K
Kate
Am just curious..What test equipment do you have?Spoon well the critical ones are the Ze tester which I compared last year against the one the DNO chap brought, and the loop tester which is easy to do yourself with a few measured lengths of t&e. Edit: and the IR function which I used some known high value resistors.
The RCD tester is very difficult, and was last done about 5 years ago which was before I bought it, but that's less likely to have lost calibration and also less critical to safety.