I'm wondering if there are any exceptions to buring a junction box behind drywall, no access? i.e. are there any products or devices or means (crimping, welding etc)to allow one to make a permanant splice connection and then not have to leave the j-box accessable? This particular situation is around a residential application.
Tyco has a similar item. Last debate here (NJ) was mobile/mod structures. Based on your location, I would suggest that you show the literature from the above link to your area AHJ BEFORE you do it.
My personal opinion....'buried' splices are NG, as Ed said. BTW, HD probably doesn't stock Molex. As an EC I would replace/rewire/re-feed whatever you are referencing to splice. As an AHJ....buried splices win a red sticker; but a future problem may 'win' you a lot more than that.
Ed, what product are you linking to? I'm alittle dense so please excuse my required hand holding. I opened your link, but it goes to the molex home page...i.e. I do not know what product you refering. Can you please give me a name to look for on the Molex site?
Molex does not seem to be bragging about "concealed" like the Tyco product. Tyco was saying their splice could exploit 334.40(B)
Devices of Insulating Material. Switch, outlet, and tap devices of insulating material shall be permitted to be used without boxes in exposed cable wiring and for rewiring in existing buildings where the cable is concealed and fished. Openings in such devices shall form a close fit around the outer covering of the cable, and the device shall fully enclose the part of the cable from which any part of the covering has been removed. Where connections to conductors are by binding-screw terminals, there shall be available as many terminals as conductors.
someone should manufacture a "in-wall splice kit" that is just like an underground splice kit. send it in to UL to have it listed for the purpose. I personally would feel way better with a pressure torqued terminal shrink tubed, than I would with a "stab" connection. just thinking out loud...
I don't think that the issue is so much with the ability of a product to make a good, long lasting connection that could be covered and work well for the life of the building and other wiring when properly installed, I think it's the inability to check the quality of the installers work after said splice is buried. Once a device like this is allowed on the market, anybody will be able to get them, and we've all seen the horror of DIYers in action. A badly made splice out of the confines of a box is a fire waiting to happen.