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Security Light Surge Trips MCB


  • Subject: Security Light Surge Trips MCB
  • From: nick@xxxxxxxxxxxxxxx
  • Date: Mon, 18 Oct 2004 20:04:10 -0000



All my C-Bus outputs are protected with quick acting MCBs.  One of
the circuits controls two outside security lights of 300W each, so a
total of 600W or around 2.5A.

The circuit concerned is fitted with a 3A breaker.  The breaker trips
out every time the lights switch on.  I can reset it by hand and the
lights come on and stay on.  I can only assume that the surge current
at switch on is exceeding 3A by enough and for long enough to trip
the breaker.

Is there a rule of thumb to work out the switch on surge current for
2 x 300W halogen bulbs?

Cheers,

Nick

http://www.nicklocke.co.uk/Auto






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