Probably this is a noob question but i can't find an answer on the web.
I salvaged a transformer from an old radio. I wanted to test it, so i began to wire live to the primary coil and neutral to the other end of the primary. I didn't do anything with the ground wire, should i? I connected my voltmeter to the secondary coil. I plugged it in and... the fuse switched off. The fuse in the meter cupboard, i didn't have any connected to my transformer.