Re: More elecrical controversy
- From: Gibbo <gibbo@xxxxxxxxxxxxxxxx>
- Date: Wed, 05 Jul 2006 09:22:15 +0100
Simon Dawson wrote:
One question please.
How can a non electrician recognise what equipment has a "switch mode power supply"?
That's not an easy one. But a rule of thumb (if the power supply is separate) is that a switch mode supply will weigh less than 1kg per 100 watts. Probably substantially less. A non switch mode will weigh substantially more than this. This is not infallible but it will be right nine times out of ten. Note that this is for the power supply only.
If the PSU is built inside the equipment there's no easy way other than knowing about the stuff and taking it apart to have look. Unless of course the entire equipment weighs less than 1kg per 100 watts. This is quite likely with a lot of modern equipment.
Whilst we are on the subject - how can a non specialist electrician test Galvanic Isolators? What I do about is measure the voltage across it and normally get about 0.5 volts, so it's not short circuit. And then plug one of those RCD testers into a socket onboard and press the button and see if the RCD trips (and it seems to be random whether its the onboard RCD or the shore supply RCD that goes). Is that an adequate test?
That will test the galvanic isolator is not faulty.
It will not test whether it's purpose is being negated by the actions of AC currents/voltage from switch mode power supplies and such like. That test is far more complicated.
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Gibbo
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