Double insulated Class 2 electrical equipment has all exposed metalwork separated from the conductors by at least two layers of insulation, so that the metalwork cannot become live. There is no earth connection in the lighting and often manufacturers specify that no earth shall connect to the fitting. Your safety depends upon the integrity of the two layers of insulation.
British double insulated equipment is marked with the double insulated logo (one square inside another), states “DOUBLE INSULATED” or Class II.
So why would you require double insulated lighting? Here’s four reasons why you, or your electrician, requires double insulated lighting:
1 You have no earth present in your lighting circuit.
2 The earth present on your circuit is inadequate or insufficient
3 Your electrician cannot cross bond between your lighting and other electrical items in the bathroom.
4 Your electrician cannot route an earth cable directly to your lighting because of existing decoration or tiling.
References:
IEC 61140: Protection against electric shock — Common aspects for installation and equipment. International Electrotechnical Commission. 2001. (formerly: IEC 536-2: Classification of electrical and electronic equipment with regard to protection against electric shock, 1992)
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