Fire extinguisher placement in cabinet rooms and control rooms

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In accordance with the GB50140 Code for Design of Fire Extinguisher Installation in Buildings, the fire extinguishers to be installed in cabinets and rooms are as follows: 1. For electrical fires of Class E, ammonium phosphate dry powder fire extinguishers, sodium bicarbonate dry powder fire extinguishers, halon fire extinguishers, or carbon dioxide fire extinguishers should be used; however, carbon dioxide fire extinguishers equipped with metal nozzles shall not be employed. The minimum requirement for fire extinguishers in Class E fire areas should not be lower than those specified for Class A or Class B fires in such areas. 2. Control rooms are classified as being in a high-risk category: they present a high risk of fire, contain many combustible materials, and fires can spread rapidly there; it is difficult to extinguish such fires, which can lead to significant property losses. 3. High and low voltage distribution rooms are classified as being in a medium-risk category: they also have a relatively high fire risk, contain numerous combustible materials, and fires spread quickly there as well; extinguishing fires in these areas is challenging. 4. When using carbon dioxide extinguishers at voltages above 600V, it is necessary to shut off the power first before attempting to extinguish the fire, as high voltages can cause carbon dioxide to become conductive. 5. Minimum requirements for fire extinguishers in Class A fire areas:
Hazard level: Severe hazard, Moderate hazard, Mild hazard
Minimum extinguishing capacity per fire extinguisher: 3A, 2A, 1A
Maximum protected area per fire extinguisher (m2/A): 50, 75, 100

Minimum requirements for fire extinguishers in Class B and C fire areas:
Hazard level: Severe hazard, Moderate hazard, Mild hazard
Minimum extinguishing capacity per fire extinguisher: 89B, 55B, 21B
Maximum protected area per fire extinguisher (m2/B): 0.5, 1.0, 1.5

6. In accordance with the regulations, portable carbon dioxide fire extinguishers of model MT7 with an extinguishing capacity of 55B or higher should be used ； Cart model MTT10, grade 55B or above. Configure a portable dry powder fire extinguisher of the MF/ABC4 model, with a rating of 2A & 55B or higher. Within a single computing unit, there should be one fire extinguisher per 55 square meters, with a minimum of two; the number of fire extinguishers at each installation site should not exceed five.