"Larry W4CSC" wrote in message
...
vic wilkinson wrote in
:

to manufacture isolators they must be ce approved & pass many
application tests. They must be able to withstand dc currents (not just
ac currents) & must have heatsinks capable of withstanding high
temperatures for prolonged time (not milliseconds as you state!)


The European Union's Electromagnetic Compatibility (EMC) Directive
89/336/EEC outlines the requirements for electrical apparatus to control
interference by establishing 'essential requirements' for all electrical
goods.

snip

Shouldn't be a problem getting 4 diodes to pass an EMC test that don't
conduct in normal use, eh?

The EMC part is not the problem, you are allowed to test that yourself, if
you have the equipment. But since this device is part of the mains circuit,
other tests will have to be conducted which you are not allowed to do
yourself, you have to hire a notified body for that. And that costs.

Meindert