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From: John Woodgate
Subject: Re: IEC Mains lead. What fuse??
Date: Fri, 27 Sep 2002 14:35:38 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 27 Sep 2002 15:27:38 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Phil Allison
wrote (in ) about 'IEC
Mains lead. What fuse??', on Fri, 27 Sep 2002:
>"John Woodgate" wrote in message
>> I read in sci.electronics.design that Phil Allison
>> wrote (in ) about 'IEC
>> Mains lead. What fuse??', on Fri, 27 Sep 2002:
>> > Anyone even faintly familiar with how people treat appliances
>> >knows that a user accessable and replaceable fuse is NO safety device at
>> > It is simply an unknown quantity.
>> > If an appliance lead needs protecting for fire risk reasons
>> >the device that does so should NOT be readily accessable to the user.
>> Well, our experience with the ring-main system over 50 years or so is
>> that it DOES work OK. We don't get the problems you envisage.
> ** What are you on about JW? Where have I criticised the "ring
Oh, dear, here we go again! The ring-main system includes as an
essential feature the provision of fuses in plugs. So when you raise
objections to fuses in plugs, that is an objection to an essential
feature of the ring-main system.
Now you might argue that you don't object to fuses in plugs but to their
being user-accessible. But if people had to get an electrician in to
change a plug fuse, what would the bill look like? 'To fuse GBP 0.10. To
call-out charge GBP 40. Plus VAT.' Not acceptable, I feel!
>> With centrally-fused spur wiring, the protection is by the fuse in the
>> fusebox. So when we had that system, we had equipment with 5A leads
>> (there are a few things allowed 2A leads - shavers and soldering irons,
>> for example) plugged into circuits fused at 15 A or even 'nail'.
>> Are houseowners allowed access to fuseboxes in Oz? Do they always repair
>> or replace a fuse correctly? Or does everyone have MCB boxes?
> ** A fuse box is not an appliance. You are obfuscating again.
I don't think so. You object to user-accessible fuses in plugs because
of the risk of incorrect replacement. Nails can be put in fuseboxes just
as they can in fused plugs. So it's reasonable to ask what the practice
on this is in your country. Do you have user-accessible fuses or not?
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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