Three questions regarding leave requests

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1. How should the phrase “Fire protection power distribution main lines should be divided according to fire compartments” be understood? In the same building, divided into two fire compartments A and B, if the centralized power supply for emergency lighting is located in fire compartment A, then the emergency lighting in fire compartment B draws power from this supply. Does this constitute a fire protection distribution main passing through a fire compartment? Or for two buildings that are not far apart, is it possible to use the emergency lighting of one building powered by the centralized power supply of the other building? Since centralized power supplies are not cheap, I think it’s unnecessary for some small buildings to have one installed specifically. 2. Do combustible gas detectors require a bus isolator? 3. When normal ventilation can meet the requirements for emergency ventilation, is it still necessary to interlock it with the combustible gas alarm? Thank you all!