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?
On Fri, 01 May 2009 15:01:04 GMT, Geo had this to say:
The tester contains a transformer which provides a low voltage high current supply.
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.
Why 25A when the standard kit for fixed wiring uses 200mA?
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.