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Ever thought about ... ?

gkenyon
I was asked a series of interesting questions this week about fault protection and overload protection for a particular application. Some of these really make you think, and the physics doesn't always lead you where you think you'd go.


Dropping out of all this, was me pointing out something interesting which I wonder whether it's ever crossed the minds of contributors to this Forum ... so here goes.


Ever thought about what, in typical UK installations, protects the electronics in a plug-in [to a standard BS 1363-2 socket-outlet] phone charger / wall-wart type power converter against:

(a) Fault current (consider both cases of L-N and L-PE); and

(b) Overload current ?




Parents
  • 0
    Many modern electrical appliances presumably have conductors smaller than 3-amp fuse wire, so electricians installing 3-amp fused connection units doesn’t make much difference does it?


    Does BS7671 The Wiring Regulations recognise any BS13363 cartridge fuses other than 13-amp and 3-amp as listed in Table 41.4?


    Why aren’t electricians installing other sizes of fuses in fused connection units or manufacturers installation instructions telling them to?
Reply
  • 0
    Many modern electrical appliances presumably have conductors smaller than 3-amp fuse wire, so electricians installing 3-amp fused connection units doesn’t make much difference does it?


    Does BS7671 The Wiring Regulations recognise any BS13363 cartridge fuses other than 13-amp and 3-amp as listed in Table 41.4?


    Why aren’t electricians installing other sizes of fuses in fused connection units or manufacturers installation instructions telling them to?
Children
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