To avoid contact with electrical current:
Never install electrical wiring during an electrical storm.
Never install telephone jacks in wet locations unless that jack is specifically designed for wet locations.
Use caution when installing or modifying telephone lines.
Use a screwdriver and other tools with insulated handles.
You and those around you should wear safety glasses or goggles.
Do not place telephone wiring or connections in any conduit, outlet or junction box containing electrical wiring.
WARNING: Do not work on your telephone wiring if you wear a pacemaker. Telephone lines carry electrical current.
Installation of inside wire may bring you close to electrical wire, conduit, terminals and other electrical facilities. Extreme caution must be used to avoid electrical shock from such facilities. You must avoid contact with all such facilities.
Telephone wiring must be at least 6 feet from bare power wiring or lightning rods and associated wires, and at least 6 inches from other wire (antenna wires, doorbell wires, wires from transformers to neon signs), steam or hot water pipes, and heating ducts.
Before working with existing inside wiring, check all electrical outlets for a square telephone dial light transformer and unplug it from the electrical outlet. Failure to unplug all telephone transformers can cause electrical shock.
Do not place a jack where it would allow a person to use the telephone while in a bathtub, shower, swimming pool, or similar hazardous location.
Protectors and grounding wire placed by the service provider must not be connected to, removed, or modified by the customer.
CAUTION: Do not touch uninsulated telephone wiring if lightning is likely.
IMPORTANT: Any external communications wiring you may install needs to be constructed to all relevant electrical codes. In the United States, this is the National Electrical Code Article 800. Contact a licensed electrician for details.