leito de cabos

14:41 Oct 3, 2014 

right. I´d use both, i.e., "cable trays or raceways, depending on the size of the installation required" in the translation.

14:28 Oct 3, 2014 

Se você pesquisar as fotos vai ver que algumas são bem parecidas. Na verdade, creio que a resposta deveria ser escolhida com base em uma foto no projeto, se houver. E outra coisa, já aparece eletrocalha no texto, que a asker disse estar traduzindo como cable trays. Sugiro raceways para eletrocalhas e cable trays para leitos.

14:24 Oct 3, 2014 

A cable tray is quite wide, perforated with the cables often running openly along/within it, whereas a raceway would be used in a place where appearance is much more important, such as in an office, with the cables being hidden from view.

I would suggest, therefore, that the answer be chosen based on the environment for cable installation. If it's industrial/factory, for example, it's probably a tray, but if it's a building such as an office/store, it's a raceway.

14:19 Oct 3, 2014 

leito de cabos = bandejas para cabos = bandejamentos = cable trays https://www.osha.gov/dts/shib/shib011609.html

canaletas = cable ducts http://www.just-like.net/page/news/cable-ducting-sizes

eletrocalhas = raceways http://rs.quebarato.com.br/tres-passos/eletro-calha-galvaniz...

A diferença entre bandejamento e eletrocalha é bem sutil, mas existe.