Though telephone lines contain a low level of current, precautions should still be taken when working with it.

* Never work on a phone line before deactivating it. It requires a higher level of current to make a phone ring; should you get an incoming call while working on the line, it could cause a nasty shock.

Simply removing the handset will avoid such an occurrence. Should your phone have a lighted dial, look for the source of power, usually a small transformer, and unplug it.

* Always hold the insulated part of wires, and, for extra protection, use insulated tools.

* Check the weather forecast. Lightning can send a hazardous surge down the telephone line.

* If you have a pacemaker or a defibrillator, call in a pro to work on your telephone wiring.