Serve as pulling fittings; Make bends in conduit system; Provide openings for splicing; Connect and change direction of conduit runs; Allow connections for branch runs; Permit access to conductors for maintenance; Smooth, rounded integral bushings in hubs
Standard:
UL 514A, UL 514B, UL File Number E2527, CSA C22.2 No. 18.3, CSA 065183, NEMA FB-1