Elektroizolyatsiya va kontakt tarmog'ining elementlarini mustahkamlash uchun mo'ljallangan, 25 kV kuchlanishli elektrlashtirilgan temir yo'llar uchun, atrof-muhit harorati minus 60S dan plus 70S gacha. Iqlim ijrosi va joylashish toifasi UHL1 bo'yicha GOST 15150.
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