I don't have a PA tester but wonder how the 25A for the class 1 appliance earth
test is generated. Does it has to be on for suffient time to blow the single
remaining strand of copper or just long enough for a single voltage sample to be
taken?
What is the source?

--
Geo

On Fri, 01 May 2009 15:01:04 GMT, Geo had
this to say:

I don't have a PA tester but wonder how the 25A for the class 1 appliance earth
test is generated. Does it has to be on for suffient time to blow the single
remaining strand of copper or just long enough for a single voltage sample to be
taken?
What is the source?

The tester contains a transformer which provides a low voltage high
current supply.

--
Frank Erskine

Geo wrote:

I don't have a PA tester but wonder how the 25A for the class 1 appliance earth
test is generated. Does it has to be on for suffient time to blow the single
remaining strand of copper or just long enough for a single voltage sample to be
taken?
What is the source?

--
Geo

I did one for an automated product tester. Ended up with (ISTR)
testing with 40Amps for about 4 seconds, with voltage being measured
continuously. Yes, those remaining copper strands do happen
surprisingly often and burn out within the first second, (cue process
improvements!). Power came from a normal 100W mains transformer. It's
12V secondary winding cut off and a couple of turns of 10mm^2 wound
on in it's place.