DN final 3
NEC Article _____ addresses air-conditioning and refrigeration equipment that incorporates hermetic refrigeration motor-compression
440
The allowable ampacity of a 4 AWG THHN conductors is 95 amperes. if we have four 4 AWG THHN conductors, what is the adjusted ampacity
76
What is the metric designator for a raceway of trade size 3
78
___ is a thin wall metal raceway that is not permitted to be threaded
Eletricial metallic tubing (EMT)
Which item in the general clauses and conditions is of value to the contractor and his estimator only
Notice to bidders
if more than one symbol is located immediately adjacent to another its usually means that a multi-gang box for multiple wiring devices and ____ are to be installed
a single cover
Proof of the flux cancellation principle can demonstrated using a clamp-on _____
ammeter
The difference in plugs and receptacles are based on the ____ and voltage rating of the device
ampacity
According to NEC table 220.12, armories and auditoriums should have a calculated unit load of at least____ volt-amperes per square meter
11
A sign outlet is assigned a minimum allowance of ____ volt amperes for each branch circuit required
1200
When sizing conductors and overcurrent protection, you must take 100 percent of the noncontinuous loads plus ____ percent of the continuous loads
125
For show window lighting, allow _____ volt-amperes per linear foot (660 volt-amperes per linear meter), or use the connected load if that value is higher
200
The two most popular types of PVC are Schedule 40 and Schedule__
80
If the ambient temperature anywhere along the length of a raceway is less than 78 degrees F or higher than ___ degrees F, the ampacity of the conductors in the raceway, or cable must be modified by a correction factor
86
In commercial buildings, ____ protection is required for all 125-volt, single-phase,15- and 20- ampere receptacles installed in bathrooms, in kitchen, on rooftops, outdoors, within 6ft from the outside edge of any sink, in indoor wet locations, in locker rooms with adjacent shower facilities, and in garages, bay, and similar areas
GFCI
Liquid-tight flexible nonmetallic conduits marked as ____ has a smooth seamless inner core and cover bonded together and one or more reinforcement layers between the core and covers for layered conduit.
LFNC-A
The wording on a counterfeit UL logo might say "approved" instead of"____"
LISTED
The term ____ is defined by the NEC as a channel that is designed and used expressly for the purpose of holding wires,cables, or busbar
Raceway
An exception to the ____ rule where two different temperatures are encountered for the same conductors permits the application of the higher ampacity(lower temperature) if the length of the conductors that enter a higher temperature is not more than 10 ft or not more than 10% of the total circuit length
ampacity derating
Who may submit a proposal to change the NEC using the proposal form found in the back of the NEC
anyone
Allowing metal shaving from a drilling operation to fall onto live parts of electrical equipment generally results in a ____,which can cause a deadly burn
arc blast
the construction plans for a building are often called ____
blueprints
Where PVC conduit is connected to box or enclosure, a ___ is recommended
box adapter
The phrase"____load" is used to designate when the value is in compliance with the requirements of NEC Article 220
calculated
When all conductors of the same alternating- current circuit are in the same raceway, the magnetic flux around each conductor ____ the magnetic flux of the other circuit conductors
cancels out
When raceways are installed vertically in the building, from one floor to another, the vertical direction may be represented by the arrow symbol inside a(n)
circle
Compression fittings for EMT are classified as rain-tight and ____-tight types
concrete
The phrase "____load" is used to designate the value of the value of the load as it actually exist
connected
When concealed raceways are drawn on plans, they usually are shown as____
curved .lines
A rectangle with parallel diagonal linies as the fill pattern represents a ____
distribution panel
when turning a standard disconnect switch on,___ of the switch
do not stand on the left
The symbol for ____ consists of two parallel lines inside, and sometimes extenfing out of a circle
duplex convenience receptacles
When a box contains fittings such as luminaire studs, clamps, or hickeys, the number of conductors permitted in the box is one less for ____ device
each type of
The cover that is placed on a recessed box containing a receptacle or a switch is called a ___
faceplate
When pulling three conductors or cables into a raceway, if the ratio of the raceway diameter to the conductor diameter is between 2.8 and 3.2, jamming can occur. With ____ or more conductors or cables, jamming is highly unlikely
four
When using cables for the wiring of 3-way switches, NEC 200.7(C)(1) permits the use of a conductor with insulation that is white or __ or has 3 continuous white stripes(not too common) as a switch supply only if the conductor is permanently reidentified by painting or other effective means
grey
the typical outlet notation "H" designates a ____ outlet
horizontally mounted
An ungrounded conductor is also known as a _____ conductor
hot
Voltage drop in a circuit is calculated by multiplying the current flow times the _____
impedance
Type MC cable is a factory assembled of one or more insulated circuit conductors with or without optical fibers members enclosed in an armor of ____ metal tape, or a smooth or corrugated metallic sheath
interlocking
To reduce "electrical noise"(electromagnetic interference), circuits with receptacle outlets that serve loads such as cash registers, computers, or other sensitive electronic equipment are often supplied by ____ receptacles
isolated ground
In the metric system, what is the prefix for 1000
kilo
To plan any electrical wiring project, the first steps is to determine the ____ that the electrical system is to serve
load
Flexible metal and nonmetallic conduit are commonly used to connect recessed or lay-in____. when used in this manner, electricians refer to it as a "fixture whip"
luminaires
_____ boxes are used primarily to install ceiling outlets
octagonal
Isolated ground receptacles are required by NEC 406.2(D) to have a(n) ____ triangle on their face
orange
_____ schedules are typically provided to detail the circiuits and overcurrent protection required for distribution equipment
panelboard
The purpose of the national electrical code is the practical safeguarding of ____ from hazards arising from the use of eletricity
persons and property
The NEC defines a(n)____ as one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved
qualified person
At least one____ is required to be installed above each linear 12 ft (3.7 m) section of show window
receptacle outlet
In general, the letter-type designation it formerly referred to a _____-based covering and now indicates thermoset insulation
rubber
A ___ switch is used where it is desired to control a light or group of lights, or other load, from one switching point
single pole
A switch symbol without a number beneath the horizontal line means that a ____ switch should be installed
single pole
if the raceway is for use of the _____ system, the line will be broken and a uppercase T will be inserted
telephone
According to the supplementary general conditions,who is responsible for any utilities that are damaged
the contractor
Count the neutral conductor of a 4-wire,3-phase,wye connected circuit when the major portion of the load is electric discharge lighting (fluorescent, mercury vapor, high- pressure sodium,etc) data processing, and other loads where the neutral conductor carries____ current
third harmonic
Whenever a grouping of more then ____ current carrying conductors exists, an adjustment factor from NEC table 310.15(B)(3)(a) must be applied
three
a(n) _____ box is used for surfaces or concealed installations
trade size 4x4 square
The term____ means not connnected to ground or a conductive body that extends the ground connection
ungrounded
Conduit bodies are often referred to in the trade as "condulets" and "_____"
unilets