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Message-ID: <003b01cc8796$3e405770$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <20111009.155855.1944.3.riese-k3djc@juno.com> <002d01cc86eb$6f677730$0401a8c0@xphd97xgq27nyf> <4E92662A.5030406@telus.net> <002101cc872c$6d638050$0401a8c0@xphd97xgq27nyf> <4E9365C1.9010202@telus.net>
Date: Mon, 10 Oct 2011 22:47:27 +0100
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Subject: Re: LF: mains wires
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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" <sthed475@telus.net>
To: <rsgb_lf_group@blacksheep.org>
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
>
>