Outside corner 90 bend emt wet location options

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Smart $ said:
The problem is you are saying any threaded connection. Perhaps. But all threaded entries have not been investigated. Reducing washers use the locknut. Some bell boxes have threaded entries, but not full depth hubs; the end of the connector protrudes into the box when the connector is wrench tight, leaving enough connector threads for the locknut to be installed.
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When using reducing washers the locknut doesn't touch the enclosure. It only touches the reducing washer. The ground fault path is just from the clamping friction connection between the reducing washer and the enclosure. Often the enclosure is so thin, that there is not any clamping action between the reducing washers and the enclosure because of the design of the reducing washers. I don't see how any threaded connection that actually mates would be a less secure ground fault path than the path provided by the reducing washer.
 
don_resqcapt19 said:
When using reducing washers the locknut doesn't touch the enclosure. It only touches the reducing washer. The ground fault path is just from the clamping friction connection between the reducing washer and the enclosure. Often the enclosure is so thin, that there is not any clamping action between the reducing washers and the enclosure because of the design of the reducing washers. I don't see how any threaded connection that actually mates would be a less secure ground fault path than the path provided by the reducing washer.
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Using listed components in an assembly doesn't necessarily mean the assembly is approved. An enclosure which is so thin as to effectively allow slippage in the connection after installation, the assembly is definitely in the workmanship category of the installer. He should investigate an alternative connection method (such as a hub with a reducer).
 
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