I understand that wiring inside of junction boxes must be accessible.
Are boxes that were under the floor prior to a certain date "grandfathered?" (I'm talking twist, solder, and tape splices from K&T.)
In an attic, for example, can one mount a JB such that with a cover it would be flush with the floor? If it's OK by code, I don't think the usual metal covers (silver colored with the teardrop-type screw hole on one side) would be a good choice here because dust/dirt/etc. can enter. Is there such a thing as a plain plate made for a JB? I have seen 5", white, metal plates but nothing in 4".
Thinkgood, I'm not sure exactly what you are asking but I'll take a stab at it.In general 314.29 2002 nec adresses acessability for j-boxes and conduit bodies. In reguards to covers for j-boxes in an attic, yes attics are usually dusty but a standard cover is usually permissible. Also j-boxes and cables are to be protected from physical damage i.e.stepping on them. I prefer where possible to mount them to a vertical brace if possible to get them off the ceiling joists out of harms way.
#19328 - 12/25/0212:36 AMRe: Accessibility of JBs Question
I reread your post and think that you are asking if say a j-box in a crawlspace or attic that is not up to today's code can you leave it as is? It depends on the locality and if the work you are doing involves said box.If it is sized properly,has a proper cover,annd the splices look good then most ahj's will allow it to stay. If it looks like a rats nest and has no cover you should tell the customer that it is unsafe and should be fixed. Hope this helps.
#19329 - 12/25/0209:39 AMRe: Accessibility of JBs Question
To clarify, if the JB is on the attic floor joists. Thus, if floor boards or plywood were put down, and a plate is over the JB, is that acceptable? Sort of like an in-floor receptacle but instead of that, a blank plate.
#19330 - 12/25/0210:40 PMRe: Accessibility of JBs Question