Cable Management Calculations Steps

Question 1

What type of magnetic field would a cable carrying AC current induce?

Answer 1

It will induce a changing magnetic field.

Question 2

How tightly should cables be packed in conduit or trunking containments?

Answer 2

Up to 45%

Question 3

What are the tables for conduit containment that are short and straight?

Answer 3

Tables 52J.1 and 52J.2

Question 4

What cables are used for conduit that is long or has bends?

Answer 4

Tables 52J.3 and 52J.4

Question 5

What tables are used for trunking containment?

Answer 5

Tables 52J.5 and 52J.6

Question 6

What is the first step when calculating cable containment?

Answer 6

To find the factor(s) of the specific cable cross-sectional area.

Question 7

What is the second step?

Answer 7

To multiply the factor of each individual cable csa by the number of runs.

Question 8

What is the third step?

Answer 8

To add all the factors that have been multiplied by the runs together to get a total.

Question 9

What is the last step?

Answer 9

To find the dimensions needed for the containment, which has to be nearest and above the total factor.

Question 10

If you spot two promising containment size answers, which one should you pick and why?

Answer 10

The larger containment size because this gives you the freedom to add more cables in the future if need be without replacing everything.