Re: Why does laptop PSU have an earth wire?

Spiny Norman wrote:

[...]

You don't fit a 13 amp fuse in every plug either. Most of the plugs
have a 3 amp fuse in them. 13 amp in kettles and washing machines
etc. The PC I'm using has a 5 amp fuse in it. The monitor has a 3 amp.
I even have 2amp fuses in the drawer but I can't recall what they go
into at the moment:) The fused plug is primarily to protect the lead
but with so much equipment not having internal protection these days
they offer a modicum of protection for the equipment.

Yippee, I've finally found someone on Usenet that understands the UK wiring
system. Thank you, you've saved my sanity!

BTW, 2A fuses were introduced for things like lamps, but often a failing
filament shorts the lamp out. The 2A plug-top fuse then usually blows
before the lamp's internal fuse.The plug-top fuse generally gets replaced
with the first one A.Consumer can find, which is bound to be a 13A!

Out of interest, (or possibly not :-)), although values of 2, 3, 5, 7, 10
and 13A are available, only 3A and 13A are recognised by BS.

Chris

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