Rather than use the original old panel boxes as junction boxes, the electrician created new smaller junction boxes there by starting with a regular metal 4-inch junction box and then stacking one or two 4-inch metal box extenders on top of that to create a larger junction box. And then, of course, there is a metal cover plate.
To be clear, here are 3 photo links showing the basic junction box type that I mean, plus the metal box extender, and the metal cover plate: http://www.grainger.com/Grainger/RACO-Square-Box-5A050?Pid=search
When I look at the newly-created junction boxes, it looks to me like they don't quite fit together too well and there are some visible gaps (maybe 1/16 to 1/8 inch max) between the stacked boxes. I am wondering if that may be considered a problem since theoretically there could be sparks inside the junction box sometime in the future and maybe the box wouldn't fully prevent the sparks from exiting the box.
I, of course, do have a permit and I am about to call for the final inspection. I will be there for the final inspection that will be done by the electrical subcode official.
Here's my question:
If by chance the inspector says the gaps are not acceptable, would it be possible and acceptable to solve that problem by just wrapping the boxes with several layers of metal aluminum tape -- maybe even high temperature aluminum tape? My plan would be to have the metal tape there with me just in case, and if it is okay with the inspector, just wrap the boxes quickly while he is still there so he won't have to come back and re-inspect.
I know it is up to the inspector, but I am just wondering if anyone has ever done this, or if sealing metal junction boxes with metal aluminum tape is ever done and considered acceptable.