Message-ID: <4E9365C1.9010202@telus.net>
Date: Mon, 10 Oct 2011 14:38:09 -0700
From: Scott Tilley <sthed475@telus.net>
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Subject: Re: LF: mains wires
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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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    On 10/10/2011 1:19 AM, mal hamilton wrote:
    <blockquote cite="mid:002101cc872c$6d638050$0401a8c0@xphd97xgq27nyf"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
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      <div><font face="Arial">Tnx Scott and others for the info. Your
          system is more complicated because of the 117 v and 230v dual
          supply required.</font></div>
      <div><font face="Arial">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. &nbsp;In EU their 2 pin plug is also reversible but does
          have an earth. </font></div>
    </blockquote>
    There is a conformity here too.&nbsp; Just different!<br>
    <br>
    Ours is non-reversible as well.&nbsp; The neutral blade on a reinforced
    insulation class plug set is wider than the hot so you can't switch
    them around.<br>
    <br>
    There are two main ways to achieve safety from electric shock in
    equipment design:<br>
    <br>
    1) Supply the equipment with a ground conductor and bond it to all
    conducting surfaces.&nbsp; I.e. a three wire cordset...<br>
    <br>
    2) Reinforce the insulation such that it is unlikely to degrade and
    ensure that is used throughout the appliance.&nbsp; Most often this is
    used with non-conducting enclosures etc.&nbsp; This allows the use of a 2
    wire cordset.&nbsp; SPT-2 cord is the smallest allowed for most
    appliances.&nbsp; SPT-1 is only now allowed on lighting products there
    the wire is pulled into a chain or otherwise protected...<br>
    <br>
    <br>
    <blockquote cite="mid:002101cc872c$6d638050$0401a8c0@xphd97xgq27nyf"
      type="cite">
      <div><font face="Arial">When using NA 117v &nbsp;equipment in the UK it
          is probably best to use a step down&nbsp;ISOLATION
          &nbsp;transformer,&nbsp;and &nbsp;rewire the 230v equipment &nbsp;mains cord to be
          compatible with all the other shack eqjuipment.</font></div>
      <br>
    </blockquote>
    Yes it can be a trial to get equipment from around the world to
    co-operate.&nbsp; It's even worse in industry where all of the
    complexities and differences of the grids cause alot of headaches...<br>
    <br>
    73 Scott<br>
    <br>
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