Conductors

Question 1

Which table is used to determine whether a type of flexible cord is suitable for a particular use?

Answer 1

Table 11

Question 2

Which table is used to determine if a type of conductor is suitable for a particular use?

Answer 2

Table 19

Question 3

How do you calculate the minimum size of the neutral conductor for a building/system?

Answer 3

Rule 4-024 states that there won’t be any reduction in size of a neutral conductor for the portion of the load that consists of electric-discharge lighting, non-linear loads, or the first 200A of the unbalanced load.

1. Subtract 200A from the maximum unbalanced load of the building
2. If applicable, subtract any electric-discharge lighting and non-linear loads from the maximum unbalanced load
3. Apply a 70% demand factor to whatever is left of the maximum unbalanced load
4. Add the 200A, electric-discharge lighting, and non-linear loads back into the remainder of the unbalanced load
5. Select your neutral conductor according to this ampacity
6. Use table 2 or table 4 to select your conductor

Question 4

Which table would you use to to calculate voltage drops?

Answer 4

Table D3

Question 5

How do you determine the Distance Correction Factor of a conductor?

Answer 5

(Load Current/Conductor Allowable Ampacity) X 100% = DCF

Question 6

How do you calculate the maximum distance a specific utilization point may be located from a branch circuit overcurrent device?

Answer 6

Table D3 Distance X DCF X %Volt Drop X (Applied Voltage/120V) = Total Distance

Question 7

When the question gives you the wire size, how do you apply the derating factors?

Answer 7

1. Multiply the derating factors together to get the total derating factor
2. When you’re given the wire size, you multiply the derating factors by the ampacity of the conductor

Question 8

When the question gives you the load (Amps) how do you apply the derating factors?

Answer 8

1. Multiply the derating factors together to get the total derating factor
2. When the question gives you the load, you divide the derating factor by the load to determine the maximum current you could run through the conductor

Question 9

What is the maximum allowable voltage drop in the wiring feeding remote lamps of an emergency lighting system?

Answer 9

Maximum allowable voltage drop is 5% of te applied voltage

Rule: 46-212

Question 10

What is maximum conductor termination temperature for equipment if it is not marked anywhere?

Answer 10

1. 60°C for equipment rated not more than 100A or equipment marked for use with No. 1 AWG or smaller conductors
2. 75°C for equipment rated more than 100A or equipment marked for use with conductors larger than No. 1 AWG