Re: Laser printer draws current in a spike, what for?

From: John Woodgate (jmw_at_jmwa.demon.contraspam.yuk)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 23:15:51 +0100

I read in sci.electronics.design that phil-news-nospam@ipal.net wrote
(in <cgvv6622lj3@news1.newsguy.com>) about 'Laser printer draws current
in a spike, what for?', on Mon, 30 Aug 2004:

>I don't know that this would affect it all that much, but I've also
>heard that in UK, available fault current at homes tends to be higher
>than in the US (one transformer serving a whole block of homes instead
>of the typical 1 to 4 in the US). I'm not sure I'd really like having
>higher available fault current.

The transformer impedance is lower but the cables add impedance (mostly
inductance unless they are buried coaxials). The typical fault currents
in UK and US are not a lot different, i.e. in USA the impedance of a 120
V supply is about half that of a European 230 V supply. But note
'typical'. There is a lot of variation. 

-- 
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

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