Answer:

Article 1.4.3 of the Philippine Electrical Code (PEC) states that stairways, ramps, corridors, and other means of egress must be provided with emergency lighting. This is an important safety requirement that helps to ensure that people can safely exit a building in the event of a power outage or other emergency that causes a loss of normal lighting.

Emergency lighting is a backup lighting system that automatically turns on during a power outage or other emergency, providing enough illumination to allow people to safely exit a building. Emergency lighting must meet certain standards, including the duration of the backup power supply and the brightness of the lighting, as specified in the PEC and other relevant regulations.

Stairways, ramps, corridors, and other means of egress are areas where people are likely to be moving during an emergency, so it is especially important that these areas be well-lit. Properly installed and maintained emergency lighting can help to prevent panic and confusion during an emergency, and can significantly reduce the risk of injury or death due to falls, collisions, or other hazards.

Overall, Article 1.4.3 of the PEC emphasizes the importance of emergency lighting as an essential safety feature in buildings, and provides guidelines for ensuring that emergency lighting is installed and maintained properly in stairways, ramps, corridors, and other means of egress.