From: John Woodgate
Subject: Re: IEC Mains lead. What fuse??
Date: Wed, 25 Sep 2002 12:36:44 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 25 Sep 2002 13:47:52 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that firstname.lastname@example.org wrote (in <3d9195a3.12
email@example.com>) about 'IEC Mains lead. What fuse??', on Wed, 25
>On Wed, 25 Sep 2002 20:45:48 +1000, "Phil Allison"
>> ** For your information, a 13 amp fuse does not blow at 13 amps but at
>>some much higher current. The figure of 13 amps is the "never blow"
>Exactly! So maybe you could draw 15A or more through a connector rated
>at 10A and still the "Safety" device wouldn't actuate. That's 50% over
>the rated "safe" current carrying capability.
>In the UK there is a requirement for every "portable" appilance to be
>regularly inspected/tested for safety and that includes having an
>"appropriate" fuse in the mains plug.
Yes, well, you see, words like 'appropriate' are used in order to
accommodate circumstances like the restricted availability of other than
3 A and 13 A fuses.
You aren't going to find an appliance that takes more than 10 A but is
fitted with a 10 A appliance coupler, because that would violate the
safety standard for the appliance. So you *aren't going to get* 13 A
flowing in the cable.
>Unfortunately unfused leads are
>not generally regarded as "safe" in the UK.
Where they are still used, in special applications such as stage
lighting, they are certainly regarded as safe. They are protected by a
fuse of the 'appropriate' rating.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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