Earth Bonding

Circuit Protective Conductor (CPC)

• earth conductor is running through the circuit

Main Equipotential Bonding Conductors

• MIN CSA – 10mm²
• from the Main Earth Terminal to the water and gas services (the point where they enter the building)
• 600mm MAX between the outlet of a Gas meter and earth bonding clamp

Mains Earth Bonding

• from the main fuse to the consumer unit
• Protects against indirect contact
• MIN CSA – 16mm²

Supplementary Equipotential Bonding

• electric shower and bath,  metal sink
• Continuity test – low reading ohmmeter
• MIN CSA – 6mm² (4mm)
• Double insulated electrical parts are not required to be earthed

Temporary Bonding

• Two crocodile clips connected by 10mm² sheathed conductor
• Temporary bond is at least 1.2m of a single core flexible cable

Earth Rod

•  MIN 1.2m long
• Connected by MIN 16mm² earth cable

Main Earth Bar

• used to connect all earth cables together

Earthing of Appliances

• Earth cable is the last to disengage if cable being tugged
• 13A MAX Fuse for a plug on a ring main socket