Thomas & Betts CILBA-1 EMT/Rigid Conduit Body LB, Cast Aluminum

The CILBA-1 is a 1 inch LB conduit body for EMT and rigid conduit. One trade size only, so for 1/2, 3/4 or larger runs you need a different size in the series.

Both. The CILBA-1 is listed as an EMT/rigid body, so it serves 1 inch EMT and 1 inch rigid conduit runs. That matters on jobs where a rigid stub out of a foundation transitions to EMT above grade, since you are not stocking two different bodies.

Both are LB-style conduit bodies, but they are built for different raceway systems. The CILBA-1 is a cast aluminum LB body sized for 1 inch EMT and rigid conduit. The Arlington 935NM is a non-metallic AnyBODY LB-style body in a 2 inch threadless configuration, so it accepts conduit without threaded hubs and is a larger trade size. If the run is 1 inch metal conduit and you need a metallic body for bonding continuity, the CILBA-1 matches it; for a 2 inch threadless non-metallic connection, the 935NM is the one built for that.

Cast aluminum. That makes it suitable for metallic raceway systems where the body carries the equipment grounding path through the conduit, and it holds up better to impact and UV than a plastic body on exposed exterior runs. If your run is PVC or nonmetallic, a cast aluminum body is the wrong material choice.

It depends on how you are handling the equipment grounding path and the trade size. The Thomas & Betts CILBA-1 is cast aluminum and made for 1 inch EMT and rigid conduit, so it stays part of a metallic raceway system. The Arlington 935NM AnyBODY is non-metallic and threadless at 2 inch, which means a separate equipment grounding conductor carries the bond through the body rather than the body itself. Inspectors on metal raceway jobs commonly expect a metallic body where the raceway serves as the ground path, which is where the CILBA-1 fits.

A threadless body clamps or grips the conduit instead of accepting a threaded end, which is how the Arlington 935NM AnyBODY LB-style body is configured at 2 inch. The Thomas & Betts CILBA-1 is the EMT and rigid type in 1 inch cast aluminum, so it is the choice when you are working with standard 1 inch metal raceway. Threadless becomes the better answer when you cannot thread or rotate the conduit in place, such as a repair in a fixed run.

Order the CILBA-1 as the body itself. Covers and gaskets for conduit bodies are normally bought as separate items matched to the body size, so plan on specifying a 1 inch cover and, for a wet or damp location, a gasket with it.