Shenhai Ho phatloha-Bopaki
Lisebelisoa tsa motlakase tse thibelang ho phatloha li arotsoe ka mefuta e 'meli ho latela tikoloho ea tlhaho ea ts'ebeliso ea tsona ea nnete: enngwe ke ya tshebediso ya morafo le enngwe bakeng sa tshebediso ya feme. Ho itšetlehile ka litšobotsi tsa thepa ea ho hlahisa litlhase, li-arcs tsa motlakase, le mocheso o kotsi, le ho thibela ho chesoa ha metsoako e tukang mollo, they are divided into the following eight types:
1. Mofuta oa Flameproof (marked ‘d’):
This is a type of electrical equipment with an explosion-proof enclosure capable of withstanding the explosive pressure of internal combustible gas compounds and preventing the spread of explosions to surrounding flammable compounds. Suitable for all locations with explosion risk.
2. Keketseho ea Mofuta oa Tšireletseho (marked ‘e’):
Under normal operational conditions, this type of equipment is unlikely to create electric arcs or sparks and will not reach temperatures capable of igniting e ka chang compounds. Its design incorporates multiple safety measures to enhance the level of security and prevent the creation of arcs, litlhase, and high temperatures under normal and recognized load conditions.
3. Mofuta o Sireletsehileng ka Hare (marked ‘ia’, ‘ib’):
Using IEC76-3 lelakabe test equipment, this type ensures that sparks and thermal effects produced under normal operation or specified common faults cannot ignite specified flammable compounds. These devices are categorized into ‘ia’ and ‘ib’ levels based on application areas and safety levels. ‘ia’ level devices will not ignite flammable gases under normal operation, one common fault, or two common faults. ‘ib’ level devices will not ignite flammable gases under normal operation and one common fault.
4. Pressurized Type (marked ‘p’):
This type has a pressurized enclosure that maintains a higher internal pressure of protective gas, like air or inert gas, than the external flammable environment, preventing external compounds from entering the enclosure.
5. Oil-Filled Type (marked ‘U’):
Electrical equipment or parts thereof are immersed in oil to prevent ignition of flammable compounds above the oil level or outside the enclosure. High-voltage oil circuit breakers are an example.
6. Sand-Filled Type (marked ‘q’):
The enclosure is filled with sand to ensure that any electric arcs, dispersed sparks, or excessive temperatures on the enclosure wall or sand surface under certain operating conditions cannot ignite surrounding flammable compounds.
7. Non-Sparking Type (marked ‘n’):
Under normal operating conditions, this type will not ignite surrounding qhoma compounds and typically does not produce common faults with ignition capabilities.
8. Mofuta o Ikgethileng (marked ‘s’):
These are electrical devices with unique explosion-proof measures not falling into any of the aforementioned categories. Ka mohlala, devices filled with stone sand belong to this category.