Thomas & Betts XD014-TB 6 INCH EXP/DEFL COUPLING

The XD014-TB is the 6 inch size in the Thomas and Betts XD expansion/deflection coupling line. It goes inline in a 6 inch conduit run, so both ends are sized for 6 inch conduit. If your run is a different trade size, you need a different XD model number.

A straight expansion coupling only takes up movement along the length of the run, the kind you get from thermal growth. An expansion/deflection fitting like the XD014-TB handles that axial movement and also allows the conduit to shift sideways and angularly, which is what you need where a run crosses a structural or seismic joint between two buildings or sections that move independently. If your only concern is temperature-driven length change in a straight run, a plain expansion fitting is the simpler choice.

Ductile cast iron. That is the material for the coupling body, which is why these get specified for 6 inch runs where the fitting has to carry real conduit weight and take repeated movement over the life of the building.

Expansion/deflection fittings move, so the conduit path cannot be relied on as the sole equipment ground across the joint unless the fitting is supplied with an internal bonding jumper. On the XD014-TB, confirm the grounding method for your run at the time of order and plan for an external bonding jumper sized to the circuit if your inspector requires a separate path across the joint.

Use a standard rigid coupling for that. The XD014-TB is a movement fitting, built to absorb expansion and deflection at a building joint, and putting one in a run that does not move adds cost and a flexible point you do not need. Specify it only where the raceway crosses a joint that moves.

Thomas and Betts XD014-TB, the 6 inch expansion/deflection coupling from the XD series, ductile cast iron body. That MPN is the ordering identity for the 6 inch size, so it is what you give a distributor or put on a submittal.