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From: "Phil Allison"
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Tue, 8 Oct 2002 00:23:16 +1000
NNTP-Posting-Date: Tue, 08 Oct 2002 00:11:12 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"N. Thornton" wrote in message
> "Phil Allison" wrote in message
> > ** I am challenging the presumption that adding holes will always
> > that. The unit may become covered up with an item of clothing for
> > They often sit in power boards on the floor - many of mine do.
> That would cause an increase in temp either way, vented or not.
** It reduces the vented unit to no better than unvented.
> > > I can't offhand think of a scenario where a ventilated wall wart would
> > > become dangerous whereas a non vented one would not, in the same
> > > situation.
> > ** A glass of juice spills on it or rain water. The sealed one
> > be easily and safey cleaned - the other cannot.
> True, but looking around me practically none of the electricals here
> are waterproof. Why would a wallwart need to be different?
** You are good at comparing non comparables. A wall wart is a
double insulated safety isolating transformer - so any conductive liquid
inside could bridge that insulation.
Users may clean up the outside and not realise the dangers.
> > > Why would wall warts need to be waterproof?
> > ** Safety - and small object proof too as Tom Faloon seems to
> > The fact is they sit on the floor so often where gravity does its worst.
> Indeed, as do sockets and numerous other things. They are OK, and meet
> all legal requirements.
** They are not at all the same thing or possess the same risks.
> In the UK electricals do not have to be either waterproof or tiny
> object proof. They do need to be touch proof, with specific simulated
> finger test probes. Small holes would easily comply.
** Do you want to use a wall wart that has been drenched in orange
juice and then wiped clean???
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