I purchased some ceiling fans to install at home. The sort I bought include a light and are controlled by remote control, I chose these because the salesman told me they are easy to install and simply replace the existing light fitting. The instructions say they need to be wired through an isolation switch (the light switch?) and three wires, active, neutral and earth. The wire running to the lights is obviously two strand with no earth. Is it possible to leave the earth wire off or do I need to get power run through the ceiling to each fan (so much for a simple self installation).