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This one is for the American / Canadian members, I worked the Both countries and could never get my head around the difference between Conduit, Trunking and cable tray, the Guy I worked with called it Raceway can anyone explain the differences?
 

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Here is the NEC definition of Raceway. I would not call a cable tray a raceway although it technically does exactly that but are generally not enclosed.

I don't know what trunking is as I never heard of it.

Raceway. An enclosed channel of metallic or nonmetallic
materials designed expressly for holding wires, cables, or busbars,
with additional functions as permitted in this Code.

In telecommunications trunking refers to the grouping of connection switches and circuits within a telephone exchange. Trunking is a process that enables the service provider to use fewer circuits because users are sharing connections.
 
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