All references are based on the 2014 edition of the NEC. No Room to Grow As indicated by these two photos, when PVC thermal expansion and contraction is not taken into consideration when designing and installing PVC conduit runs, the pipe run can simply self-destruct. Section 300.7(B) requires expansion fittings to be used on raceways “where necessary to compensate for thermal expansion and contraction.” Section 352.44 more specifically ...

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