Message-ID: <FE49939EE0B04BE1B1EC8986BEE2A453@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
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> <003b01cc8796$3e405770$4001a8c0@lark>
In-Reply-To: <003b01cc8796$3e405770$4001a8c0@lark>
Date: Mon, 10 Oct 2011 23:05:14 +0100
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Subject: Re: LF: mains wires
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Or a  un insulated    10 inch probe   if the  there  is a  chance  of   an 
subsequent  'event'  ....

G

--------------------------------------------------
From: "Alan Melia" <alan.melia@btinternet.com>
Sent: Monday, October 10, 2011 10:47 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: mains wires

>
> 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
>>
>>
>
>
>