Classification of power load in the fine chemical industry

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Our factory operates in the fine chemicals industry. The classification of electrical load levels is described as follows in the preliminary design documents: The electrical load level for this project is determined in accordance with the requirements of the process production needs, as well as the relevant provisions of GB50052-2009 \"Code for Design of Power Supply and Distribution Systems\" and GB50160-2008 \"Fire Protection Design Code for Petrochemical Enterprises\". Fire pump systems, spray pumps, equipment for boosting and stabilizing water pressure in fire extinguishing systems, equipment for boosting and stabilizing water pressure in spray systems, fire exhaust fans, emergency lighting, and fire communication equipment are all classified as Class 1 loads； Some process equipment loads, as well as production-related utility equipment, emergency fans, fire alarm systems, instrument power supplies, etc., are classified as secondary loads, while all others are classified as tertiary loads. I remember that according to the new regulations for gas detection, gas detection systems are considered to be important loads within the first category of loads. Additionally, should emergency lighting, DCS systems, SIS systems, and GDS systems also be classified as important loads within the first category of loads? ； Fire protection equipment (fire pumps and related pumping systems, smoke exhaust systems, emergency fans, fire alarms, etc.) falls under category 1 load ； Our plan: gas detection system, dual power supply + built-in battery ； For emergency lighting, the design institutes currently only plan to draw power from dual-power supply cabinets (should Type A fixtures not come with batteries?) ), does it meet the requirements? DCS, SIS, GDS systems: dual power supplies + UPS, with the UPS being installed separately. Primary load: fire protection equipment; two separate power supplies are obtained from low-voltage cabinets connected to two different external lines and fed into dedicated dual-power supply cabinets. The fire pumps are also equipped with a diesel pump. Secondary load: low-voltage interconnection. Devices with a primary/secondary relationship are connected to two separate external lines. Is the above hierarchical structure and power supply scheme correct? How is grading generally done in practice? What method is used to supply power for loads at various levels?