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 Usually there is a Electrical department in charge of developing a basic arrangement showing the number, size and route of the different cable trays and a approximate location of the main electric switch boards (coordinated with the rest of equipments). This drawing is sent to the department of Detailed Engineering to develop the cable trays drawings with the rest of the outfitting necessary to build the ship (isometrics, foundations, ducts.)

It is?important when pipes and cable trays go parallel leave at least a minimum access to the cables, or leaving one of the lateral zones free to make easier the mounting of cables.