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If your lighting circuit does not have an adequate earth you can either have your wiring upgraded to incorporate an earth or use lighting that is double insulated. Scroll down for more information on double insulated lighting.
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 are four reasons why you, or your electrician, require double insulated lighting:
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)