Tsawg voltage spool porcelain insulatorLub spool insulator yog nruab nrog ntau tshaj ob lub kaus tsev.Tus neeg xyuas pib yog khi rau hauv nruab nrab ntawm lub tsev sab sauv thiab sab qis, thiab qhov chaw yog perforated.Nws yog fixedly txuas nrog tus ntoo khaub lig caj npab los yog splint nrog threading rau tes.