Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 23 replies
  • Subscribers 32 subscribers
  • Views 2608 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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.




  • 0
    I threaded by hedge trimmer flex through a bit of old hosepipe so it is now too fat to get into the teeth of a hedge trimmer. (that was after I cut the flex once).

  • 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.    


  • 0
    jcm:

    Mr. Zoomup, I am not trying to make a case to prove you wrong, but your approved answer is only half right.   


     


    My Dear Sir,

                            your observations are most welcome and are very illuminating. The facts as set out were confirmed by me in a real life situation so are accurate in their description of the event.


    Thank you for taking the time to contact me.


    Yours sincerely,


    Z.


    Head of Hedge Trimmer Repair Dept.


Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines