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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 ?




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    I too have my doubts about plug-in wall-warts, especially those that come with the more......'budget' devices. I've openned up a couple of cheap Chinese ones that came with items from a well known auction site... and, after seeing the component count and they way they had been built - never even plugged them in - they went in the bin & were replaced by units from RS or Farnell.


    I like to use a plugin type three way adapter (I use the three way because they almost always have an outlet on the front and are always fused). I replace the 13A fuse with a 1A fuse & blank off the other two outlets. I especially insist on doing this for wall-warts which operate out-of-sight & out-of-mind.
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  • 0
    I too have my doubts about plug-in wall-warts, especially those that come with the more......'budget' devices. I've openned up a couple of cheap Chinese ones that came with items from a well known auction site... and, after seeing the component count and they way they had been built - never even plugged them in - they went in the bin & were replaced by units from RS or Farnell.


    I like to use a plugin type three way adapter (I use the three way because they almost always have an outlet on the front and are always fused). I replace the 13A fuse with a 1A fuse & blank off the other two outlets. I especially insist on doing this for wall-warts which operate out-of-sight & out-of-mind.
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