6.) The improper installation and securing of expansion fittings in runs of Rigid Non-Metallic (PVC) Conduit.
Section 110.3 (B) requires that listed or labeled products be installed in accordance with their listing or labeling. Quite often when the expansion fitting, mentioned in items #3 and #5, is installed it is secured on the wrong end. The manufacturer’s listing requires that the expansion fitting be secured on the "bell" (fixed) end. If they must be installed in a vertical application, the open end must be securely fastened in the down position. This will minimize the infiltration of foreign material into the fitting.