Voltage Drop Calculations Quiz

What is the maximum permitted voltage drop for a lighting circuit according to table 4ab in the wiring regulations?

• 6.9 volts

• 10.5 volts

• 8.2 volts

• 4.5 volts

What is the actual volts drop for a 3 kilowatt water heater wired in 2.5 millimeter twin earth cable with a circuit length of 44 meters?

• 14.1 volts

• 12.6 volts

• 8.7 volts

• 10.3 volts

What is the maximum length of a one millimeter twin and earth cable for a lighting circuit to not exceed the maximum permitted volts drop of 6.9 volts?

• 32.5 meters

• 39.2 meters

• 42.8 meters

• 47.6 meters

What is the maximum length of a six millimeter twin and earth cable for a 7 kilowatt cooker to not exceed the maximum permitted volts drop of 11.5 volts?

• 45.3 meters

• 51.8 meters

• 58.2 meters

• 63.7 meters

What is the mvam number for 2.5 millimeter twin earth cable according to table 4d5 in the wiring regulations?

• 22

• 25

• 18

• 15

What is the design current for a 230 volt, 7 kilowatt cooker?

• 30.4 amps

• 33.7 amps

• 28.6 amps

• 25.3 amps

What is the maximum permitted voltage drop for a non-lighting circuit according to table 4ab in the wiring regulations?

• 5.2 volts

• 6.9 volts

• 8.5 volts

• 11.5 volts

What is the actual volts drop for a 65 meter lighting circuit wired in one millimeter twin and earth cable with a maximum load of 4 amps?

• 12.7 volts

• 11.4 volts

• 11.2 volts

• 9.8 volts

What is the maximum length of a cable for a lighting circuit to not exceed the maximum permitted volts drop of 6.9 volts, if the mvam number for the cable is 20 and the design current is 5 amps?

• 40.2 meters

• 36.4 meters

• 32.5 meters

• 27.8 meters

What is the maximum length of a cable for a non-lighting circuit to not exceed the maximum permitted volts drop of 11.5 volts, if the mvam number for the cable is 30 and the design current is 10 amps?

• 31.7 meters

• 35.2 meters

• 39.8 meters

• 44.6 meters