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This is what happens when the expansion fitting is NOT installed. The side of the box was pulled completely out. These were taken in a parking garage that is being renovated. The metal conduit will probably be replaced by rigid non-metallic conduit sched. 80 WITH expansion fittings.

[Linked Image from electrical-photos.com]

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This is the second of two pictures showing an expansion fitting on rigid conduit. This is how it should be done.

Alan Nadon

[Linked Image from electrical-photos.com]