There was a topic which came up at our last night at our dept. meeting about what should be done at an electrical fire. The question I need an answer to is... Taking into account length and diameter of hose(creating friction loss) which nozzle, hose stream and distance away would not allow the electricity to jump through the water droplets back to the nozzle. We use f-500 at 3% on some fires and our pump runs at 125psi with a preconnect 200 feet of 1and 3/4 inch hose with a 1 and 1/2 fog nozzle that maxes out at 100psi.
I live in Canada but the town is old and some older homes have been fixed over several years. We use f-500 not foam in our pump it is not the same. I agree with everyone, back off and wait until the power is off.