CH 9 and 10 Commercial Wiring
An outlet box for a recessed incandescent luminaire shall be at least ___' from the fixture if the branch-circuit conductors are not suitable for the temperature.
1
Five different switches are defined in Article 100.
False right answer is six different switches
Ten uses are permitted for flexible cords and cables per 400.10.
False, correct is 11 uses
Class A GFCIs are designed to operate when the ground fault current flow is between 10 mA and 15 mA.
False, correct is 5 mA
In the 2020 NEC ®, electric vehicle cable types EV, EVE, and EVT had their voltage ratings changed from 600 V to 750 V.
False, correct is 600V-1000V
A(n) ___ luminaire is a luminaire that generates light from an arc lamp contained within an outer tube.
HID or high intensity discharge
The two types of wire termination configurations for calculating wire-bending space are ___.
L and S
All panelboard cabinets and frames of panelboards shall be connected to an EGC.
T
A(n) ___ is an overcurrent protective device with a mechanical mechanism that may manually or automatically open a circuit when an overload condition or short circuit occurs.
a. circuit breaker
Snap switch terminals marked CO/ALR are for use with ___ conductors.
aluminum copper copper-clad aluminum all of the above
A(n) ___ is any utilization equipment which performs one or more functions.
appliance
An identified ___ is required to be securely installed between adjacent snap switches rated over 300 V.
barrier
A(n) ___ is an overcurrent protective device with a mechanical mechanism that may manually or automatically open the circuit when an overload condition or short circuit occurs.
circuit breaker
Electric-discharge lamps operate at a much ___ temperature than incandescent lamps.
cooler
In the 2020 NEC, cable types such as AC cable and MC cable are considered to be flexible type cables.
f
There are ___ types of snap switches.
four
Double-throw knife switches mounted vertically shall be equipped with a locking device to prevent ___ from closing the blades.
gravity
___-grade receptacles are the highest grade receptacles manufactured by the electrical industry.
hospital
Ceiling fans shall be supported independently of an outlet box or by a listed outlet box or outlet box system ___ for the use.
identified
The arrangement of busbars and conductors in switchgear or a switchboard shall be such as to avoid overheating due to ___ effects.
inductive
A(n) ___ is a complete lighting unit consisting of a light source such as a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and ballast (where applicable), and to connect the lamps to the power supply.
luminaire
In general, vertically mounted switches shall be ___ in the up position.
on
___ is installing a lamp of a higher wattage than that for which the luminaire is designed.
overlamping
A(n) ___ is a single panel or group of assembled panels with buses and overcurrent devices, which may have switches to control light, heat, or power circuits.
panelboard
Lighting track fittings shall not be equipped with general-purpose ___.
receptacles
Panelboards supplied through transformers generally shall have their overcurrent protection located on the ___ side of the transformer.
secondary
A(n) ___ is a device, with a current and voltage rating, used to open or close an electrical circuit.
switch
A(n) ___ is a large single panel, frame, or group of assembled panels with buses, overcurrent devices, and instruments.
switchboard
All lighting track shall be permanently installed and permanently connected to a branch circuit.
t
All recessed HID luminaires shall be thermally protected.
t
Generally, flexible cords and flexible cables shall be installed in continuous lengths without splices or taps.
t
In general, only ungrounded conductors shall be opened by switches.
t
Lampholders shall not support lamps weighing over 6 lb.
t
Metal faceplates are required to be grounded.
t
Switchgear, switchboards, and panelboards are installed to control light and power circuits.
t
The neutral of an electrical system is always carrying the unbalanced current of that system.
t
Trees may be used to support outdoor luminaires.
t
A(n) ___ luminaire is a luminaire designed with an internal thermal protective device that senses excessive operating temperatures and opens the supply circuit to the luminaire.
thermally protected
A(n) ___ switch is a switch with a marked OFF position that is part of an appliance.
unit
A surface-mounted switch installed in a wet location shall be enclosed in a(n) ___ enclosure.
weatherproof
An electric-discharge luminaire utilizes a(n) ___ for the operation of the lamp.
ballast
The major difference between flexible cords and flexible cables is the number of insulated ___.
conductors
A minimum of ___" clearance shall be provided for recessed portions of luminaires from all combustible materials.
1/2
Metal cabinets or cutout boxes installed in a wet location shall be spaced ___" off the wall to which they are mounted.
1/4
Flexible cords not smaller than ___ AWG are considered protected by the overcurrent device.1
18
Per Section 402.6, the minimum size of a luminaire fixture wire is ___ AWG.
18
Where there is ___ sq in. of surface area of exposed combustible wall or ceiling finish exposed, an outlet box must be covered with a noncombustible material to remove the concern about fire.
180
The flexible cord for a kitchen in-sink food waste disposer shall be from ___" to ___" in length.
18; 36
Handholes are not required in ___' or less metal poles which support luminaires if the base is hinged.
20
A space of not less than ___' shall be provided between the top of a switchboard and a combustible ceiling.
3
Any branch-circuit conductor located within ___" of a ballast, within a ballast compartment, shall have an insulation rating not lower than 90°C.
3
Conduits or other raceways including their fittings shall not rise more than ___" above the bottom of switchgear, switchboards, or floor-mounted panelboards.
3
Electric fixtures are not permitted within ___' of the horizontal bathtub rim zone.
3
Snap switches are permitted to be grouped or ganged in an enclosure provided the voltage between adjacent snap switches does not exceed ___ V.
300
In the NEC®, there are ___ conditions where a grounded conductor does not need to be provided.
5
Within sight is visible and no more than ___' from the object.
50
Surface-mounted fluorescent fixtures can be installed above the door or on the ceiling with a minimum clearance of only ___" free space from the nearest storage space point.
6
The center of the grip of the operating handle of a knife switch, when in the highest position, shall not be more than ___ above the floor or working platform.
6' 7"
Outlet boxes used as the sole support of a ceiling suspended fan shall be listed and marked as being suitable and shall not support fans that weigh more than ___ lbs.
70
Electric fixtures are not permitted within ___' of the vertical bathtub rim zone.
8
