TOWERS

• Safety belts or harnesses should be used prevent injury from falling when climbing high towers.  A lanyard should always be connected from the fall restraint to the tower at any distance over 6 feet above the ground. 
• If you are assisting the person working on the tower, then you should be wearing a hard-hat and safety glasses to prevent injury from falling objects. 

ERECTING ANTENNAS

• If a bow or sling is used to project an antenna end over a structure, ensure that there is nothing or no one in its path that can be damaged.
• Make sure that all antennas are well clear of power lines.

ELECTRICITY

• Unless otherwise certain, assume any circuit or connection to be "live".  In the past, you may remember a couple of Abbott-and-Costello types use the following phrase during a comedy routine: "it's not the voltage that gets you, it's the amps".  It's true.  As little as 1/500 of an amp can yield a painful shock; and just 1/10 of an amp can kill you dead by throwing your heart into a tizzy.  The voltage that can do you harm is 30 volts.
• Make sure that everyone in your home knows where the electrical box is and that they can shut down a circuit in case there is an accident and you can't do it yourself. 
• Avoid leaning over a power supply when you have loose jewelry or other conductive items on your person.
• Keep your head if you discover somebody being shocked or burned by electricity - don't touch them to help them out.  You may end up getting shocked yourself, and that could result in a double fatality.  Turn off the power, call for help, and conduct CPR if needed.

GENERAL ELECTRICAL INSTALLATION TIPS

• Always follow the recommendations of the National Electrical Code when installing wiring and setting up antennas.
• Install main power switches so that they may easily be seen by all in case of an accident.
• When installing a mobile rig, a faceshield and gloves are recommended when connecting wiring under the hood in case of a battery explosion.