LPT : If an ambulance comes to your house, turn off all the lights and appliances

It happened to me a few years ago when my father suffered a heart attack and I called an ambulance. They found out that I had a neutral point in my Main Switchboard not connected to the main ground, and because of it the ambulance's equipment couldn't work. Took me 5 minutes to correct the problem and my father could be saved.<br>I know it's a very specific and not normal situation but it may happen and will make a difference.