WT Connectors

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Alwayslearningelec

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NJ
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Have a job where they spec RGS. The job is inside a building but heavy mechanical building.

The spec says. All conduit connections should be watertight. Use watertight hubs for conduit connection to equipment enclosures.

So I guess(not for equipment enclosures, but say a 4" box it would have to be a hubbed box and not concentric KO with locknuts?
 
LarryFine said:
I would ask for a clarification. That could be an expensive and time-consuming error.
Click to expand...
What's the other conduit termination option? locknut and bushing? Could you use locknut and bushing with a FS/FD/Cast box or it's only threaded hub for those type boxes?
 
This is in the spec.

qq. Rigid metal conduits entering enclosures or boxes shall be installed on the outside
with mechanical-galvanized or hot-dipped galvanized malleable iron, insulated
throat, rain tight hubs, as manufactured by OZ/Gedney A Division of Emerson Type
CHM-T or approved equal.
rr. Secure conduits on the inside of the box with a mechanically galvanized steel or
malleable iron, 150 degree C., insulated grounding bushing, with solid copper alloy
cradle lug type termination for copper ground conductor and hexagonal head screw
(for conductors larger than No. 4) or slotted head screw (for No. 4 conductor or
smaller), with a smooth spherical point and screw shank diameter equal in size to
the largest diameter of copper conductor within the lug capacity.
 
"......shall be installed on the outside........"
Although I don't find it that clear, from the wording it appears they may be referring to Myers hubs on conduit runs on the "outside" of the structure and not throughout.
 
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