Capstone - Voltage Drop

Question 1

Any point in an electrical installation must not exceed what value of voltage drop from it’s nominal supply voltage?

Answer 1

5%

Question 2

What is nominal voltage in a low voltage system in Australia?

Answer 2

230/400V 10% to -6%

Question 3

What is nominal voltage in a low voltage system in Australia?

Answer 3

230/400V 10% to -6%

Question 4

What is the Point of Supply in an underground service?

Answer 4

Service pillar (green dome)

Question 5

What is the Point of Supply in an aerial service?

Answer 5

Mains connection box

Question 6

What parts of an electrical service and installation is the electrician responsible for?

Answer 6

From the consumer side of the POS to the installation, and within the installation

Question 7

Which tables of the AS/NZS 3008 are used to calculate voltage drop?

Answer 7

T40-42

Question 8

When caculating voltage drop, Vc values are given in ______ phase.

Answer 8

Three phase

Question 9

When calculating voltage drop, you must convert VC from _______ phase to _______ phase.

Answer 9

Three phase to single phase

Question 10

The current value used to calculate voltage drop in a circuit may be defined by any one of which factors?

Answer 10

1 - Total of the connected load supplied through the circuit; or
2 - Maximum demand of the circuit; or
3- Current rating of the circuit protective device.

Question 11

50% of the current rating of the protective device (ie circuit breaker) may be used for calculating voltage drop for which type of circuit

Answer 11

Final sub-circuit with distributed load (ie GPOs and lights)

Question 12

When selecting cable based on a voltage drop calculation, you must choose a cable that has a Vc (greater than, less than) the calculated value.

Answer 12

Less than