Attention should be given to the message that it needs to be clear communication on the scene, such as "Do not turn off power supplies if it is open. If closed, do not open " .
Should be assigned to a message should also be aware of the need to communicate when the incident occurred, clear, such as "electrical equipment if turned on, do not turn off if it is closed, not open" .
Be sure to set a message to be careful to use in the event of a communication, for example, if open, do not turn off electrical equipment is turned off if you do not turn on "