Yesterday I commented that there was almost no detail in the question and the answer referred to a 2. Cable size selection is based on 3 main factors: Current carrying capacity, Voltage regulation, Short circuit rating. This 16mm² Single Core Earth Cable is suitable for power and lighting circuits, building wiring, use in conduits and closed installation ducts and internal appliance wiring. 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.

Pitacs Conduit Cable (6491X) 16mm2 G/Y Earth Drum - Toolstation

c) Where practicable, the connection to the gas, water, oil, etc service should be within 600mm of the service meter, or a point of entry to the building if the service meter is external and must be on the consumer’s side before and branch pipework and after any insulating section in the service. Aside from the ones needed to make our site work properly we use Google Analytics to monitor how the site performs.Also used in connection to meters • Brown, inner core • Compliant with BS EN 6004 • Temperature rating: -15°C to +70°C • Min. 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 Cable 16mm 6491X Per Metre · Quickbit Electrical UK

Would I consider sizing it to half of the combined area of the 3 (240mm2) size as in half of 720 mm2 or half of each 240mm2 . The distributor may require a minimum size of earth conductor at the origin of the supply of 16mm² copper or greater for TN-S and TN-C-S supplies. 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. Guidance on earth conductor and protective bonding conductor cross-sectional areas is given in the guide to the wiring regulations BS7671.Protective conductors (including earth and bonding conductors) of 10mm² cross-sectional area or less shall be of copper. 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. a) Only copper conductors should be used: copper covered aluminium conductors or aluminium conductors or structural steel can only be used is special precautions outside the scope of the Wiring Guide are taken. In the situation, you describe the calculation would need to be completed to determine whether the earthing conductor is adequate.