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Message from discussion Tingles from DVD players
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Phil Allison  
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 More options Mar 22 2006, 8:28 pm
Newsgroups: aus.electronics
From: "Phil Allison" <philalli...@tpg.com.au>
Date: Thu, 23 Mar 2006 12:28:01 +1100
Local: Wed, Mar 22 2006 8:28 pm
Subject: Re: Tingles from DVD players
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"Chris Jones"

>> In countries with 240 volt AC power, this is a FATAL  accident scenario
>> !!!!

> Ok, I can see that wiring the plug of the class 1 device wrongly has made
> the class 1 device as well as the class 2 device dangerous to touch.

** Not just one device, but an entire hi-fi system INCLUDING the damn
speakers !!!

> I
> think that the user was pretty much asking for a jolt whether or not the
> class 2 device was connected (or even existed at all),

**  A third party could be the one electrocuted -  maybe a small child.

> but in principle I
> see why the manufacturer of the class 2 device would not want the two
> devices interconnected, so the user gets electrocuted whilst touching the
> device made by someone else, that would be cheaper in court....

** The makers of the class 2 devices are not liable in such a case.

Their items are not permitted to be connected to the earth system of
another.

> The root cause of the problem is of course having someone who thinks they
> can wire a plug but cannot.

**  Millions of them around.

 Heaps of places sell 3 pin plugs to the public.

> The problem is they might not be the one to
> get killed, it'll be the neighbour's kid or something like that.

** The punishment for mis-wiring a plug ought not be the death of anyone.

>> NOTE:

>> One of the BIGGEST  user safety advantages of class 2 construction is
>> that
>> no matter how WRONGLY the AC plug is wired & no matter what is wrong with
>> the AC outlet,  you cannot get active onto the earth of the gear.

> Thanks, that's the first "class 2 is safer" argument that makes sense to
> me.
> In the context of incompetent and/or amateur electricians, no ELCB, and no
> regular testing of power socket wiring and portable appliance testing, I
> can see that advantage of class 2.  Those conditions are probably fairly
> common too.

** The most common cause of electrocution in the home is ( or was until
recently)  incorrectly wired plugs and extension leads.

The worst electrocution trap in where BOTH miswired but BOTH work OK unless
the two meet up.

1.  The extension lead has active and neutral wires reversed,  earth is
wired OK ( most consider this to be harmless).

2.  The appliance has earth and neutral wires reversed, active is on the
correct pin ( appliance works fine in normal outlet).

When appliance "2"  meets lead  " 1"  ?????

Death to a toddler.

.......  Phil


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