Electric Shock – It’s a lot safer to buy lights which use a transformer. Lights supplied directly from a power point (ie 110VAC … 240VAC) can leak electricity when wet to metal like guttering or posts…. DANGerous!! The IP rating states the immunity from hazards and is a good safety guide to use. 
Fire risk – light bulbs must be kept away from curtains, plastic, etc due to their very high temperature. LEDs are cool, low voltage and not a fire risk. 
Fuses – some plugs have fuses to blow for overloads which can start a fire. Obviously, only replace a fuse with the same type and current rating – see label on light string for details.  
Transformers and controllers are not made for outdoor use unless IP rated 57 or 67. If necessary, use a weatherproof box to house the transformer and controller. 
 Repairing/ testing – make electrical connections with the power 
off and then turn on to test. Then if smoke appears, it’s easier & quicker to turn off! Also don’t breathe this toxic smoke – open windows and leave the room … now!! 
off and then turn on to test. Then if smoke appears, it’s easier & quicker to turn off! Also don’t breathe this toxic smoke – open windows and leave the room … now!! END of Safety
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