Bridgeport Fittings 390-DC40 Rigid Conduit Fittings

Bridgeport Fittings 390-DC40 is a 4-inch insulated grounding bushing designed to terminate service conduit to cabinets in rigid or IMC conduit systems. Cast in ball-burnished zinc die-cast with a threaded design, it carries UL 514B and UL Canada/US approvals and measures about 4-13/16 inches in diameter for a 4-inch trade size application, and is commonly used with a locknut to secure the conduit-to-cabinet connection. It provides a grounding lug compatible with conductors from 6 AWG solid up to 250 kcmil stranded, ensuring a solid equipment ground through the enclosure while the threaded bushing maintains seal integrity in threaded rigid conduit. Compatible with rigid and IMC conduit fittings, this Bridgeport part is typically sold in standard packaging of 20 pieces and is a reliable choice for code-compliant cabinet terminations in commercial and industrial electrical installations.