5.) 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. Notice should be taken when mounting the fitting in a vertical position. The fitting must be installed with the "bell" end up and the sliding or expanding end below. On one final note, the conduit must meet the securing requirements of the applicable raceway article.