Oh Joy, another electric problem

jimo wrote:
Pulled into my sister's driveway that has a 50 amp plug. We have camped there for many years during Christmas and everything has been fine. I have to use an 50 amp extension that attaches to our power cord on our Zephyr. Everything worked just fine for a couple of hours and then the power was gone. Tried again and the 40 amp fuse on their home kept breaking. It still is tripping. Purchased a new 50 amp extension cord and everything is still tripping. When unplugged the coach works just fine on the generator. My best guess is the short is in the power cord since when I turned off all of the switches in the coach the breaker kept tripping. Any of you pros out there have a suggestion?

Lets keep it simple. You have a 40 amp breaker supplying a 50 amp RV. 50 amp RV service is REALLY 2 50 amp breakers for a total of 100 amp available service. You have 60 amps LESS than the coach is designed for. EACH AC (or Heat Pump if you are in cold weather) will pull anywhere from 14 to 16 amps EACH. A Zephyr has 3 HP units. So, if you are running all 3 HP units, you are OVER the 40 amp for the circuit supply breaker by 2 amps. This does NOT take into account the Refer/the Inverter/charger/ or any other 120 appliances you may be running. If you have a Zephyr and have either a Furnace or Aquahot system (deopending on how old your RV is) run the furnace/ Aqua hot if you need heat. If you are in a warm climate and need AC, then you have no choice other than running just 2 of the 3 units. Doug