1. Scope 1.1 These requirements cover buried sacrificial magnesium and zinc anodes and zinc and copper/copper sulphate reference electrodes which are intended for use in the cathodic protection of steel underground tanks which have been coated and installed in accordance with the requirements contained in the Standard for Galvanic Corrosion Protection Systems for Steel Underground Tanks for Flammable and combustible Liquids, CAN/ULC-S603.1.