Final answer:
Shutting off power for the safety of emergency responders falls under precontact control, which aims to prevent hazardous situations before any contact or incident occurs. It's a proactive safety measure.
Step-by-step explanation:
Shutting off power to protect emergency responders is an action taken as part of precontact control. Precontact control refers to measures taken to prevent harm before an incident occurs. This type of control includes engineering controls, such as the design of facilities and equipment, and safe work practices, such as procedures for handling dangerous substances, to prevent hazardous situations.