What is a dedicated emergency circuit for fire protection power supply?
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Technical Standard for Fire Emergency Lighting and Evacuation Signaling Systems GB51309-2018 3.8 Design of backup lighting 3.8.2 The design of the backup lighting system shall comply with the following provisions: 1 Backup lighting fixtures can be those used for normal lighting; they should maintain a proper level of illumination in case of a fire； 2 The backup lighting fixtures should be powered by a switch between the normal lighting power supply and a dedicated emergency circuit for the fire protection power supply. What does this dedicated emergency circuit for fire power supply mean, and how should it be configured?
It is usually a diesel generator. . . .
Can a UPS be used as well? Or would a dual-power supply cabinet work? The entire plant won’t lose power even in the event of an accident...
The whole area lost power; fire pump systems consume a significant amount of electricity. . . . UPS probably won’t work. We all use dual power supply switching, along with diesel generators, to ensure reliability
By this I mean backup lighting, with a low power output. In the event of an accident at the factory, the fire protection power supply will not be turned off. All the fire protection equipment in our factory is classified as belonging to category II load, so dual power supplies are sufficient. The probability of an entire plant losing power is already very low; if that happens and a safety accident occurs at the same time... well, that would be really bad luck. Our plant still has diesel pumps:D
There should be no non-fire protection loads on this circuit; generators and EPS are acceptable
A separate transformer? Or is a separate circuit sufficient?
A single circuit is sufficient. But I would like to ask, does your fire emergency circuit also pass through a transformer? It is generally powered by generators, EPS, and UPS
It seems that our company has installed a dual-power supply cabinet for the fire protection equipment (pump room). The combustible gas equipment is equipped with its own batteries, while both emergency lighting and regular lighting systems use dual power supplies (both powered by regular electricity from transformers)
They come from two separate transformers, and is the factory equipped with dual power supply inputs?
Right. Two outer lines, with two transformers each connected to one of these lines