Plumbing, elec unit week 1

How many ring mains would a typical dwelling have?

• 1

• 2

• 3

• 4

Where are ring main circuits typically located in a modern dwelling?

• Bedroom, kitchen, dining room

• Bedroom, kitchen, living rooms

• downstairs, upstairs, kitchen

• garage, upstairs, downstairs

What might 3 power circuits in a typical modern dwelling be used for?

• Washing machine, dishwasher and fridge

• Cooker, heating and alarms

• tv, computer and sound system

• Lights, sockets and doorbell

What do consumer units house?

• 
  Individual MCBs for radial and ring final circuits.

• Individual RCCBs for radial and ring final circuits.

• Individual fuses for radial and ring final circuits.

• Individual circuit breakers for light circuits only.

As of 2019, what is the construction requirement for all consumer units that are installed?

• Non-metallic construction

• 
  Plastic construction

• Wooden construction

• Metallic construction

What does an RCBO combine the functions of?

• residual current device (RCD) and a fuse
• circuit breaker and a surge protector
• residual current device (RCD) and a power strip
• residual current device (RCD) and a miniature circuit breaker (MCB)

Identify the component labeled as "Busbar" in the consumer unit.

• Plastic cover for the unit
• A metal bar that distributes power to the circuit breakers

• A bar that measures the amount of electricity used

• A bar that connects to the water pipes for grounding

What is a typical use for a 6A MCB?

• Lighting circuits

• heating systems

• To regulate water flow in a plumbing system
• radial circuits

What is the maximum operating current for a residual current device (RCD) for a 32A domestic ring main

• 30mA
• 35mA
• 20mA
• 40mA

How quickly should the RCD disconnect in the event of a current exceeding the threshold to protect a 32A circuit?

• 50 milliseconds
• 30 milliseconds
• 60 milliseconds
• 40 milliseconds