Trough
2.1.11. A channel is an open structure intended for laying wires and cables on it.
A channel does not provide protection against external mechanical damage to wires and cables laid on it. Channels shall be manufactured from non-combustible materials. They may be solid, perforated or grating. Channels may be used in rooms and outdoor installations
Source: "Rules for the Installation of Electrical Installations (PUE). Sixth Edition" (approved by Chief Engineering Administration, State Energy Inspectorate of the Ministry of Energy of the USSR 05.10.1979) (revision dated 20.06.2003)