Much has changed in Bulgaria since the fall of the Iron Curtain, but corruption and organized crime persist, according to a July 2007 cable from the U. S. Embassy in Sofia.
Remark One or two singal-core cable not allowed laying in iron pipe.
一根或二根单芯电缆不允许敷设在铁质管道中。
3
The zero sequence current transformer is full enclosed type. The secondary windings and iron core are insulated by epoxy resin. The middle hole is used for cable going through.