test 1 code
Approved drainage openings not smaller than _____ and not larger than ______ in diameter shall be permitted to be installed in the field in boxes or con duit bodies listed for use in damp or wet locations.
1/8 in. 1/4 in.
Volume shall be marked on all nonmetallic boxes and boxes with a volume of ____ or less.
100 in.3 (1650 cm3)
The minimum box width for U pulls must include ____.
12 in. between raceways plus the thickness of the two raceways
A 3- x 2-in. (75- x 50-mm) device box, 2.5 in. (65 mm) deep, has a volume of ____.
12.5 in.3 (205 cm3)
The weight supported by any single conduit shall not exceed ____.
20 pounds (9 kg)
What is the angle pull for a raceway in the vertical dimension where the trade size of the largest raceway is 4 in. and the sum of the other raceways in the same row on the same wall is 5 in.?
29 in.
A 2½-in. rigid metal conduit enters the back of a pull box with a removable cover on the opposite side. The raceway encloses four 4/0 AWG THHN copper conductors and one 4 AWG equipment grounding conductor. The minimum depth (distance from the entry wall to the cover) for this pull box is _____in.
4
What is the maximum number of 12 AWG THW conductors permitted in a 4-in. octa gon box that is 1½ in. deep? (The box contains a fixture stud and a hickey.)
4
A switch rated for 20 amps will be installed in a device box adjacent to a switch rated for 15 amps. Two 12 AWG THHN copper conductors will be terminated onto the switch rated 20 amps and two 14 AWG THHN copper conductors will be terminated onto the switch rated 15 amps. The required volume allowance for the switch rate 20 amps is ______in3 and the required volume allowance for the switch rate 15 amps is ______in3
4.5, 4
For straight pulls, the length of the box shall not be less than _____ the outside diameter, over sheath, of the largest shielded conductor entering the box if the system voltage is over 1000 volts, nominal.
48 times
A luminaire that weighs more than ____ shall be supported independently of the outlet box, unless the outlet box is listed for not less than the weight to be supported.
50 pounds (23 kg)
How many 14 AWG THW conductors are permitted in a 3 in. 3 2 in. 3 2½ in. device box?
6
Luminaires weighing no more than _______ pounds can be supported by boxes (such as device boxes) not specifically designed to support luminaires, provided the luminaire, or its supporting yoke, is secured to the box with at least two No. 6 or larger screws
6
At least _____in. of free conductor (measured from the point in the conduit body where it emerges from its raceway or cable sheath) shall be left at each outlet, junction, and switch point.
6 inches
Nonmetallic surface extensions must be secured in place by approved means at intervals not exceeding _______in.
8
Nonmetallic-sheathed cable not fastened to the box must be secured within ____ of the box.
8 in. (204 mm)
The ____ is the organization, office, or individual responsible for enforcing the requirements of a code.
AHJ
____ or fewer luminaire wires (smaller than 14 AWG) and an equipment grounding conductor can be omitted from box fill calculations if they enter a box from a domed luminaire (or similar canopy) and terminate within that box.
Four
wire, together with strain insulators, is used to support conductors in all spans exceeding 40 ft (12 m) in length.
Messenger
The NRTL program specified in the regulation "OSHA Recognition Process for Nationally Recognized Testing Laboratories" ____.
accredits and regulates independent laboratories
A feeder consists of all circuit conductors located ____.
between the service equipment, the source of separately derived system, or other power supply source and the final branch-circuit overcurrent device
Wire connectors, pigtails, locknuts, bushings, raceway connectors, and grounding screws are not factors when calculating ____.
box fill
Cable connector(s) with a ____ outside the box are not counted when determining the number of conductors.
clamping mechanism
Conductors in concealed raceways, even though they may become accessible by withdrawing them, are still considered ____.
concealed
A grounding electrode is a(n) ____ object that establishes a direct connection to earth.
conducting
An attachment plug establishes connection between ____.
conductors of the attached flexible cord and the conductors permanently connected to the receptacle
Grounded (grounding) is defined as being ____.
connected to ground or to a conductive body that extends the ground connection
An appliance branch circuit supplies energy to one or more outlets for the purpose of ____.
connecting appliance(s)
A load having the maximum level of current sustained for three hours or more is referred to as a ____ load.
continuous
A multiwire circuit must consist of conductors connected to ____.
different phases
"Equipment" is a general term, including fittings, devices, appliances, luminaires, apparatus, machinery, etc. used ____ in an electrical installation.
directly or indirectly
The length of a straight pull for multiple raceways must be at least ____ times the trade size (metric designator) of the largest single raceway.
eight
A means must be provided in each metal box for the connection of a(n) _____.
equipment grounding conductor
Snap switches (including dimmer switches) must be connected to a(n) ____ and must also provide a means to connect metal faceplates to the equipment grounding conductor, even if a metal faceplate is not installed.
equipment grounding conductor
The term "labeled" means that ____.
equipment or material must continue to comply with the appropriate standards (or performance) under which the labeling was granted
The term "listed" means that ____.
equipment, materials, or services meet appropriate designated standards or have been tested and found suitable for a specified purpose
The maximum number of conductors applies only if the box does not contain any ____.
fittings or devices
Panelboards having doors or covers are considered ____.
guarded
Where nonmetallic boxes are used with open wiring or concealed knob-and-tube wiring, the conductors must enter the box through ______.
individual holes
Where a box contains both straight and angle (or U) pulls, or straight pulls and splices, you should calculate each type of pull ____ to find the dimension.
individually
Overcurrent devices do not have to be readily accessible if ____.
located adjacent to the equipment where access is achieved by the use of portable means
Local ordinances ____.
may adopt the NEC® as written or amend the Code with more or less stringent regulations
NEC® tables such as 210.21(B)(3) present a requirement's ____.
multiple application possibilities
A neutral conductor is defined as the conductor connected to the ____ that is intended to carry current under normal conditions.
neutral point of a system
A separately derived system is an electrical source, other than a service, having ____ connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
no direct
Ready access to wiring in luminaires is ____.
not required
Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as ____ unless there are more than four equipment grounding conductors.
one conductor
No requirement specifies the depth of a box, unless a ____.
raceway enters the rear of the box
A contact device installed at an outlet for the connection of an attachment plug is a(n) ____.
receptacle
When metal parts are required to be electrically connected, a(n) ____ is installed, thereby guaranteeing the required electrical conductivity.
reliable conductor (bonding jumper)
Conduit body support must be ____.
rigid and secure
A service point can be described as the point of demarcation between where the ____ ends and the premises wiring begins.
serving utility
Mandatory rules in the NEC® contain the language ____.
shall" or "shall not"
Where multiple rows of raceways enter a box, you should calculate each row separately and use the ____.
single row that provides the maximum distance
Multiconductor cord or cable used to support a box must be protected in an approved manner so that the conductors are not subjected to ____.
strain
The Illustrated Guide to the NEC® should be used as a(n) ____.
supplement to the NEC®
Nonmetallic boxes shall be suitable for the lowest ______ conductor entering the box
temperature-rated
The word luminaire refers to ____.
the complete lighting unit
The UL logo indicates that ____.
the listed product complies with UL standards
All conductors of a multiwire branch circuit must originate from ____.
the same panelboard or similar distribution equipment
In addition to installation rules, the NEC® is concerned with the ____.
type and quality of electrical wiring system materials
Box calculations for 4 AWG and larger conductors (1000 volts or less) are performed based on the ____.
volume of the box
An electrician needs to install a surface-mounted, nonmetallic, weatherproof cabinet on the outside of a concrete block building. Since the cabinet must be mounted in a wet location, it must be mounted so there is at least ______in. of airspace between the cabinet and the wall.
¼
Unused openings, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment, shall be closed to afford protection ______ to the wall of the equipment.
¼
nstallations within or behind a surface of concrete, tile, gypsum, plaster, or other non combustible material, including boxes employing a flush-type cover or faceplate, shall be made so that the front edge of the box, plaster ring, extension ring, or listed extender will not be set back of the finished surface more than ________in.
¼