9189 Phase 3 : PP3

Which of the following is a typical electrical circuit found in a dwelling?

• Ring main

• Solar panel

• Wind turbine

• Geothermal pump

A typical modern dwelling may have 3 x _______ circuits, perhaps for a cooker, central heating, and alarm.

• Ring main

• Lighting

• Power circuit (radial)

What do consumer units house for radial and ring final circuits?

• Individual MCBs

• RCDs

• Transformers

• Fuses

As of 2019, all consumer units that are now installed shall be of a _______ construction.

• Plastic

• Wooden

• Metallic

• Ceramic

What is the purpose of the main double pole isolator in a consumer unit?

• To protect individual circuits

• To split MCBs into two banks

• To protect the consumer unit

• To combine functions of MCB and RCD.

The MCBs are split into two banks, with each bank being protected by its own ____.

• RCBO

• RCD

• Main double pole isolator

• MCB

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

• Connects to the live wire

• Provides a path to ground

• Distributes power to circuits

• Connects to the neutral wire

In a consumer unit, the _______ is responsible for distributing power to the circuits.

• Earth bar

• Neutral bar

• Busbar

• Live in

What is the primary function of MCBs (miniature circuit breakers)?

• To increase current flow

• To protect and isolate circuits in an over-current situation

• To decrease voltage

• To provide power to circuits.

MCBs are rated depending on their ______.

• voltage

• trip current

• size

• color