Solutions to the high ceiling issue that the 'good' electricians here use are 20' length of unistrut, 2-1/2" with a floor flange and a suitable attachment at the truss to support the conduit. A few use RGS, although EMT works.
Dependent on 'what' is being fed, it could be back-to-back strut.
OK, yes they use a strut splice bar, to make the 23' (or whatever) length as required.
Cord drops are usually a twist lock receptacle at the ceiling, 'kellems' , and a pendent box with a receptacle as required. Costco, and Shop Rite use this method for portable refrigeration equipment or displays.
