WorksheetsElectrical Exam Help Quiz
Total questions: 15
Worksheet time: 8mins
What is the adiabatic equation used to calculate?
Voltage drop
Size of a protective conductor
Rating factors
Cable grouping
What does the symbol 's' represent in the adiabatic equation?
Cable factor
Fault current
Operating time of the fuse or breaker
Size of the conductor
What is the maximum permitted voltage drop for lighting circuits at 230 volts?
12 volts
9 volts
6 volts
3 volts
What does the symbol 'mvam' represent in the voltage drop formula?
Length of the circuit in meters
Design current of the attached equipment
Millivolts drop in the cable
Voltage drop in the circuit
Where can the rating factor tables for various cable conditions be found?
Page 383
Page 409
Page 196
Page 373
What does the symbol 'i t' represent in the cable size calculation formula?
Tabulated current
Tabulated voltage drop
Tabulated size
Tabulated cable factor
What does the rating factor 'cg' represent in cable grouping?
Ambient air temperature
Derating factor
Cable arrangement
Number of cables grouped together
What is the tabulated current rating for a cable bunched in a group of four in air?
19.38 amps
17.38 amps
15.38 amps
13.38 amps
What cable size should be chosen to carry a 20 amp load in a ceiling void at 40 degrees centigrade?
10 millimeter cable
4 millimeter cable
2.5 millimeter cable
6 millimeter cable
What is the maximum permitted voltage drop for all other circuits at 230 volts?
3 volts
6 volts
9 volts
12 volts
What does the symbol 'k' represent in the adiabatic equation?
Fault current
Operating time of the fuse or breaker
Size of the conductor
Cable factor
Where can the table for twin and earth cable be found in the wiring regulations book?
Page 409
Page 196
Page 383
Page 373
What is the tabulated current rating for a cable bunched in a group of five in air?
21.73 amps
19.73 amps
17.73 amps
15.73 amps
What cable size should be chosen to carry a 10 amp load in a ceiling void at 35 degrees centigrade?
2.5 millimeter cable
4 millimeter cable
6 millimeter cable
10 millimeter cable
What is the maximum permitted voltage drop for lighting circuits at 230 volts?
3 volts
6 volts
9 volts
12 volts
