What's Wrong Here?

May 21, 2009 2:30 PM, By Joe Tedesco, NEC Columnist

Hint: Sunstroke conduit

The lack of a proper expansion fitting in this exposed run of rigid nonmetallic conduit led to the opening you see in the lower right of this photo. This PVC conduit contains feeder conductors connected to an onsite generator.

Section 352.44 calls for expansion fittings to be installed where the length change in a straight run of PVC between securely mounted items such as boxes, cabinets, elbows, or other conduit terminations, in accordance with Table 347-9(A), is expected to be ¼ in. or greater. The thermal expansion characteristics of PVC rigid nonmetallic conduit is shown in Table 352.44.

In addition, this particular exposed conduit does not appear resistant to sunlight effects, as noted in 352.100, nor does it meet the "securing and supporting" requirements of 352.30.

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