EPC 27 - Aerial & Underground Wiring Requirement

Question 1

What is the minimum permissible size for a copper aerial conductor? (Give the Wiring Rules Clause Number).

Answer 1

6mm.

AS/NZS 3000 Clause 3.12.2.2(a).

Question 2

What is the maximum current carrying capacity of 16mm? bare aluminium cable installed where the wind speed is up to 2m/s according to AS/NZS 3008.1.1?

Answer 2

128A.

AS/NZS 3008.1.1 Table 21 C4

Question 3

Single insulated PVC cable can be installed underground enclosed in heavy duty rigid PVC conduit. Which category of wiring system would this come under according to the Wiring Rules? (Give the Wiring Rules Clause Number).

Answer 3

Category A.

AS/NZS 3000 Table 3.5.

Question 4

What is the minimum permissible distance between underground wiring and other underground services?

Answer 4

100mm from other services.

AS/NZS 3000 Clause 3.11.5.

Question 5

An installation requires a Category A underground wiring system to be installed under 50mm thick paving bricks. What is the minimum permissible depth at which it should be laid? Give the Wiring Rules Table number.

Answer 5

0.5m.

AS/NZS 3000 Table 3.6.

Question 6

What is the rating factor for a 25mm? multicore cable buried direct in the ground at a depth of
1m according to AS/NZS 3008.1.1?

Answer 6

0.95. AS/NZS 3008.1.1 Table 28(1) Column 2.