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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'd guess either or (more likely) both the B16 plus the 5A fuse. One or more of the RCDs might have tripped as well if conditions were damp or the fault current saturated the RCD's cores.


    Unless it was a very long extension lead, then perhaps the 5A alone.


       - Andy.
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  • 0
    I'd guess either or (more likely) both the B16 plus the 5A fuse. One or more of the RCDs might have tripped as well if conditions were damp or the fault current saturated the RCD's cores.


    Unless it was a very long extension lead, then perhaps the 5A alone.


       - Andy.
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