Mid-sized civil buildings often consist of basements, podiums and several towers, and contain several fire protection zones. When calculating the heat load, all electrical fire-fighting equipment cannot be blindly included at the same time. The calculation principle is that for projects on a conventional scale, only one fire point must be taken into account (just like for water fire protection). Fires in two or more fire protection zones are generally not considered to occur at the same time. At this point the fire pump should be included as a fixed load. The amount of loads included, such as fire lifts, smoke and exhaust fans, as well as emergency lighting, depends on the actual load put into operation during the fire and is not necessarily . limited to the fire point, to the zonee fire protection in which it is located. Among them, since when a fire occurs in a fire protection zone, the smoke extraction and exhaust fans of adjacent areas can also be activated, therefore it is recommended to additionally take into account this part of the load for safety; emergency lighting generally does not take up much space. In the event of a fire in a building, if the entire building must be evacuated, emergency lighting should also be considered.
The unit of capacity is KVA and the unit of power is kW. Capacity actually refers to apparent power. Generators also have a “reactive” power unit. is VAR (deficient), and there is a Pythagorean relationship between the three.