EPC 35 - Installation of Cables & Final Sub-circuits

Question 1

List FOUR factors which must be considered when selecting a wiring system for a particular installation? (Give the Wiring Rules Clause Number).

Answer 1

Protection against shock. 
Protection against external influences. 
Mutual detrimental influences.
Cable selection. 
Reliability of terminations. 
Identification of conductors. 
Protection against fire.

AS/NZS 3000 Clause; 3.1.2

Question 2

Describe EIGHT different types of wiring system and give a typical example of where each one could be used. (Give the Wiring Rules Clause Number).

Answer 2

TPS, PVC conduit, Steel conduit, Underground, Catenary, Aerial, Ducting, Cable tray, Busway, Armoured, MIMS.

AS/NZS 3000 Clause; Table 3.1

Question 3

According to AS/NZS 3000, what is the maximum number of 10A socket outlets that may be installed on a 2.5mm final sub-circuit protected by a 16A circuit breaker in a domestic installation?
(Give the Wiring Rules Clause Number).

Answer 3

16 points. AS/NZS 3000 Table C9

Question 4

Is it necessary to clip cables in a roof space if the roof is less than 0.6m above the ceiling?
(Give the Wiring Rules Clause Number).

Answer 4

No. AS/NZS 3000 Clause 3.9.3.3.1(c).

Question 5

Is it permissible to clip TPS cables to a ceiling joist within 50mm of the ceiling?
(Give the Wiring Rules Clause Number).

Answer 5

No. AS/NZS 3000 Clause 3.9.4.3.2.

Question 6

What is the largest diameter hole that is allowed in a wall for cables to pass through without fire rating protection? (Give the Wiring Rules Clause Number).

Answer 6

25mm. Clause 3.9.9.3 (ii).

Question 7

May conductors that form part of a different electrical installation be installed within the same enclosure? (Give the Wiring Rules Clause Number).

Answer 7

No. Clause 3.9.8.2.1(a).

Question 8

Underground wiring systems are classified as one of three types. Name them.
(Give the Wiring Rules Clause Number).

Answer 8

Cat A, Cat B, Cat C.

AS/NZS 3000 Clause 3.11.2.

Question 9

What is the minimum depth of cover for a Cat B underground wiring system installed under 80mm of poured concrete, external to a building?
(Give the Wiring Rules Clause Number).

Answer 9

300mm.

AS/NZS 3000 Table 3.6.

Question 10

How deep must Orange Marker tape be buried above an underground wiring system?
(Give the Wiring Rules Clause Number).

Answer 10

50% of the depth of cover.

AS/NZS 3000 Clause 3.11.4.5.