When installing connectors to enclosures, NEC article 250-96 requires effective bonding of the metallic raceway to the box or enclosure to maintain continuity and safely conduct ground fault current likely to be imposed. Additionally, non-conductive paint or similar coating must be removed at the locknut contact surface unless the fitting is designed to remove the coating during normal assembly.

During a fact-finding study conducted by Underwriters Laboratories (UL), the observation was made that die cast zinc serrated locknuts, such as those manufactured by Bridgeport Fittings, have the ability to remove non-conductive coatings and safely maintain ground fault current. Other styles of die cast locknuts, such as flat or "nibbed" types, did not pass the UL testing.

All Bridgeport Fittings die cast connectors feature reversible serrated die cast locknuts, including recently redesigned 1/2 inch and 3/4 inch sizes that provide increased coarseness and gripping power. Precision cut threads and extra tightening lugs ease assembly.

To ensure proper removal of paint or coating from enclosure, install the connector into the opening, assemble locknut hand tight, then tighten the locknut 1/4 additional turn. After assembly, look for shiny surface on enclosure where paint or coating has been removed. Always use UL listed connectors with Bridgeport's unique serrated die cast locknut, Bridgeport cat. nos. 101-DC through 110-DC.

Note: Above comments are not an interpretation of the National Electrical Code (NEC) or local regulations. Always consult your local electrical inspector for requirements in your area.

Please send your comments and questions to attn: Engineering at Bridgeport Fittings, Inc., Phone 203.377.5944, Fax: 203.381.3488 or email:eng@bptfittings.com