B-Line Eaton series wireway telescoping fitting, Lay-in, Wireway telescoping fitting, 12, Steel, ANSI 61 gray painted

The Eaton B-Line 66-12FTF is sized for 6 x 6 inch lay-in wireway. Its body measures 5.82 inches high by 5.82 inches wide, which is the cross section that mates to a nominal 6 x 6 run, and it is 15.5 inches long so it can telescope to close a gap between two fixed sections.

It closes the gap when two wireway sections are already fixed in place and you cannot slide a standard coupling in between. The 66-12FTF slips over the ends and adjusts within its 15.5 inch length, so you can finish a run between mounted equipment, through a wall penetration, or where a cut section left you short. Lay-in construction means the cover comes off and conductors drop in rather than being pulled.

It is a NEMA 12 fitting, so it is rated for indoor use against dust, falling dirt, and dripping noncorrosive liquids. That covers most plant floor and mechanical room work but not hosedown, outdoor, or rain exposure. For those conditions you need a NEMA 3R or 4 rated wireway and matching fittings, not this one.

Yes, the 66-12FTF carries a UL Listing, which is what an inspector or an institutional spec typically calls for on wireway and its fittings.

No. The 66-12FTF is a straight closure piece only, used to join two in-line sections and take up slack in the run. For a turn you need an elbow or a tee fitting in the same 6 x 6 NEMA 12 lay-in family; for a plain end-to-end joint where both sections can still move, a standard coupling is the simpler part.

The fitting is painted ANSI 61 gray, the standard gray used across B-Line steel wireway and most industrial enclosure lines, so it blends with an existing painted steel run rather than standing out as a patch.

It weighs 10.443 lb, so a single installer can hold it in position on a ladder while starting the screws. It is painted steel rather than a light sheet fitting, so support the adjoining wireway sections normally and do not let the fitting carry run weight.