I have just got hold of a Digitech QM 1493 insulation tester that I intend using for checking cables and electrical equipment at my Menz Shed. It turns out that TAB testing is not a legal requirement for organisations/groups like a Menz Shed in New Zealand, but we thought we'd show willing and play safe. The tester usually sells for $289 on Jaycar, and there is bugger all information on line for it, so I am guessing it is rebranded. I paid just $103 for it on Trademe, and it still had the original batteries wrapped in plastic, and the leads in the sealed plastic bag.
What I'd like to do, is construct a junction box with a mains socket, and 4mm banana sockets so I can hard wire the tester to the box, and plug in the lead being tested, and switch in the test connections (live/neutral, live/earth, neutral/earth) and the whole thing has to be good for the 1000V test voltage without affecting the test results. So I am wondering if anyone has experience with this sort of voltage, and what switches might be suitable? Maximum test current is 1mA.