Where are the ring mains typically located in a modern dwelling?

• All in the kitchen

• One in each bedroom

• One downstairs, one upstairs, and one in the kitchen

• Two downstairs and one upstairs

How many lighting circuits are there usually in a modern dwelling?

• 1

• 2

• 3

• 4

What areas of a dwelling are the lighting circuits typically divided into?

• Kitchen and bathroom

• Living room and bedrooms

• Upstairs and downstairs

• Inside and outside

What might the three radial power circuits in a typical modern dwelling be used for?

• Washing machine, dishwasher, and refrigerator

• Cooker, central heating, and alarm

• Television, computer, and gaming console

• Lights, sockets, and doorbell

What do consumer units incorporate to provide protection against earth leakage?

• A fuse

• An RCD

• A switch

• A circuit breaker

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

• Plastic construction

• Wooden construction

• Metallic construction

• Glass construction

How are the MCBs arranged in the consumer unit?

• They are arranged in a single bank protected by one RCD.

• They are split into two banks, each bank being protected by its own RCD.

• They are not protected by any RCDs.

• They are all combined into one device that also includes an RCD.

What do the MCBs protect in the consumer unit?

• Only the main double pole isolator.

• The RCDs and the main double pole isolator.

• Individual circuits such as ring final circuits, lights, and power circuits (radials).

• They do not protect any circuits, only the consumer unit itself.

What does an RCBO combine the functions of?

• An RCD and a main double pole isolator.

• An MCB and a main double pole isolator.

• An MCB and an RCD.

• Two separate MCBs.

What is the function of the Earth bar in a consumer unit?

• To distribute electricity to different circuits

• To protect circuits from overload

• To provide a common grounding point

• To measure the consumption of electricity