Files should always be protected from grease, water, or nicks that can make them less effective. When carrying files in a toolbox, it is a good idea to wrap them in a cloth. When storing, try to hang them in a rack or keep them in a drawer with wooden divisions. Keep file teeth clean by using a file card or a wire brush to clear the grooves.
In many houses, the electrical system is grounded to the water service entrance pipe. Since the entire plumbing system is connected to that pipe, be careful not to come into contact with plumbing pipes when you’re working on electrical repair tasks.