Electrical Exam Help Quiz

What is the adiabatic equation used to calculate?

• Cable grouping

• Size of a protective conductor

• Voltage drop

• Rating factors

What does the symbol 's' represent in the adiabatic equation?

• Cable factor

• Operating time of the fuse

• Fault current

• Size of the conductor

What is the purpose of the adiabatic equation?

• To calculate the size of a protective conductor

• To determine the current carrying capacity

• To choose a suitable cable size

• To calculate the maximum voltage drop

What is the maximum permitted voltage drop for lighting circuits at 230 volts?

• 3 volts

• 5 volts

• 11.5 volts

• 6.9 volts

What does the symbol 'vd' represent in the voltage drop formula?

• Design current

• Actual volts drop

• Millivolts drop

• Length of the circuit

What is the purpose of rating factor tables for cables?

• To limit the overheating of the cable

• To reduce the current carrying capacity

• To decrease the cable size

• To increase the cost of the cable

What does the symbol 'i t' represent in the cable size calculation formula?

• Actual volts drop

• Length of the circuit

• Design current

• Tabulated current

What is the purpose of the rating factor 'cg' for cable grouping?

• To decrease the cable size

• To derate the current carrying capacity

• To reduce the cost of the cable

• To increase the current carrying capacity

What is the tabulated current rating for a cable bunched in a group of four in air, protected by a 10 amp breaker?

• 13.5 amps

• 20 amps

• 15.38 amps

• 17.73 amps

What cable size should be chosen for a 20 amp load in a ceiling void, protected by a 10 amp circuit breaker, and bunched in a group of five cables?

• 2.5 millimeters

• 4 millimeters

• 6 millimeters

• 8 millimeters