Electrical Circuit Protection Devices Quiz AR 2024

What is the name of the circuit protection device shown in the following diagram?

• RC3PO

• RCD

• MCB

• RCBO

Answer explanation

The RCBO has a reset button and these are also used to upgrade the supply until a re-wire is due.

What is the name of the circuit protection device shown in the following diagram?

• Cartridge Fuse for 3 pin plug

• Switch
• Breaker
• Capacitor

What is the name of the circuit protection device shown in the following diagram?

• MCB

• RCD

• RCBO

• MAIN SWITCH

Answer explanation

Miniature circuit breaker

What is the name of the circuit protection device shown in the following diagram?

• Breaker
• Lock off device on MCB

• Capacitor
• Fuse

Answer explanation

Used in safe isolation process

What size of circuit breaker is fitted to protect the lighting circuit in a domestic consumer unit?

• 20A
• 16A
• 6A
• 10A

Answer explanation

Subz remember that the cable is 1.5mm twin and earth for this lighting circuit ok

What size of circuit breaker is fitted to protect the ring main circuit in a domestic consumer unit?

• 40A
• 32A
• 63A
• 16A

Answer explanation

2.5mm Twin and earth cable used on ring main with 32amp breaker ok Reuven

What size of circuit breaker is fitted to protect the immersion heater circuit in a domestic consumer unit?

• 25 amps
• 20 amps
• 10 amps
• 16 amps

Answer explanation

Remember the immersion heater has an independent circuit from the ring main ok Hayden KRO UTV

If a central heating control circuit uses 500 Watts of electrical power, what size of circuit protection device would normally be fitted to provide over-current protection?

• 7 Amp
• 10 Amp
• 3 Amp
• 5 Amp

Answer explanation

Watts = Volts x Amps

                                                          500 = 240v x A

             Amps = 500/240 = 2.1 amps so nearest fuse is a 3 amp

What size of circuit breaker is typically used to protect the cooker circuit in a domestic consumer unit?

• 32A

• 40A

• 50A

• 20A

What type of circuit protection device is recommended for a home theater system?

• Fuse

• MCB

• RCD

• RCBO