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420 Watt Hedge Trimmer.

Zoomup
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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    Mr. Zoomup, I am not trying to make a case to prove you wrong, but your approved answer is only half right. With a long thin extension lead plus connected hedge trimmer lead, the resistance of the leads can act for a split second as a heating element thus giving a bit of delay before a fuse or circuit breaker will operate. The short is to fast for fuses or circuit breakers to react. A 13amp fuse fitted in the plug-top (usually) can flout established conventions, therefore nothing will trip or blow. Obviously my answer is based on a limited number of cases of same I had to rectify but unexpected results quite true as I have written and precisely true to myself.

    Regards, keep safe

    jcm.    


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  • 0
    Mr. Zoomup, I am not trying to make a case to prove you wrong, but your approved answer is only half right. With a long thin extension lead plus connected hedge trimmer lead, the resistance of the leads can act for a split second as a heating element thus giving a bit of delay before a fuse or circuit breaker will operate. The short is to fast for fuses or circuit breakers to react. A 13amp fuse fitted in the plug-top (usually) can flout established conventions, therefore nothing will trip or blow. Obviously my answer is based on a limited number of cases of same I had to rectify but unexpected results quite true as I have written and precisely true to myself.

    Regards, keep safe

    jcm.    


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