01 Safe isolation and earthing

Open Ended

What could be some consequences of not properly earthing and bonding electrical installations?

Multiple Choice

Why is it important to follow safe isolation procedures when working with electricity in plumbing and heating systems?

• To prevent electrical accidents and injuries

• To save time during installation

• To avoid using safety equipment

• To increase the speed of work

Multiple Choice

What is the primary piece of legislation covering occupational health and safety in the UK?

• IET Requirement for Electrical installation BS7671

• Health and Safety Executive Act 1974

• Electrical Test equipment for use on low voltage electrical systems GS38

• Part P Approved document Electrical safety

Multiple Choice

Which document sets the UK standard for electrical wiring and installation?

• The Electricity at Work Regulation (EAWR 1989)

• IET Requirement for Electrical installation BS7671

• Health and Safety Executive Act 1974

• Part P Approved document Electrical safety

Fill in the Blanks

Atoms are made up of three subatomic particles: protons, neutrons, and

.

Multiple Select

Which of the following elements are good conductors due to their free electrons?

• Copper (Cu)

• Silver (Ag)

• Gold (Au)

• All of the above

Open Ended

Describe how current, voltage, and resistance are related in an electrical circuit, using the water analogy shown in the diagram.

Multiple Choice

According to Ohm's Law, what happens to the current through a conductor if the potential difference across it increases, assuming the temperature remains constant?

• The current decreases

• The current remains the same

• The current increases

• The current becomes zero

Multiple Select

Which of the following are considered extra low voltage applications?

• Battery powered tools

• Distribution of power in industrial sectors

• CCTV systems

• Powering large domestic devices

Fill in the Blanks

A transformer that increases voltage is called a

transformer.

Open Ended

Explain how voltage is distributed from a power station to residential homes, mentioning the role of transformers.

Multiple Choice

What is the minimum current that can cause a mild shock in a human body according to the chart?

• 1 milliampere

• 5 milliamperes

• 10 milliamperes

• 30 milliamperes

Multiple Choice

Which device is commonly used in a consumer unit for protection and isolation?

• Rotary isolator

• Plug & socket

• RCD

• Fuse

Multiple Choice

Which features must a voltage tester have to comply with GS38?

• Finger guards, fused, double insulated cable, exposed metal tip not exceeding 4mm

• Plastic casing, wireless, rechargeable battery, exposed metal tip exceeding 4mm

• Single insulated cable, no finger guards, fused, exposed metal tip exceeding 4mm

• Double insulated cable, wireless, plastic casing, exposed metal tip not exceeding 10mm

Open Ended

What issues could we create if we turn off power before the customer is ready?

Multiple Choice

Which of the following are valid points of isolation that can be used to safely isolate electrical equipment?

• MCB

• RCBO

• RCD

• All of the above

Open Ended

Explain why it is important to keep the key after installing a lock off device during the safe isolation process.

Fill in the Blanks

Before testing, we need to check that cables are in

condition and comply with GS38.

Multiple Choice

When testing between Earth and Neutral with a voltage tester, what should the reading be if the circuit is properly isolated?

• 0V

• 230V

• 12V

• 110V

Fill in the Blanks

If a circuit is safely isolated, the voltage reading between Earth and Live should be

Multiple Select

Which of the following pairs should be tested with a voltage tester to confirm isolation in a single-phase circuit?

• Earth to Neutral

• Earth to Live

• Neutral to Live

• Earth to Earth

Open Ended

Why is it important to always check that your tester is working both before and after testing a circuit for isolation?

Multiple Choice

What is the purpose of reproving the tester after isolating the circuit?

• To ensure the tester is still working and the circuit is safe to work on

• To check if the tester needs charging

• To measure the resistance of the circuit

• To identify the type of circuit breaker

Open Ended

Explain the steps you would take to confirm that a circuit is safely isolated before starting electrical work.

Open Ended

What questions do you still have about safe isolation and earthing, or is there any aspect you would like to explore further?

Multiple Choice

Why is it important to follow the safe isolation process when working with electrical installations in plumbing and heating?

• To prevent electrical accidents and injuries

• To save time during installation

• To reduce the cost of materials

• To avoid using guidelines and documents