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Double Insulated Lighting for the Garden

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. Some customers prefer to use double insulated lighting in the garden as this avoids concerns about corrosion damaging the connection of an earth lead to the light fitting.  Scroll down to the bottom of this page for more information on double insulated lighting in your garden.

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Double insulated lighting for the garden - information and advice

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, requires double insulated lighting:

  1. You have no earth present in your lighting circuit.
  2. The earth present on your circuit is inadequate, insufficient or faulty
  3. Your electrician cannot route an earth cable directly to your lighting because of existing features or fixtures i.e. paving or hard landscaping.

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).