Installing electrical flex conduits in a Waste Water Treatment Plant headworks will be in a corrisive environment and will require the materials to be resistive corrosion from the sewage gases and dampness.
Which type of flex conduits and connector material would be best used?
I agree Liquid tight Flexible Metal Conduit is a pretty good choice and it is listed for class 1 locations if your AHJ decides that is what you have. Some say the methane constitutes an explosion hazard.
It was pretty common to see LFMC and the appropriate fittings in sewer lift stations. Whether you had to apply 501 rules depended on how well it was ventilated. Usually we did see seal offs at the inputs to above ground controller cabinets.
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