Expansion fittings are need how often

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KRK437 said:
What is the required distance in a conduit run by Code that a expansion fitting is required?
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It depends both on the type of installation and the type of raceway. Earth movement or other structural locations where known or expected displacements are likely is a "type of installation" condition. The "type of raceway" condition is summarized in 300.7(B) and its FPN.
 
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