Cable tray rail

1. A cable tray comprising:

first and second cable tray sections disposed end-to-end so that a longitudinal end of the first cable tray section is adjacent a longitudinal end of the second cable tray section, each cable tray section including

a pair of parallel rails having opposite longitudinal ends and forming sides of the corresponding cable tray section, wherein each rail comprises a generally vertical web having opposite upper and lower ends, an upper flange at the upper end of the web, a lower flange at the lower end of the web, a rib extending downward from the upper flange of the corresponding rail and spaced outboard from the vertical web and inboard from an outboard terminal end of the upper flange, and a splice plate retention groove defined by the rib, the upper flange and the web and generally adjacent at least one of the longitudinal ends of the rail, and

a plurality of rungs on the lower flanges of the rail, the plurality of rungs extending between the rails and being spaced apart from one another along the cable tray section; and

at least one generally planar splice plate, wherein an upper edge margin of the generally planar splice plate is received in at least one pair of adjacent splice plate retention grooves of the first and second cable tray sections, wherein the splice plate is in face-to-face engagement with the corresponding web, and the corresponding rib is configured to inhibit the upper edge margin of the splice plate from moving outboard of the web.

2. The cable tray set forth in claim 1 , wherein the at least one generally planar splice plate includes a plurality of generally planar splice plates, wherein each pair of adjacent splice plate retention grooves has one of the plurality of generally planar splice plates received therein.

3. The cable tray set forth in claim 1 , wherein the rib extends along substantially an entire length of the upper flange of the corresponding rail.

4. The cable tray set forth in claim 1 , wherein the upper edge margin of the generally planar splice plate forms an interference fit with at least one of the rib, the portion of the upper flange, and the upper portion of the vertical web.

5. The cable tray set forth in claim 1 , further comprising fastener assemblies fastening the at least one generally planar splice plate to first and second cable tray sections.

6. A method of assembling a cable tray, the method comprising:

providing first and second cable tray sections having opposite longitudinal ends, each cable tray section including

first and second parallel rails having opposite longitudinal ends and forming sides of the corresponding cable tray section, wherein each rail comprises a generally vertical web having opposite upper and lower ends, an upper flange at the upper end of the web, a lower flange at the lower end of the web, a rib extending downward from the upper flange of the corresponding rail and spaced outboard from the vertical web and inboard from an outboard terminal end of the upper flange, and a splice plate retention groove defined by the rib, the upper flange and the web and generally adjacent at least one of the longitudinal ends of the rail, and

a plurality of rungs on the lower flanges of the rail, the plurality of rungs extending between the rails and being spaced apart from one another along the cable tray section; and

connecting the first and second cable tray sections end-to-end using at least one generally planar splice plate, said connecting including inserting an upper edge margin of the at least one generally planar splice plate into at least one pair of adjacent splice plate retention grooves of the first and second cable tray sections, wherein the splice plate is in face-to-face engagement with the corresponding web, and the corresponding rib is configured to inhibit the upper edge margin of the splice plate from moving outboard of the web.

7. The method of assembling a cable tray set forth in claim 6 , wherein said connecting further includes retaining the at least one generally planar splice plate in the at least one pair of adjacent splice plate retention grooves of the first and second cable tray sections by an interference fit between the at least one generally planar splice plate and the first and second cable tray sections within the at least one pair of adjacent splice plate retention grooves.

8. The method of assembling a cable tray set forth in claim 6 , wherein said connecting further includes fastening the at least one generally planar splice plate to the first and second cable tray sections using fastener assemblies.

9. The method of assembling a cable tray set forth in claim 6 , wherein said inserting the at least one generally planar splice plate includes sliding the at least one generally planar splice plate lengthwise of the at least one splice plate retention groove.