In message <cda6fd39.1ae7a%[email protected]>, dated Wed, 1 May 2013,
Scott Xe <[email protected]> writes:
Thanks for your reply. The fuse is said to protect the cordset from
over heating in case of short circuit. It seems the standard restricts
the input current to 13A due to practicability issue as a higher
priority. How can they justify 13A current flow is safe for 0.75mm2
cord?
The probability of getting a continuous high fault current is very low;
most short-circuits result in a current of hundreds of amps, which clear
the fuse in a very short time.
If you pass 13 A (go and return) through a 0.75 mm^2 cable that is not
coiled up, it gets warm but does not present a serious hazard, although
its life is shortened. There have been overheating problems with
coiled-up cables but cable reels now carry a warning notice.
This is a case where strict technical issues and practicability come
into conflict.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
They took me to a specialist burns unit - and made me learn 'To a haggis'.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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