Earthing and Protection

A collection of flashcards covering key concepts, definitions, and important details related to earthing and protection in electrical systems.

Basic Protection

Keeping people safe from electric shocks during normal use.

Bonding Conductor

A wire that connects metal parts to stop shocks.

Circuit Protective Conductor (CPC)

A wire that sends fault electricity safely to the ground.

Earth

The ground, used as a safe place for electricity.

Earth Fault Current

Extra dangerous electricity that flows when there is a fault.

Earth Fault Loop Impedance

How hard it is for fault electricity to flow back to earth - important for safety switches.

Earthing Conductor

A wire connecting the building's earth point to the ground.

Equipotential Bonding

Connecting metal parts so they have the same electrical charge to avoid shocks.

Exposed Conductive Part

A metal part you can touch that might become live if something goes wrong.

Extraneous Conductive Part

Metal not part of the electrical system (like pipes) that can carry electrical risks.

Live Part

A part that normally carries electricity (even neutral wires).

Fault Protection

Extra safety steps in case something goes wrong with the electricity.

Functional Earth

Earth connections to help equipment work properly (not just for safety).

Leakage Current

Small unwanted electricity leaking out, showing there might be a problem.

PEN Conductor

One wire doing two jobs: safety and neutral.

Residual Current Device (RCD)

A safety switch that cuts off power quickly if it senses a fault.

BS 7671

The main British rulebook for safe electrical work.

Chapters 31, 41, and 54 in BS 7671

Talk about earthing, avoiding electric shocks, and proper installation.

Part 7 of BS 7671

Extra safety rules for risky places like swimming pools and farms.

Compliance with BS 7671

Keeps installations safe and legal.

18th Edition of BS 7671

New and better safety rules.

Consumer Connection to Earth

Every building needs to connect to earth to stay safe.

Ways to Connect to Earth

Methods like direct earthing and PME systems.

Parts You Can Touch at the Same Time

Check and protect against possible shocks.

Best Ways to Install Earthing

Install and bond properly for safety and inspections.

Testing and Maintenance

To make sure earthing and protection still work over time.