Cable size selection is based on 3 main factors: Current carrying capacity, Voltage regulation, Short circuit rating. Also used in connection to meters • Brown, inner core • Compliant with BS EN 6004 • Temperature rating: -15°C to +70°C • Min.

size should the earthing conductor be? | Voltimum What size should the earthing conductor be? | Voltimum

b) Bonding connections to incoming metal services should be made as near as practicable to the point of entry of the services into the premises, but on the consumer’s side of any insulating section. The fault current is the electrical current which flows through a circuit during an electrical fault condition. The adiabatic equation is based on the assumption the earth fault current is so short that none of the heat energy produced in the protective conductor escapes before the protective device operates.Remember BS7671 is not a legal document so everything is "interpretation" and even using the on-site guide it is not "legally" binding and generally is written way way to the safe side of the regs.

Cable 10m Coil Time 6491X Green/Yellow 1-Core 16mm² Conduit Cable 10m Coil

d) The connection must be made using clamps ( to BS 951) and be suitably protested against corrosion at the point of contact. is a non standard size protective conductor size, so the next size up is 10mm2 is acceptable, which saves money installing a 16mm2. Guidance on earth conductor and protective bonding conductor cross-sectional areas is given in the guide to the wiring regulations BS7671. In the situation, you describe the calculation would need to be completed to determine whether the earthing conductor is adequate. The main protective bonding conductors shall have a cross-sectional area of not less than half that required for the earthing conductor and not less than 6mm².Earthing is a safety measure to prevent electric shock, whereas bonding is a term used for connecting together all the metallic parts that are not supposed to be carrying electric current . Earth cables offer protection against accidental electric shock by providing a route for current that would otherwise pass through a person, by limiting the increase in voltage that can occur in a device. Protective conductors (including earth and bonding conductors) of 10mm² cross-sectional area or less shall be of copper. If your doing one or two runs and the cost isn't important then fair enough, use the standard size in the wiring regs as a guide.