If you got a tangle of wires like this, always make sure to keep them free of dust because dust can actually lead to fires.
What happens is that the dust that gathers around electrical points absorb moisture in the air and when that comes into contact with an electrical flow then something bad happens.
Scroll down a bit on this page
to see a photo of what happened when a mound of dust caused a fire. Over 1000 accidents with fire are said to be caused by dust like this in Japan every year.