Hi Scott I seem to remembr on what we call double insulated 2-wire units
that you should not be able to touch metal with a British Standard childs
finger :-)) i.e via vents etc.
Alan
----- Original Message -----
From: "Scott Tilley" <[email protected]>
To: <[email protected]>
Sent: Monday, October 10, 2011 10:38 PM
Subject: Re: LF: mains wires
> On 10/10/2011 1:19 AM, mal hamilton wrote:
> > Tnx Scott and others for the info. Your system is more complicated
> > because of the 117 v and 230v dual supply required.
> > In the UK there is more conformity to wiring and the plugs are non
> > reversible into the socket, whereas your 2 blade plug goes in either
> > way round and no Earth. In EU their 2 pin plug is also reversible but
> > does have an earth.
> There is a conformity here too. Just different!
>
> Ours is non-reversible as well. The neutral blade on a reinforced
> insulation class plug set is wider than the hot so you can't switch them
> around.
>
> There are two main ways to achieve safety from electric shock in
> equipment design:
>
> 1) Supply the equipment with a ground conductor and bond it to all
> conducting surfaces. I.e. a three wire cordset...
>
> 2) Reinforce the insulation such that it is unlikely to degrade and
> ensure that is used throughout the appliance. Most often this is used
> with non-conducting enclosures etc. This allows the use of a 2 wire
> cordset. SPT-2 cord is the smallest allowed for most appliances. SPT-1
> is only now allowed on lighting products there the wire is pulled into a
> chain or otherwise protected...
>
>
> > When using NA 117v equipment in the UK it is probably best to use a
> > step down ISOLATION transformer, and rewire the 230v equipment
> > mains cord to be compatible with all the other shack eqjuipment.
> >
> Yes it can be a trial to get equipment from around the world to
> co-operate. It's even worse in industry where all of the complexities
> and differences of the grids cause alot of headaches...
>
> 73 Scott
>
>
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