ?
4 11/16
What is the maximum distance between receptacles along the floor line in any wall space?
6'
A box installed under a roofed open porch is considered which type of location?
A damp location
For a straight pull, what is the minimum length of the box?
At least 8x the trade diameter of the largest raceway
What is a device used to physically connect conduit or cable to an outlet box, cabinet, or other enclosure?
Connector
A box designed and constructed to withstand an internal explosion without creating an external explosion or fire is call what?
Explosion-proof
A single-gang outlet box used for surface mounting to enclose receptacles or wall switches on concrete or concrete block construction is called what?
Handy box
Each conductor originating outside of the box and terminating inside of the box counts as what?
Individual conductors
What is an enclosure where one or more raceways or cables enter, and in which electrical conductors may be spliced?
Junction box
Blank covers are used when boxes serve as what?
Junction boxes
All boxes must be sized, installed, and supported to meet which current requirements?
NEC
Factors to consider when installing boxes are covered in?
NEC sections 314.15 - 314.30
What is a metallic or nonmetallic box installed in an electrical wiring system from which current is taken to supply some apparatus or device?
Outlet box
What is an enclosure used to facilitate the installation of cables from point to point in long runs?
Pull box
What means constructed or protected so that exposure to beating rain will not result in the entrance of water under specified test conditions?
Raintight
The capacity of an outlet box can be increased using what?
Raised device covers
