The issue of power supply load

Electricity loads should be classified according to the requirements for power supply reliability and the extent of losses or impacts resulting from power outages in political and economic terms, and shall comply with the following provisions: 1. A load shall be classified as a first-class load under one of the following circumstances: 1. Power outages will cause casualties. 2. Power supply interruption will cause significant political and economic losses. For example: severe damage to major equipment, significant scrapping of products, large-scale rejection of products manufactured from key raw materials, and disruptions to the continuous production processes of key enterprises in the national economy that take a long time to recover. 3. A power outage will disrupt the normal operations of electrical users of significant political and economic importance. For example: important electrical loads in facilities such as key transportation hubs, important communication centers, major hotels, large sports venues, and public places where large numbers of people gather and are used for international events. Among primary loads, those for which a power outage could lead to poisoning, explosions, fires, etc., as well as those in particularly important locations where a power outage is not permissible, should be considered particularly important loads. II. A load shall be classified as a Class II load under one of the following circumstances: 1. When a power outage will cause significant political or economic losses. For example: damage to key equipment, large amounts of products being scrapped, disruptions in the continuous production process that take a long time to resolve, and significant reductions in production volume for key enterprises. 2. A power outage will affect the normal operation of important electricity consumers. For example, important electrical loads in facilities such as transportation hubs and communication centers, as well as important public places with large crowds like large theaters and shopping malls, where a power outage would lead to chaos. III. Those that do not fall under category 1 or category 2 loads should be classified as category 3 loads.

Our load categories are determined by the process requirements. The first-level loads that we encounter include fire pumps and various monitoring instruments (for fires, flammability, toxicity, etc.); the second-level loads include emergency fans and circulating chilled water systems, etc. As long as the process requires that power outages be avoided, a level 2 or level 1 system is chosen; generally, a diesel generator is necessary.

The GB 50052-2009 Code for Design of Power Supply and Distribution Systems explains it clearly; go and take a look.