Grounding bushing installable to raceway before or after wires are in the raceway
A grounding bushing with a central opening for electrically grounding a conduit, electrical metal tubing (EMT), or a pipe. The grounding bushing includes a stationary bushing portion and a rotatable bushing portion having slotted ends held together by mounting fasteners. The slotted ends permit rotation of the rotatable bushing portion away from the stationary bushing portion. After attachment to a conduit or similar structure, one or more mounting fasteners can be loosened to allow installation of additional wires through the central opening and into the conduit, EMT, or pipe. An electrically insulated liner extending around the entire inner periphery of the bushing prevents chafing or abrasion of any electrical wires by the end of the conduit.
1. A grounding bushing comprising:
a substantially ring-shaped body including a stationary bushing portion and a rotatable bushing portion each having two ends, said ring-shaped body including a ring opening;
said stationary bushing portion including threaded bores on each end;
said rotatable bushing portion including a bottom edge, a first slot on said first end and a second slot on said second end, said slots having a slot opening;
a mounting fastener extending through each of said slots on said ends of said rotatable bushing portion and threaded into said threaded bores of said stationary bushing portion; and
said first end of said rotatable bushing portion is thicker than said second end of said rotatable bushing portion.
2. The grounding bushing of claim 1 , comprising:
said first slot on said first end of said rotatable bushing portion orthogonal to the axial center of said ring-shaped body; and
said slot opening of said first slot facing radially outward of the ring-shaped body.
3. The grounding bushing of claim 2 , comprising:
said second slot on said second end of said rotatable bushing portion parallel to the axial center of said ring-shaped body; and
said slot opening of said second slot facing the bottom edge of said ring-shaped body.
4. The grounding bushing of claim 1 , comprising:
said ring-shaped body including an inner periphery; and
a tooth extending into said ring opening from said inner periphery of said stationary bushing portion.
5. The grounding bushing of claim 4 , comprising:
a sloped upper surface on said tooth; and
a sharp edge on said tooth, said sharp edge directed toward said ring opening.
6. The grounding bushing of claim 5 , comprising:
a lip extending into said ring opening from said inner periphery of said stationary bushing portion; and
said lip at the edge of said stationary bushing portion opposite said tooth.
7. The grounding bushing of claim 6 , comprising a notch in said lip.
8. The grounding bushing of claim 7 , comprising said notch in in axial alignment with the tooth along the axial center of said ring-shaped body.
9. The grounding bushing of claim 1 , comprising said threaded bores on said stationary bushing portion including threaded bores on each end.
10. The grounding bushing of claim 6 , comprising a liner to fit within said inner periphery of said ring-shaped body.
11. The grounding bushing of claim 10 , comprising:
said liner including a top flange and a bottom flange defining a gap there between; and
said liner held within said ring-shaped body by said lip of said bushing extending into said gap of said liner.
12. The grounding bushing of claim 11 , comprising said top flange of said liner extends across said edges of said ring-shaped body.
13. The grounding bushing of claim 12 , wherein said liner comprises two ends and a tab extending from a first of the ends and a notch on the opposing end of the liner, said tab of the mating liner to ride over the notch of the opposing line and cover the joints of the mated liners of the grounding bushing.
14. The grounding bushing of claim 1 , comprising said ends of said bushing portions include planar mating surfaces.
15. The grounding bushing of claim 1 , comprising:
an integral lug on at least one of said bushing portions, and
a grounding conductor opening and a bore on said integral lug.
16. The grounding bushing of claim 15 , comprising a screw to secure a grounding wire in said grounding conductor opening.