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What should I check if multiple floodlights are out on a mast?

If multiple floodlights are out on a mast what should I check?

  1. Check that all cables and connectors are plugged in correctly and plugs are tight/secure
  2. Check that the connector has no water ingress
  3. Check to make sure SPD (surge protection devices) are installed
  4. Check to make sure all breakers are switched on at the mast, fitting, feeder board, main circuit board, and substation. 
  5. Check to make sure the power supply is live (measure voltage with a multimeter)