John,Interesting. I suspect that is far from common practice.
As I said, traditional JBs do not have any provision for 'cable clamping'. However, I personally find J803/804s somewhat of a pain to use (more time-consuming than conventional JBs) because it is (at least for me) very difficult to push the conductors into the connectors with the cable going through the clamp. I therefore nearly always have to completely undo and remove one of the screws on each clamp so that i can 'swing it out of the way' - and then 'put it back' again.
Am I the only person to have that 'problem'?
Kind Regards, John
I cut all the relevant insulation back, cut the length of sleeving and dress the cable with a small service loop on each conductor before I clamp the cable down. I guess I've got a knack for it now.