5.) The improper 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 item #4, is installed it is secured on the wrong end. The manufacturers listing requires that the expansion fitting be secured on the "bell" (fixed) end.