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The maximum time for emergency lighting or power to be available in a building is typically set at 10 seconds. This standard pertains to how quickly emergency systems should activate in the event of a power failure, ensuring the safety and accessibility of the building for occupants. The rationale behind this requirement is to minimize the risk of injury and confusion during an emergency situation.

Emergency lighting and power systems are essential for guiding individuals through exits or safe areas in a timely manner, and a delay beyond 10 seconds could significantly increase the risk of accidents or hazards, particularly in large or complex structures. Regulations ensure that buildings maintain a safe environment by providing adequate illumination or power promptly when it is most needed, thereby enhancing the overall emergency preparedness of the facility.

It's important for electricians and building managers to be familiar with these standards to ensure compliance and safety for all building occupants.