Thomas & Betts LB Conduit Body, Sand Cast Aluminum, FM7

The Thomas & Betts LB7SA series is a sand cast aluminum Type LB conduit body, with threaded hubs sized by trade size from 1/2 inch through 4 inch (LB17SA through LB107SA). The Arlington 935NM AnyBODY is a non-metallic LB-style conduit body in 2 inch, threadless. So the choice is metal and threaded against non-metallic and threadless: the T&B body threads onto rigid or IMC conduit, while the threadless Arlington body accepts conduit without threading it. If your raceway is threaded rigid aluminum or steel, the T&B LB67SA is the 2 inch counterpart.

Sand cast aluminum bodies thread onto rigid or IMC conduit, and aluminum is the usual choice outdoors because it does not rust like malleable iron. The one caution is dissimilar metal contact: aluminum fittings on galvanized steel conduit, especially in coastal or wet locations or in direct contact with concrete and masonry, can corrode at the joint. If the run is in concrete or a corrosive environment, specify an aluminum conduit run or a PVC-coated body instead.

The LB bodies in this family are the FM7 cover series, meaning they take the Form 7 wedge-style cover. Confirm the cover and gasket are part of the carton for the size you are ordering, since many LB bodies ship as body-only and the cover plus gasket is a separate line item. For a wet location you need both the cover and the gasket to maintain the seal.

No. An LB conduit body is a pulling and direction-change fitting, not a splice point, unless the body is marked with its cubic inch volume. Standard LB bodies are sized for conductors to pass through only. If you need to splice, use a box or a volume-marked body of adequate size.

For a 2 inch run, the Arlington Industries 935NM AnyBODY LB-style body is a non-metallic, threadless option. Threadless means it slips over the conduit rather than threading on, which is useful on a retrofit where you cannot rotate or rethread the existing pipe. The Thomas & Betts LB in sand cast aluminum is the threaded metallic choice and is what you want where the raceway is being used as the equipment grounding path.

For a 2 inch run you have both options: the Thomas & Betts LB67SA in sand cast aluminum, or the Arlington 935NM AnyBODY, which is non-metallic and threadless. The non-metallic body is the one to reach for when you want a corrosion-resistant body that does not need to carry equipment ground continuity through the fitting, and when the conduit ends are not threaded. The aluminum T&B body is the match when the specification calls for a metallic conduit body on threaded rigid or IMC. Note the Arlington is cataloged in 2 inch only, so sizes such as 1/2 inch, 1-1/4 inch, 3 inch and 4 inch come from the T&B LB7SA series.

The number encodes the size and material: LB17SA is 1/2 inch, LB27SA is 3/4 inch, LB37SA is 1 inch, LB47SA is 1-1/4 inch, LB67SA is 2 inch, LB77SA is 2-1/2 inch, LB87SA is 3 inch and LB107SA is 4 inch, all sand cast aluminum. Read the cast marking on the old body, or measure the conduit trade size, and order the matching part.