What Do You Know About Wire And Cables?

1. Non-listed wire may be used anywhere other than a plenum.

True

False

The correct answer is False because non-listed wire should not be used anywhere, including plenum areas. Plenum areas are spaces used for air circulation in buildings, such as the area above a drop ceiling or below a raised floor. These areas are required to use plenum-rated cables, which are specifically designed to have low smoke and flame spread in case of a fire. Using non-listed wire in a plenum area can pose a safety hazard as it may contribute to the spread of fire and toxic fumes. Therefore, it is incorrect to say that non-listed wire can be used anywhere other than a plenum.

Explanation

The correct answer is False because non-listed wire should not be used anywhere, including plenum areas. Plenum areas are spaces used for air circulation in buildings, such as the area above a drop ceiling or below a raised floor. These areas are required to use plenum-rated cables, which are specifically designed to have low smoke and flame spread in case of a fire. Using non-listed wire in a plenum area can pose a safety hazard as it may contribute to the spread of fire and toxic fumes. Therefore, it is incorrect to say that non-listed wire can be used anywhere other than a plenum.

2. The most common type of tubing used in the security industry for raceways is

FMC

HDPE

EMT

RNC

EMT stands for Electrical Metallic Tubing, which is the most common type of tubing used in the security industry for raceways. EMT is made of steel and is highly durable, providing excellent protection for electrical wires and cables. It is also easy to install and is widely available, making it a popular choice for security installations. HDPE, RNC, and FMC are not commonly used in the security industry for raceways, making EMT the correct answer.

Explanation

EMT stands for Electrical Metallic Tubing, which is the most common type of tubing used in the security industry for raceways. EMT is made of steel and is highly durable, providing excellent protection for electrical wires and cables. It is also easy to install and is widely available, making it a popular choice for security installations. HDPE, RNC, and FMC are not commonly used in the security industry for raceways, making EMT the correct answer.

3. Which of the following wiring methods are permitted to be used in a ceiling area designated for environmental air?

EMT

Flexible metal conduit

Rigid metal conduit

Any of the above

None of the above

Any of the above wiring methods are permitted to be used in a ceiling area designated for environmental air. This means that EMT, flexible metal conduit, and rigid metal conduit can all be used in this specific area.

Explanation

Any of the above wiring methods are permitted to be used in a ceiling area designated for environmental air. This means that EMT, flexible metal conduit, and rigid metal conduit can all be used in this specific area.

4. Electrical metallic tubing must be securely fastened within _____ of every box, cabinet, or termination fitting, and at intervals not exceeding ______.

12 inches / 5 feet

3 feet / 10 feet

18 inches / 10 feet

6 inches / 10 feet

Electrical metallic tubing must be securely fastened within 3 feet of every box, cabinet, or termination fitting, and at intervals not exceeding 10 feet. This ensures that the tubing is properly supported and reduces the risk of damage or disconnection. By fastening the tubing at these intervals, it maintains stability and prevents it from sagging or becoming loose. This spacing also allows for easy access and maintenance if needed.

Explanation

Electrical metallic tubing must be securely fastened within 3 feet of every box, cabinet, or termination fitting, and at intervals not exceeding 10 feet. This ensures that the tubing is properly supported and reduces the risk of damage or disconnection. By fastening the tubing at these intervals, it maintains stability and prevents it from sagging or becoming loose. This spacing also allows for easy access and maintenance if needed.

5. Which of the following is not a test used when approving Class 2 low-voltage transformers?

Circuit Secondary Voltage Test

Testing for compliance with CP-01 standards when packaged as a complete assembly

Output Current and Power Test

Rated Output Heating Test

The question asks for a test that is not used when approving Class 2 low-voltage transformers. The options include Circuit Secondary Voltage Test, Testing for compliance with CP-01 standards when packaged as a complete assembly, Output Current and Power Test, and Rated Output Heating Test. The correct answer is Testing for compliance with CP-01 standards when packaged as a complete assembly. This means that this test is not used when approving Class 2 low-voltage transformers.

Explanation

The question asks for a test that is not used when approving Class 2 low-voltage transformers. The options include Circuit Secondary Voltage Test, Testing for compliance with CP-01 standards when packaged as a complete assembly, Output Current and Power Test, and Rated Output Heating Test. The correct answer is Testing for compliance with CP-01 standards when packaged as a complete assembly. This means that this test is not used when approving Class 2 low-voltage transformers.

6. When using electrical metal tubing, the maximum distance between pull points (boxes) is

100 feet

50 feet

The length of your snake.

Undefined. There is no maximum distance specified in the code.

NFPA 70, 358.26

Explanation

NFPA 70, 358.26

7. If the edge of the framing member or furring strip is less than 1¼ inch away, a _____-thick steel plate of sufficient length and width must be installed to protect the wiring method from screws and nails.

1/8 inch

1/16 inch

1/4 inch

1/2 inch

If the edge of the framing member or furring strip is less than 1¼ inch away, a 1/16 inch thick steel plate of sufficient length and width must be installed to protect the wiring method from screws and nails. This means that if the distance between the framing member or furring strip and the wiring method is less than 1¼ inch, a 1/16 inch thick steel plate should be used as a protective barrier to prevent damage to the wiring from screws and nails.

Explanation

If the edge of the framing member or furring strip is less than 1¼ inch away, a 1/16 inch thick steel plate of sufficient length and width must be installed to protect the wiring method from screws and nails. This means that if the distance between the framing member or furring strip and the wiring method is less than 1¼ inch, a 1/16 inch thick steel plate should be used as a protective barrier to prevent damage to the wiring from screws and nails.

8. Cables or raceways that run parallel to framing members or furring strips must be protected where they are likely to be penetrated by nails or screws by installing the wiring method so it isn't less than ______ from the nearest edge of the framing member or furring strips.

3/4 inch

1/2 inch

1 1/4 inch

1 inch

Cables or raceways that run parallel to framing members or furring strips must be protected where they are likely to be penetrated by nails or screws by installing the wiring method so it isn't less than 1 1/4 inch from the nearest edge of the framing member or furring strips. This distance ensures that the cables or raceways are adequately protected and reduces the risk of damage from nails or screws.

Explanation

Cables or raceways that run parallel to framing members or furring strips must be protected where they are likely to be penetrated by nails or screws by installing the wiring method so it isn't less than 1 1/4 inch from the nearest edge of the framing member or furring strips. This distance ensures that the cables or raceways are adequately protected and reduces the risk of damage from nails or screws.

9. Wires must be protected from physical damage anytime they are

Within 10 feet of the floor.

Within 10 feet of the ceiling.

Within 7 feet of the floor.

Exposed.

Wires must be protected from physical damage anytime they are within 7 feet of the floor. This is because wires that are closer to the floor are more susceptible to damage from foot traffic, furniture, or other objects that may come in contact with them. By providing protection for wires within 7 feet of the floor, the risk of damage and potential hazards such as electrical shocks or short circuits can be minimized.

Explanation

Wires must be protected from physical damage anytime they are within 7 feet of the floor. This is because wires that are closer to the floor are more susceptible to damage from foot traffic, furniture, or other objects that may come in contact with them. By providing protection for wires within 7 feet of the floor, the risk of damage and potential hazards such as electrical shocks or short circuits can be minimized.