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Classification of electrical equipment

Created: 18/10/2006


Class I – Earthed equipment. Fuses are also present so that if there is a short-circuit making the equipment “live”, current will pass to earth causing the fuse to blow.

Class II – Double-insulated equipment (not earthed)

Class III - Safety extra low voltage (SELV <24 volts AC)


Type B – Class I, II or III.  Low leakage current 0.5 mA Class I and 0.1 mA class II

Type BF – Similar to type B but safer because patient is isolated

Type CF – Lower current leakage, 0.05 mA for class I and 0.01 mA for class II, protects against microshock

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