Encyclopedia
Trolls
Trolley: a combination of conductive wire and supporting structures intended for transmitting electrical energy to movable mechanisms moving along the trolley, as well as in some cases for supporting these mechanisms or their parts
Source: "SP 43.13330.2012. Code of Rules. Industrial Facilities Structures. Updated Edition of SNiP 2.09.03-85"
(approved by Order of the Ministry of Regional Development of Russia dated December 29, 2011 No. 620)