Firstly Florence, the outputs from your alarm are all low voltage so don't think you'll get electrocuted! The alarm system will have a mains supply, backed up by a battery usually inside the alarm control box. There could be one in the box on the outside wall, too. Cutting wires to the bell box will shut the thing up, but the internal alarm will continue - thats a bit of a drastic measure. Your system will be disabled if you remove the stand by battery and remove the mains supply. However, if you replace the battery with a new one, normal service could well be resumed!
John
June 2008