Liquidtight Flexible Conduits

If you are running single conductors through seal tight this could be a problem.. I believe you can buy aluminium seal tight.. If running single conductors you also must make sure plate that single conductors enter enclosure is of a non-ferrous metal ie aluminum or stainless.. The best installation is to have A, B, & C phase in the same seal tight / conduit, and also enter together through same penetration.. This will prevent the build up of eddy currents..

I have used Sealtite Flexible Conduit to install High Voltage cables from the transformer to the switch-gear. However, as previously stated, you should keep all three phases in the same conduit. I used ALC, ( Aluminum Flex )

The Flex Connectors are rather expensive as the larger sizes of flexible metallic conduit is expensive as well. I used micarta board to terminate the Conduit at the top of the Switchgear. First I secured the Flex conduit to the cable tray carrying the conductors into the switch-station. Then to enter the switchgear, I cut a hole in the micarta template just smaller than the flex. Then I sawed the micarta diagonally through the hole cutting the template in two pieces. I then attached one side of the template to the top of the swgr. Dropping the cables inside the flex down into the switch. Then I took the other piece of the template and tensioned it against the flex. Mark and drill the holes. You can slot the holes in the micarta template to allow for tensioning against the Flex Conduit at the top of the swgr. I was in a water proofed environment. If you are outdoors this will not be a preferred installation. But it is the best I have found for inside a switch station. If you are outdoors and require the use of flexible metallic conduit then you will have to use the Sealtite Terminators. My installation was purely used to isolate and protect the High Voltage Cables.

You might also consider non-metallic liquidtight conduit. There are several manufacturers of both the conduit and matching non-metallic fittings.