If you have a damaged cable that runs from your reflector to your ballast, you should turn it off and change it immediately with one of these Reflector Cables that has an IEC connection already fitted to plug it directly into your ballast.
The Reflector Cable is four metres long and it can easily be wired to your ceramic lamp holder on your reflector. The live and neutral are fitted into terminals in the ceramic lamp holder and the earth wire should be connected directly to your reflector. If you are in any doubt you should consult a qualified electrician first.