I think it may have to do more with the UL listing of the 1900. I have heard that the commonly made up 1900 box extension cordsets seen on every construction job are a no-no, besides the fact they typically lack the GFI protection.
How about mounting an FS box on the end of the cable?
#75880 - 03/15/0710:44 AMRe: intended use of 4" sq. box
Although I hate cord drops, I think that the idea of pushing out the KOs is weak. If that were the case, wouldn't it be a problem with the boxes mounted on the wall as well? The 4-S boxes are meant to be secured. Any of the other ways the guys have shown here are better.
#75885 - 03/15/0709:47 PMRe: intended use of 4" sq. box
I did think there was some sort of OSHA prohibition on making extention cords and the like with a 4S used on sites for temporary power. Not an NEC thing, but I think they might have something in the OSHA stuff? Anyone seen a wording for it?
Mark Heller "Well - I oughta....." -Jackie Gleason