I'm sure it's a combination of all the things mentioned here. I saw a video recently showing Russian workers replacing a xformer and in the LV cabinet there was a 3 phase switch and 3 diazed fuses so looks like they do have LV fuses afer all I can't put a link because the title of the video and the person who put it there was all in Russian language so not a clue what it said. Also the cabinet where the fuses were had a hand painted rating label on much like the one in Siberian odysee posted on this forum ages ago.
