The Cyber-Spy.Com Usenet Archive Feeds Directly From The Open And Publicly Available Newsgroup Sci.Electronics.Design
This Group And Thousands Of Others Are Available On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic, Opinions Or Content Posted To This Or Any Other Newsgroup. This Web Archive Of The Newsgroup And Posts Are For Informational Purposes Only.
From: "Phil Allison"
Newsgroups: sci.electronics.design
References: <5o4o9.47535$g9.136534@newsfeeds.bigpond.com>
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Message-ID: <4Cgo9.48095$g9.137554@newsfeeds.bigpond.com>
Date: Tue, 8 Oct 2002 00:23:16 +1000
NNTP-Posting-Host: 144.139.145.27
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
news:a7076635.0210070419.4be032da@posting.google.com...
> "Phil Allison" wrote in message
news:<5o4o9.47535$g9.136534@newsfeeds.bigpond.com>...
>
>
> > ** I am challenging the presumption that adding holes will always
do
> > that. The unit may become covered up with an item of clothing for
example.
> > 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
can
> > 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
agree.
> > 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???
Regards, Phil
Go Back To The Cyber-Spy.Com Usenet Web Archive Index Of The sci.electronics.design Newsgroup
|