Class III equipment must be supplied from a safety isolating transformer to BS 3535. Three-phase alternating current with neutralįault (indication of assumed fault location)Ĭlass II appliance (Equipment in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as supplementary insulation are provided, there being no provision for connection of exposed metalwork of the equipment to a protective conductor, and no reliance upon precaution to be taken in the fixed wiring of the installation).Ĭlass III appliance (Equipment in which protection against electric shock relies on supply at SELV and in which voltages higher than those of SELV are not generated) Two-phase alternating current with neutral The following symbols are extracted mainly from IEC 60617, supplemented by references from other Standards. Standard symbols, units and graphical symbols for general electrical purposes.
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