I always "knew" that holes could be patched by using the same methods and materials as were used in the original construction. For example, you could patch a hole in sheetrock with joint compound- it wasn't necessary to use the red caulk, or any other special product.
The challenge was in documenting what I "knew." Well, I found it....
NEMA, in co-operation with UL, conducted a study that documented this, and other, practices.
"Annular Space Protection of Openings Created by Penetrations of Tubular Steel Conduit- A Review of UL Special Services Investigation File NC546 Project 90NK11659"
This summary, as well as the full report, are available from NEMA.
"Anyone can have an opinion- but DATA is what makes one opinion stand out from the pack!"
