I have an opportunity to record a number of Tesla coils. To put it shortly, would you have any advice as to how to make sure I do not electrocute myself or my equipment? I intend to bring my DR680 recorder, a Rode NTG-3, and perhaps also a NT1a and NT4 (NT4 cause it can handle 143dB SPL). I'll probably throw in the ol' Zoom H2 as well. I was also thinking of maybe buying a cheap dynamic mic like a SM57 or 58 and place that fairly near a tesla coil, using a long cable... As long as I can avoid a spark from the tesla hitting the mic and then having the current travel through the cable and kill my recorder. I can lose a cheap mic but the recorder would be painful.
Another thought is to only run the recorder off batteries, as it may be a bit safer. No plugging into the mains outlets (this is all going to be indoor so that would be theoretically possible).
I've never recorded anything electric / sparking / arcing ... Well apart from a bug zapper after reading that post on Chuck Russom's blog. Clearly there's some risks involved. But I'd like to get as close as possible (or at least get microphones as close as I can) and get hopefully some unique material.
Any tips would be much appreciated!