Its Really simple
You need to add a tad of Salt to the cooling water - It improves its conductivity - why bother with all those peskey connections - universal connectivity - Computer Scientists have been expousing this for years. PS I can do you a very good deal on a a fire extunguisher - and a Foam tender for that matter - Just post on PPRUNE ten minutes before your next test - Let the National grid know too. Just a courtesy - If the lights dip -I will be sure that you have succeeded - Its the volts that jolt and the amps that cauterise - Good luck (from a safe distance).
CAT III