G107A - Cable Selection (Max Demand)

The maximum number of lighting points that can be connected to a circuit wired in 1.0mm²  TPS cable and protected by a 10A type C CB is:

• 10

• 15

• 20

• 25

Answer explanation

Table C9 - Guidance on the loading of points per final sub circuit.

Lighting points = 0.5A per light

10A CB / 0.5A = 20 Lights

When the maximum demand is determined by measurement, the demand shall be determined:

• Over any 30 minute period

• Over any 30 minute period  when the highest demand is recorded

• By the highest indication of an ammeter connected to the supply

• By the current setting of a fixed setting circuit breaker or by the load setting of an adjustable circuit breaker

Answer explanation

AS 3000 Clause 2.2.2 Maximum Demand

c) Measurement

In a non-domestic installation what would be the contribution of a 15 A multi-phase outlet wired in 2.5 mm² and protected by a 25 A circuit breaker:

Answer explanation

Table C9 Column 6

What is the minimum C.S.A and type of insulation required for unprotected consumer mains installed U/G?

• 16mm SDI Cu

• 10mm XLPE Al

• 16mm XLPE Cu

• 10mm XLPE Cu

Answer explanation

NSW SR Clause 2.6.1 & T2-1

In NSW SR, what table tells us the minimum C.S.A for overhead consumer mains?

(Enter answer as Table #-#)

Answer explanation

NSW SR Clause 3.4 Cable requirements

Table 3-3

25mm Al

What is the minimum Killowatt rating for a motor to require a three phase supply?

Answer explanation

NSW SR Clause 1.12.3.3 Number of Phases

Table 1-1 Allowable Number of Phases

The number of socket outlets that can connect to a power circuit in an air conditioned office wired in 2.5 mm² TPS cable protected by a 16 A circuit breaker?

Answer explanation

AS 3000 Table C9

The number of socket outlets that can connect to a power circuit in a non-air conditioned office wired in 2.5 mm² TPS cable protected by a 20 A circuit breaker?

Answer explanation

AS3000 Table C9

What is the load group for an Off-Peak HWS?

• Ai

• F

• E

• D

Answer explanation

AS 3000 Table C1 Continued

What is the loading of 16 lights in a single domestic installation according to Table C1?

Answer explanation

AS 3000 Table C1 Max Demand ai)