Mod 4
The cover that is placed on a recessed box containing a receptacle or a switch is called a ____.
Faceplate
When using cable 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 three continuous white stripes (not too common) as a switch supply only if the conductor is permanently reidentified by painting or other effective means.
Gray
Which raceway(s) may be used where cinder fill is present
IMC , RMC, RNMC
which raceway(s) can be used in hazardous locations
IMC, EMT, RMC
For motors, the preferred OCPDs are ____.
Inverse-time circuit breakers
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
For insulations where the nonlinear load is hugeq, most consulting engineers will specify _______ -rated transformers
K
Connects to the neutral point of a system that is intended to carry current under normal conditions
Neutral Conductor
The common point on a wye-connected polyphase system or the mid-point on a single phase system is the _________________________.
Neutral Point
______ means in name only if not in fact
Nominal
____ Law proves that in a given circuit, the higher the impedance, the lower the current flow.
Ohm's Law
Isolated ground receptacles are required by NECâ 406.3(D) to have a(n) ____ triangle on their face.
Orange
In general, the letter-type designation R formerly referred to a ___-based covering and now indicates thermoset insulation.
Rubber
Quality voltage provides a clean ____ wave that is free from distortion.
Sine
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
Most electricians refer to ___ switches as "toggle switches" or "wall switches"
Snap
A 3-way switch has a common terminal to which the switch blade is always connected, and it has two other terminals called ____ terminals.
Traveler
To get accurate current readings where harmonics are involved, an meters referred to as "_______" must be used.
True MS
The differences in plugs and receptacles are based on the ____ and voltage rating of the device.
ampacity
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 (3.0 m) or not more than 10% of the total circuit length.
ampacity derating
Enclosures for receptacles in damp locations shall be weatherproof when a(n) ____ is not inserted.
attachment plug cap
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
A rectangle with parallel diagonal lines as the fill pattern represents a ____.
distribution panel
The symbol for ____ consist of two parallel lines inside, and sometimes extending out of, a circle.
duplex convenience receptacles
In locations where severe abuse or heavy use is expected, ____ receptacles are recommended.
hospital-grade
Voltage drop in a circuit is calculated by multiplying the current flow times the ____.
impedance
Several factors or conditions can cause conductors to overheat, but often overlooked is the possibility of ____.
induction heating
Metal raceways not properly grounded could become "____" and present a shock hazard.
live
The purpose of the National Electrical Codeâ is the practical safeguarding of ____ from hazards arising from the use of electricity.
persons and property
If the raceway is for use of the ____ system, the line will be broken and an uppercase T will be inserted.
telephone
When calculating feeder ampacity _____ non coincidence loads (loads unlikely to be operated simultaneously such as air conditioning and the heating) need to be included
the next higher standard rating may
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 than ____ current-carrying conductors exists, an adjustment factor from NEC® Table 310.15(B)(3)(a) must be applied.
three
NEMA-rated motors are designed to operate at plus or minus ____ percent of their rated voltage.
10
If the ambient temperature anywhere along the length of a raceway is higher than ____ degrees F, the ampacity of the conductors in the raceway, or cable, must be modified by a correction factor.
86
An ungrounded condcutor is also known as a ___ conductor.
Hot
____ are distribution points for electrical circuits.
Panelboards
Which raceway(s) may be used in wet locations
RNMC, EMT, IMC, ENMT, RMC
An acceptable impedance for the grounding path associated with normal equipment grounding for branch circuit wiring is ___ ohms.
1-2
According to NECâ 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%
What is the shrinkage of a 30 degrees offset that is 10 degrees in height?
2 1/2
What is the maximum percent conductor fill for a rectangular metal wireway
20%
NEC Article ______ states that the neutral can be a current carrying conductor
310.15(B)(5)
Often the load is such that parallel conductors should be considered. This usually occurs with loads over ____ amperes.
400
NEC Article ____ applies to motors, including those that are a part of motor-operated appliances unless "specifically amended" by NEC Article 422.
430
What line of code dictates where the disconnect for a motor controller is to be located?
430.120(B)(2)
A single piece of equipment consisting of a multiple receptacle comprised of four or more receptacles shall be calculated at not less than ____ volt-amperes per receptacle.
90
______ wire is seldom used in branch circuits, but because of weight and cost factors; it is frequently selected for feeders and services
Aluminum
Where do you find the trade sizes for insulation
Annex C
an item of utilization equipment such as commonly found in homes; example are clothes washers, refrigerators, and blenders
Appliance
The phrase "____ load" is used to designate when the value is in compliance with the requirements of NEC Article 220.
Calculated load
Where in the NEC do you find voltage drop?
Chapter 9 Table 8
Multioutlet branch-circuit ratings are limited to 15-, 20-, 30-, 40-, and 50-ampere except on ____ premises, where they may have a higher rating.
Commercial
An ac-dc general-use snap switch is always marked with the ____.
Current and voltage rating
