Eliminate need for adding sealing fittings and compound at each conduit entranceSelector switch contacts are silver cadmium oxide which are sealed in lower phenolic chamber isolated from corrosive elementsAssures positive contact and long, trouble free operationProvide circuit control and/or selectionEFD/EFDB and EDS factory sealed control stations confine arcing of device within the enclosure, preventing ignition of ignitable atmospheres during control operation of motors and other equipment