If a cord is permanently wired, is it an extension cord? I don't think so. Are pendants not allowed? Why can't receptacles be installed on the lab stations?
There are lots of good reasons to use a pendant rather than a desk top receptacle. Maybe the equipment cannot be fixed in place, the trucks would break a floor plug. No wall to install a receptacle.
I assume the NEC has rules governing the use of pendant receptacles which are not considered to be extension cords as 1 end is hard wired. CEC answer in an NEC forum.