Re: Conduit in the bridge
If the conduit is actually encased in the concrete, the raceway type doesn't matter. Assuming the bridge is long enough to have expansion joints, you will need expansion joints in whatever raceway you use that will be able to move as much as the bridge is designed to move. I would think you would want to use IMC or RMC (the raceway will be exposed to pedestrians at the expansion joints) for the raceway and that you would be talking to the engineering company to see what the planed movement is for that bridge.
If there are no expansion joints in the bridge, there is no need for any expansion joints in your raceway.
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