Procedures for Safely Isolating Supplies part 3

What is the primary purpose of isolating electrical supplies in building services engineering?

• To increase voltage

• To ensure safety

• To reduce costs

• To enhance efficiency.

Why is safe isolation important before starting work on electrical appliances?

• To prevent electrical shock

• To save time

• To increase power

• To reduce noise

Safe isolation should be undertaken before any kind of work starts on ________.

• Furniture

• Electrical appliances

• Vehicles

• Plumbing systems

Which of the following is used to control the temperature in a heating system?

• Immersion heater

• Thermostat

• Plug

• Spur

Fill in the blank: An _______ is used to heat water in a tank.

• Thermostat

• Immersion heater

• Plug

• Spur

Which of the following is associated with electrical connections for appliances?

• Thermostat

• Immersion heater

• Plug/Spur

• None of the above

Which of the following is used for heating water in a household?

• Cookers

• Boilers

• Valves

• Refrigerators

Which of the following is used to measure electrical voltage and current?

• Non-contact voltage indicator

• Multimeter

• Approved voltage tester with proving unit

• GS38 standard

The GS38 standard specifies that test probes should have a maximum diameter of ___ mm, preferably ___ mm.

• 5, 3

• 4, 2

• 6, 4

• 3, 1

What is the first step in the safe isolation procedure?

• Prove the appliance is live

• Test the voltage indicator on a known source

• Identify the source for the supply

• Switch off MCB, lock and label.