I had a rotten floor joist on the ground floor , i fixed it by sistering a brand new floor joist right beside it in the basement But when i wanted to instal the beam , i had to cut the wire running through the old joist in order to place the new joist beside the old one Now the wire is too too short ,about 4 inches distance between the tips of the cut wires. And unfortunately no slack in the wire . I thought about using two junction boxes to extend the wires in the ceiling . Is there any better way to do this?? If not, once i put the junction boxes, can I use the cover plate on them and keep it behind a REMOVABLE drywall( i mean a drywall panel that has exposed screws that can easily be removed to expose the junction boxes in the ceiling. Appreciate any thoughts Thanks
2 junction boxes is there best approach. But instead of a removable panel, just get blank covers for the boxes and mount the boxes to the drywall. You also don't have to keep the wires in the same place they are now. You could cut more off and put the boxes farther apart, if that makes disguising the boxes easier.
Drywall screwed in place generally will not count as "accessible". That is both in the strict definition because you need tools to open it up. But also for the very important reason that the next owner might think it is just an unfinished section (e.g., replaced because of water or other damage but never patched/painted) and decide to patch/paint the next time they paint the room. And now it becomes not just inaccessible but hidden.
What you could do is install a plywood (or other material) door with a small handle, like an access panel for an attic or for plumbing. Not quite as smooth as drywall, but if all painted the same color and done well, it may not be that noticeable.
A while ago I had to replace a bathroom fan. Of course one the same dimensions was not avialable.
So I went to Habitat for Humanities 'Re-Store' and bought a square kitchen cabinet door. Cut a hole in it to mount the fan, and attached the door to my ceiling with 4 brass screws.
I did a similar trick in my shower to provide ready access to the plumbing from the other side of the shower wall.
You can do the same with doors, or with plaster medallions. Use enough wire that you can make a pattern of the the spots. Paint can make them less obvious or you can make them blatant by making them contrasting colours.
If it won't quite make a pattern, you can add a door or two that don't include a junction box, or include one that is empty.
Evidently some jurisdictions allow these repair splices for non metallic cable repair to be hidden inside walls. I think this is questionable, but you could investigate it as an alternative to ceiling boxes. However it does not appear it would bridge 4 inches.
I assume this cable is copper conductor, probably this repair splice is only approved for copper.
Personally, I would use boxes and metal covers which can be painted to match the ceiling.