Question 1

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

Accepted Answer

The two other terminals on a 3-way switch are called traveler terminals. These are used to connect the switch to another 3-way switch, allowing for control of a single light or set of lights from multiple locations. A, B, and D are not appropriate terms for these terminals.

Question 2

How are snap switches and metal faceplates grounded?

Accepted Answer

A metal box is considered adequately grounded provided the metal raceway, Type AC or Type
MC cable, is properly grounded at its origin, NEC 250.118.This being the case, the metal yoke
of the snap switch is considered grounded when secured to the metal box by metal screws.In turn, a metal faceplate is considered grounded when secured to the metal yoke of a snap switch.The effective ground-fault current path is a multistep situation: first the metal raceway or armor must
be grounded; then the metal outlet box must be grounded; then the yoke on the snap switch is grounded; and finally the metal faceplate is grounded by the No.6-32 metal screws that secure the faceplate to the switch.

Question 3

What is electrical noise, and what is its source?

Accepted Answer

"Electrical noise," as referred to when discussing electronic equipment, is any extraneous signal that tends to interfere with the signal normally present in or passing through a system.Induced noise might be EMI (electromagnetic interference) or RFI (radio frequency interference).It might be heard as a hum, buzzing, whining, or static.The cause might be traced to such things as an electric motor, ignition on a furnace, fluorescent and other types of electronic discharge luminaires, nearness to a power line, arc welders, power-supply switching circuits, cellular phones, other audio/video equipment, office electronic equipment, and nearness of computer cables to electric light and power wiring.These things are capable of creating unwanted waveforms that can scramble or distort digital signals.

Question 4

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

Accepted Answer

The answer of What is the difference between the acceptable...

Question 5

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

Accepted Answer

An ac-dc general-use snap switch is always marked with the current and voltage rating to indicate the maximum amount of current and voltage it can handle. This information is crucial in selecting the appropriate switch for a specific application and ensuring safe and reliable operation.

Question 6

An ungrounded conductor is also known as a conductor.

Accepted Answer

An ungrounded conductor is also known as a hot conductor because it carries current under normal conditions, as opposed to a grounded (neutral) conductor that is connected to the earth or to some conducting body that serves in place of the earth.

Question 7

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.

Accepted Answer

Isolated ground receptacles are specifically designed to reduce electrical noise by connecting the grounding wire to a separate grounding conductor that is isolated from the main grounding system. This helps to prevent electromagnetic interference from other devices in the same circuit, and is often used in sensitive electronic applications such as hospital equipment, computer networks, and audio recording studios.

Question 8

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

Accepted Answer

A single-pole switch is used to control a light or group of lights from one switching point, making it the simplest type of switch for basic on/off control from a single location.

Question 9

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

Accepted Answer

A sine wave is the best choice for high-quality voltage because it provides a smooth and continuous waveform that is free from any distortion. This wave shape is commonly used in electrical power systems and electronic devices because it is easy to generate and has a consistent frequency. The other waveform options listed (triangle, square, sawtooth) are not suitable for high-quality voltage because they have sharp transitions and high levels of harmonic distortion.

Question 10

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

Accepted Answer

The answer of How common are double-pole switches, and where...

Question 11

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.

Accepted Answer

The answer of When using cable for the wiring of...

Question 12

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

Accepted Answer

Hospital-grade receptacles are designed for heavy use and resistance to abuse, making them suitable for high traffic areas or places where medical equipment is used. Electronic equipment receptacles are designed to protect sensitive equipment from power surges or other electrical disturbances, but do not necessarily have the same level of durability. Isolated ground receptacles are used in locations where electrical interference must be minimized. Locking plug receptacles are used to prevent accidental disconnection of equipment, but may not have the same level of durability and resistance to abuse as hospital-grade receptacles.

Question 13

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

Accepted Answer

The NEC 406.2(D) specifies that isolated ground receptacles must have an orange triangle on their face to indicate their special grounding configuration.

Question 14

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

Accepted Answer

Snap switches are commonly referred to as "toggle switches" or "wall switches" by electricians due to their quick actuation mechanism, where a small physical force is applied to snap the switch between on and off positions.

Question 15

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

Accepted Answer

The National Electrical Code recommends an impedance of 1 ohm or less for the grounding path associated with normal equipment grounding for branch-circuit wiring. However, an impedance of 2 ohms is generally deemed acceptable in most cases. This low impedance is necessary to ensure that any fault current will be safely and quickly directed to the ground.

Question 16

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 .

Accepted Answer

The standard colors for cable wiring are black, white, and red. Therefore, the best choice to complete the three conductor cable colors would be red.

Question 17

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

Accepted Answer

The answer of The differences in plugs and receptacles are...

Question 18

How do you prevent neutral conductors from overheating?

Accepted Answer

The answer of How do you prevent neutral conductors from...

Question 19

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

Accepted Answer

A cover that is placed on a recessed box containing a receptacle or a switch is called a faceplate. Groundplate and double-pole are not commonly used terms for covers or plates in electrical installations, and a raised cover is typically used for protecting junction boxes and other larger electrical devices.

Question 20

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.

Accepted Answer

The requirement mentioned in the question is for Ground Fault Circuit Interrupters (GFCIs). These devices protect against ground faults and provide personal protection against electrical shock.

Quiz 5: Switches and Receptacles

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

How are snap switches and metal faceplates grounded?

What is electrical noise, and what is its source?

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

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

An ungrounded conductor is also known as a conductor.

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.

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

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

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

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.

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

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

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

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 .

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

How do you prevent neutral conductors from overheating?

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

Quiz 5: Switches and Receptacles

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

How are snap switches and metal faceplates grounded?

What is electrical noise, and what is its source?

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

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

An ungrounded conductor is also known as a conductor.

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.

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

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

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

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.

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

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

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

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 .

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

How do you prevent neutral conductors from overheating?

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

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