Thomas & Betts XJG104-TB XJG Expansion Couplings

The XJG104-TB is the 4 inch trade size fitting in the XJG expansion coupling line. It is a threaded-model fitting, so it lands on threaded rigid conduit ends of that size. Overall body length is 12.87 inches with a 6.37 inch outside diameter, so allow room in the raceway run and at any strut or clamp support.

No. The XJG expansion coupling uses a true internal bonding jumper, so no external grounding strap is required. The jumper sits inside the fitting where it is protected from weather and tampering, which is the practical difference from expansion fittings that need a separate bonding jumper kit installed across the joint.

Use one where a long conduit run crosses a building expansion joint or where thermal movement along the run has to be absorbed. The XJG design permits linear movement and exceeds code requirements for long runs. A plain coupling locks the two conduit ends together and transfers that movement into the conduit, the supports, and the enclosures instead.

It carries UL listing under file E23018 and is CSA certified. That is the documentation an inspector or a spec reviewer on an institutional job will look for on an expansion fitting used in a grounded metallic raceway system.

It is a single-piece assembly, not a two-piece design, and it has no inspection opening or cover. There is nothing to open up in the field, so the bonding path inside stays sealed once the coupling is threaded onto the conduit.

Order by manufacturer part number XJG104-TB from Thomas & Betts. It ships as a single fitting per carton, with an outer carton measuring 30.62 x 6 x 6.5 inches.