After 12 months packed away in the loft, Christmas lights can easily become electrically unsafe.

To help prevent the most common electrical problems with Christmas lights, and to enjoy a safe and happy festive season, we recommend the following simple precautions and checks.


  • read and follow the manufacturers' instructions
  • check your Christmas lights are not damaged or broken before use and look out for loose wires
  • use only replacement bulbs of the same type and rating as those originally supplied with the lights
  • ensure all outdoor lights are connected via a 30mA RCD protected socket
  • replace failed lamps immediately to prevent overheating
  • ensure plugs and transformers are plugged in indoors, even if the lighting is suitable for outdoor use
  • switch your lights off and unplug them before you go to bed or go out
  • keep lights away from flammable decorations and materials that can burn easily


  • use lights outdoors unless they are specially designed for such use
  • connect different lighting sets together
  • connect lights to the supply whilst still in the packaging
  • remove or insert lamps while the chain is connected to the supply
  • overload sockets - try to avoid the use of extension leads or adaptors
  • attempt to repair faulty lights - replace them
  • use lights that are damaged or faulty

Credit: https://www.electricalsafetyfirst.org.uk/guides-and-advice/electrical-items/christmas-lights/