An Emergency Power Off (EPO) button, also known as an EPO switch or EPO panel, is a critical safety device designed to quickly disconnect electrical power to equipment or even entire facilities during emergencies. This ensures a swift and safe shutdown of all power sources, which include uninterruptible power supplies, batteries, and generators from a central location.
EPO buttons are designed for use in situations where there is a potential for loss of life or substantial property damage. These scenarios include:
EPO buttons are typically installed in various high-risk environments such as:
A centralized power shutdown via an EPO button significantly reduces the potential damage during disasters. It stops electrical fires from spreading and minimizes the risk to equipment and infrastructure.
Activating an EPO button allows safer conditions for emergency personnel who need to handle the situation, whether they are dealing with fire, water, or electrical hazards.
To ensure the efficacy and prevent accidental activation, EPO buttons should be:
Accidentally pressing the EPO button can have significant negative implications, such as:
The specific requirements for the size, placement, and accessibility of EPO buttons vary by jurisdiction. Historically, codes required EPO buttons at every exit door. However, the 2011 National Electrical Code (NEC) allows a single EPO switch placement in a nearby room, given approval from a code inspector and fire marshal.
EPO buttons may be interconnected and managed from a central point. They often tie into fire panels or building control systems to automatically activate an EPO before activating fire sprinklers, minimizing the risk of electric shock.
There are several suppliers for EPO buttons, including well-known companies like:
