The perception that steel fittings will outperform similar type fittings manufactured from die cast zinc is untrue. In fact, just the opposite may be true.

During the listing process at Underwriters Laboratories, all fittings, regardless of material, are tested to the same stringent standard (specification UL514B) to comply with application requirements of the National Electrical Code.

For example, EMT connectors are subjected to:

• Method of assembly
• Screw torque test (set screw type) or Hex nut torque test (compression type)
• Metallic coating thickness test (steel only)
• Concrete-Tightness test (set screw type) or Wet-Locations test (compression type)
• Bend test and Pull test
• Resistance test
• Ground fault current test
• EMT deformation test (set screw type only)

the same test parameter values are used throughout the ul listing procedure regardless of material. some functional tests include set screw torque of 35 in.-lbs (160 in.-lbs for hex head screw), compression nut torque of 175 in.-lbs (1/") to 1600 in.-lbs (2" and up), conduit pull test of 300 lbs (1/") to 1000 lbs (2" and up), and current test of 1180 amperes for 4 seconds (1/") to 5050 amperes for 9 seconds (3" and up).

in addition to similar performance characteristics, zinc die cast fittings are accepted by federal specification a-a-50553 and, unlike steel which can rust, zinc is inherently corrosion resistant and provides dimensional repeatability that cannot be found in steel.

Always use Bridgeport's UL listed Zinc Die Cast Fittings





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