Kraloy 078283 3-Inch PVC Junction Box Adapter

The Kraloy JBA30 (part 78283) is a 3 inch PVC junction box adapter, so it mates with 3 inch rigid PVC conduit. The connection is solvent welded, which means you cement it rather than thread or clamp it.

The solvent welded joint on the JBA30 gives a watertight connection, and the body is corrosion resistant PVC. That is why it gets specified in car washes, marinas, food and fish processing plants, water and sewage treatment plants, and parking garages. You still need the box and cover it feeds into to be rated for the location.

No. The 78283 is the JBA30 adapter only, the fitting that transitions 3 inch PVC conduit into the box. Order the enclosure and cover separately. Non-metallic options include the Cantex 4-1/8 inch junction box with cover (5133690) or the Carlon E987R polycarbonate screw-cover box in 6 x 6 x 4 inches.

The Kraloy 078283 JBA30 is a 3 inch PVC junction box adapter that joins into a run with a solvent welded, watertight connection. When the job calls for a sizable enclosed wiring compartment instead, the Carlon E987R is a polycarbonate screw-cover junction box measuring 6 by 6 by 4 inches, so conductors can be pulled and spliced inside and the cover reopened later. The Kraloy part is an adapter at the box, while the E987R is the box itself with a screw-on lid.

The Kraloy 078283 JBA30 is made from durable, corrosion resistant PVC and is intended for applications such as car washes, marinas, and water and sewage treatment plants, with a solvent welded watertight joint. The Orbit 4SDB square deep box is welded steel with a 1 inch knockout, and the Orbit D4SB is a drawn steel 4 inch square box 1-1/2 inches deep. Those steel boxes are a different material family, so in wet and corrosive environments the non-metallic Kraloy construction is the one matched to the described use.

Pick PVC where moisture or chemicals would eat steel: utilities, mines, pulp and paper, steel mills, subways, bridges and tunnels, agricultural buildings. The JBA30 is non-metallic and corrosion resistant, and it solvent welds into the conduit run. If you are in a dry indoor commercial space and want a metal raceway system instead, a drawn or welded steel box such as the Orbit D4SB 4 inch square or the Orbit 4SDB square deep box is the metallic route.

Yes. The Kraloy 078283 JBA30 is sized for 3 inch PVC and bonds with a solvent welded joint, so it suits large raceway. For a small branch circuit box, the Cantex 5133690 is a 4-1/8 inch junction box supplied with a 1/2 inch knockout and a cover. The Cantex is a complete box with its own entry point; the Kraloy is the adapter fitting for a 3 inch run.

Both are non-metallic PVC. The Kraloy 078283 JBA30 is a 3 inch junction box adapter that solvent welds for a watertight fit and is listed to UL 651 and CSA C22.2 No. 85. The Cantex E983G is a family of non-metallic PVC junction boxes, so it is the enclosure rather than the adapter that transitions a 3 inch PVC run into one. On a 3 inch raceway the two are typically used together, not in place of one another.

Yes, those are listed applications along with highway lighting, bridges and tunnels, airports, communications and cable work. The PVC body resists corrosion in direct-burial and below-grade handhole environments typical of those jobs.

It is built to take up little space so the interior wiring volume stays usable, which matters when you are pulling multiple large conductors through a 3 inch entry and need bending room at the box.