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Answer :
A bushing is a device that is inserted into the opening of a box, fitting, or enclosure, and it provides a barrier between the sharp edges of the opening and the wire that is entering the device.
The purpose of a bushing is to protect the wire from abrasion, which can cause damage to the wire and potentially create a hazard.
The National Electrical Code (NEC) requires that bushings be installed in all boxes, fittings, and enclosures where RMC (rigid metal conduit) enters to protect the wire.
However, if the design of the box, fitting, or enclosure provides equivalent protection, a bushing may not be necessary. It is important to follow the NEC guidelines to ensure safe electrical installations.
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