100A - Rating of Main Service Fuse, 25 mm 2 - Size of Meter tails for a modern domestic property, 16 mm 2 - Size of main earthing conductor associated with a modern domestic property, 10 mm 2 - Size of main equipotential bonding conductor, 600 mm - Length of the connection between gas, water, oil service point & service meter, 150 mm - Distance between Consumer unit & main gas point,

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