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420 Watt Hedge Trimmer.

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The owner of the 420 Watt hedge trimmer decided to redesign the 0.75mm2 two core flex by cutting through it. This caused a dead short. His house is supplied by a TN-C-S supply. It has a consumer unit in the house with a B16 M.C.B. dedicated to supply his garage. The house consumer unit is a split load type with 30mA R.C.D.s. The hedge trimmer had a 13 amp plug fuse fitted. It was supplied via an extension lead fused at 5 Amps.


In the garage, where the hedge trimmer was plugged in,  there is a two way garage unit with a B16 M.C.B. for the sockets and a 30 mA R.C.D.


When the hedge trimmer flex was cut through which protective device(s) tripped off or ruptured?


Z.




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    I had an experience while a child (well teenager) where I cut through the flex on our hedge trimmer, dead short... Nothing blew. The flex was about 50m of 0.75 orange 2 core, but it was the old tinned copper red/black flex. 13A fuse in the plug (due to using the same cord with a 1400w lawnmower, the 5's tended to blow before the lawn was done, big old victorian garden). Plugged in via a 'powerbreaker' plug in RCD into a 30 amp ringmain protected by the old wylex plug in MCB's. TN-S supply with 60amp incoming fuse. 


    having a sparking flex jammed in the hedgetrimmer scared me enough to replace the flex with 1.0mm and invest in a 7 amp fuse!
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  • 0
    I had an experience while a child (well teenager) where I cut through the flex on our hedge trimmer, dead short... Nothing blew. The flex was about 50m of 0.75 orange 2 core, but it was the old tinned copper red/black flex. 13A fuse in the plug (due to using the same cord with a 1400w lawnmower, the 5's tended to blow before the lawn was done, big old victorian garden). Plugged in via a 'powerbreaker' plug in RCD into a 30 amp ringmain protected by the old wylex plug in MCB's. TN-S supply with 60amp incoming fuse. 


    having a sparking flex jammed in the hedgetrimmer scared me enough to replace the flex with 1.0mm and invest in a 7 amp fuse!
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