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Exam 5: Switches and Receptacles

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Question 1

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The differences in plugs and receptacles are based on the and voltage rating of the device.

A) resistance
B) conductance
C) geometry
D) ampacity

E) A) and C)
F) C) and D)

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Question 2

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In commercial buildings, protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms, in kitchens, on rooftops, outdoors, within 6 ft (1.8 m) from the outside edge of any sink, in indoor wet locations, in locker rooms with adjacent shower facilities, and in garages, bays, and similar areas.

A) NEC
B) EWC
C) GFCI
D) HOT

E) A) and B)
F) None of the above

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Question 3

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How do you prevent neutral conductors from overheating?

An acceptable impedance for the grounding path associated with normal equipment grounding for branch-circuit wiring is ohms.

When the wiring method is cable, you are stuck with the conductor insulation colors typically provided by the manufacturer.For three conductor cable, this will typically be black, white, and .

How common are double-pole switches, and where are they used?

A switch is used where it is desired to control a light or group of lights, or other load, from one switching point.

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.

The cover that is placed on a recessed box containing a receptacle or a switch is called a .

What is the difference between the acceptable impedance of a ground path for branch-circuit wiring and the acceptable impedance for electronic equipment?

A 3-way switch has a common terminal to which the switch blade is always connected, and it has two other terminals called terminals.

An ac-dc general­use snap switch is always marked with the .

An ungrounded conductor is also known as a conductor.

In locations where severe abuse or heavy use is expected, receptacles are recommended.

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.

Quality voltage provides a clean wave that is free from distortion.

How are snap switches and metal faceplates grounded?

Most electricians refer to switches as "toggle switches" or "wall switches."

What is electrical noise, and what is its source?

Isolated ground receptacles are required by NEC 406.2(D) to have a(n) triangle on their face.