I may save someone's life with this story. Arrived at service call and found condensor fan spinning slowly. Could be a bad motor/capacitor etc. Go to shut off disconnect at unit, Sumb*tch had none. Compressor not running. Go inside to shut off breaker, lights in house dim and hear this funny whistling noise. Run outside and hear compressor try start, loud whooshing noise, burning smell and then huge cloud of phosgene gas. Compressor had "single phase scenario". One winding broken and touching the housing which made a complete electrical path to ground for the few seconds it took to overamp and blow out the terminals etc. Point being that if I would have touched the condensor I would be dead. Breaker tripped shortly. If you ever see a slow moving condensor fan be careful as these cheap single pole contactors will allow a circuit thru one side and allow this too happen. The double pole are more safe but no one uses them.