16 Feb
2006
16 Feb
'06
1:11 p.m.
----- Original Message -----
From: "Chuck Guzis" <cclist at sydex.com>
To: <cctalk at classiccmp.org>
Sent: Thursday, February 16, 2006 1:27 AM
Subject: Re: Repairing wall warts
On 2/16/2006 at 12:27 AM ard at p850ug1.demon.co.uk
wrote:
to
Very few wall-wears (at least the ones sold over
here) contain fuses any
more. The transformer is designed to burn out in a safe way if
overloaded, or so I am told -- personal experience suggests it does not
do so before the case has started to melt and smoke is coming out!
That's pretty surprising to me, considering that most UK appliances seem have a fuse in the mains plug (almost every one
I've seen has been 13A,
yet
I KNOW other values are sold). Over here, consumer
electronics are
usually
fused, but appliances are not, depending on the 15 or
20A distribution
panel breaker to trip.
The NEC wart that I just opened has a microfuse in the DC output.
Somehow,
I'd expected to see a fuse in the transformer
primary. It seems to me
that
the fuse as is may protect the attached equipment, but
if the transformer
developed a short in the windings, the thing would turn to slag before
opening the circuit.
Cheers,
Chuck
A lot of the ones I've seen recently have a thermal fuse on top of the
primary winding.
Geoff.