Portlashdan himoyalangan elektr jihozlarining harorat guruhi nima

Harorat tasnifi yonuvchan gazlar va portlashdan himoyalangan elektr jihozlarining yonish qobiliyatini baholash uchun muhim xavfsizlik ko'rsatkichi bo'lib xizmat qiladi.. Yonuvchan gazlar yonish haroratiga ko'ra oltita sinfga bo'linadi, elektr jihozlari esa maksimal sirt haroratiga ko'ra olti toifaga bo'linadi, T1 sifatida belgilanadi, T2, T3, T4, T5, va T6. Biroq, the grouping criteria for electrical equipment and flammable gases are distinctly different.

Temperature Group	Igniting Temperature Of Combustible Gas/℃	Equipment High Surface Temperature T/℃
T1	t≥450	450≥t＞300
T2	450＞t≥300	300≥t＞200
T3	300＞t≥200	200≥t＞135
T4	200＞t≥135	135≥t＞100
T5	135＞t≥100	100≥t＞85
T6	100＞t≥85	85≥t

The principle behind electrical equipment’s harorat classification is that the highest surface temperature generated by the equipment should not ignite surrounding flammable gases. Boshqa so'zlar bilan aytganda, the equipment’s maximum surface temperature must not exceed the ignition temperature of the yonuvchan gazlar.

It is important to note that the maximum surface temperature of portlashdan himoyalangan elektr jihozlari refers to the highest temperature that can be reached on its surface or parts under normal working conditions and under the most adverse conditions approved. This temperature should be capable of igniting the surrounding portlovchi gas-air mixture.

Due to varying explosion-proof designs, the maximum surface temperature could refer to different parts of the equipment. It might be the temperature on the outer surface of the enclosure, as in the case of flameproof electrical equipment, or it could be the temperature on the external surface of the equipment casing or certain internal components, such as in xavfsizlikni oshirdi or pressurized electrical equipment.