electrical installationmeans fixed electrical cables or fixed electrical equipment located on the consumer’s side of the electricity supply meter;”
extra-low voltagemeans voltage not exceeding— (a) in relation to alternating current, 50 volts between conductors and earth;
low-voltagemeans voltage not exceeding— (a) in relation to alternating current, 1000 volts between conductors or 600 volts between conductors and earth;