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The NSI INDUSTRIES 233 is a 1-1/4 inch steel set screw connector designed for use with electrical metallic tubing (EMT) conduit systems. It secures EMT conduit to an electrical enclosure, junction box, or panel knockout using a set screw clamping mechanism, providing a reliable mechanical connection without threading. Constructed from steel, it delivers durable performance in standard commercial and residential electrical installations. Licensed electricians and electrical contractors are the primary installers of this fitting.
This connector is suited for use in commercial and residential electrical installations where EMT conduit transitions into enclosures, load centers, or junction boxes. The 1-1/4 inch trade size accommodates corresponding EMT conduit runs in branch circuit and feeder wiring applications. It is commonly installed in exposed or concealed conduit systems where a clean, secure conduit-to-enclosure connection is required.
Designed as an OEM-style replacement and standard-fit connector for 1-1/4 inch EMT conduit systems in residential and commercial electrical installations.
Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize all circuits in the enclosure before installing or adjusting conduit connectors. A screwdriver or hex key is typically used to tighten the set screw against the conduit. Do not overtighten the set screw, as this may deform the conduit wall or compromise the connection.
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