My situation is similar to many I read about on this forum... an older home, wired without ground wires or modern stuff, that needs to be brought up to present standards. In particular, my house was built in 1951, wired with 1950's romex, generally 12/2.
I would like to replace the whole mess, one because I would like it to be grounded, and two because while most of it is OK, there are lots of boxes left open (too full), connections made outside of boxes, soldered wires, and an occasional piece of 14/2 spliced in. I have rewired other houses that I lived in before, but it has been awhile, and I am not familiar with whats available now and current code.
I have worked on a few outlets already. I can't use the old wire to pull new wire in its place as it is well stapled to the studs along the way. I have been cutting off the old wire and removing the old boxes and replacing them with new old work boxes, connected with 12/2 wg NM cable and making all the connections in junction boxes in the attic. Below are some question about things I am not sure about:
- I am using Carlon plastic ceiling fixture boxes with lids as junction boxes in the attic. They are 20.5 cu in, which I think means I can fit 4 12/2 cables into the box. Correct ?
- Is there any approved method of splicing 2 cables together without a box ? I saw something used on the TOH show when they were building the prefab timber frame house/barn to connect wall sections together, but it was not discussed.
- There is a rule that plastic wall/device boxes do not require a wire clamp if the wire is stapled within 8” or so of the box. I assume this does not apply to my attic plastic junction boxes, and I will need some kind of clamp where the wires enter the box. I have found a plastic snap in clamp rated for 2 cables in a 1/2” knockout, but want to make sure it does not decrease the wire capacity of the box. Is a clamp required and do these plastic clamps decrease the capacity ?
- I assume there is no requirements at all to support the wire inside wall cavities where I have fished the wire into the wall. Clamp it at the box and staple it in the attic close to the hole and that is good enough. Correct ?
- I am concerned about burying all the attic junction boxes that I put in with insulation. For now I am attaching them to vertical supports or to rafters so that they will be above the level of the insulation that I will add after this is done. That will make them “visible” after the insulation, but accessible only with difficulty. Is that required ?
- I am adding some new outlets where I need them, but not trying to meet the 6 foot rule where it does not seem needed (I have some outlets that are just a litte bit more then 4 feet from a door, and if I added a new one the old and the new would be quite close.) Am I required to do more ? At what point do I have to meet new code on the whole house ?
Thanks in advance..