NSi Industries 239-I - Connector, Set Screw, Steel, Insulated Throat, Size 4 Inch
NSI Industries

239-I

UPC: 781747102393

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Overview

The NSi Industries 239-I is a 4-inch set screw connector designed for rigid and intermediate metal conduit systems. Constructed from hardened steel, this connector delivers superior strength and durability in industrial applications. Its insulated throat reduces wire pulling effort by up to 50%, enhancing installation efficiency while preventing electrical arcing. The captive hex head screws ensure a secure, vibration-resistant connection that meets UL 514B and CSA C22.2 No. 18 standards. Certified for concrete tight installations, the 239-I is ideal for power distribution, manufacturing machinery, and commercial electrical systems where reliable, code-compliant connections are critical. Compatible with 4-inch conduit, this connector eliminates the need for threading while providing a ground path through the steel body. Finished with electro zinc plating and chromate coating for corrosion resistance, it meets NFPA 70-1999 (ANSI) and Federal Specification W-F-408 requirements.
  • 4-inch size for rigid/intermediate metal conduit systems
  • Hardened steel construction with electro zinc plating for corrosion resistance
  • Insulated throat reduces wire pulling effort by up to 50%
  • Captive hex head screws ensure vibration-resistant, secure connections
  • UL 514B and CSA C22.2 No. 18 certified for concrete tight installations

Specifications

Application
Used to secure steel EMT to box or enclosure. Concrete-tight when taped. Plastic insulator rated 105 degree C.
Connection Type
Set Screw
Connector Type
Set Screw
Finish
Zinc Electroplated
Insulation
Insulated Throat
Material
Steel
Material Quality
Steel
Series
239
Size
4 IN
Size
4 Inch
Special Features
Furnished with Tri-Drive slot/Phillips/Robertson head screws
Standard
cULus
Temperature Rating, Maximum
221.00000 F
Temperature Rating, Maximum
105 °C
Temperature Rating, Maximum
221 F
Temperature Rating, Maximum
105 C
Temperature Rating, Minimum
221.00000 F
Temperature Rating, Minimum
221 F
Temperature Rating, Minimum
105 C
Trade Size
4 in.
Type
Connector
Package Weight (Imperial)
2.500 L
Package Weight (Metric)
1.134 kg

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Frequently Asked Questions about NSi Industries

What technical support does NSi Industries offer?

NSi Industries offers dedicated technical support through their toll-free technical support line at 888.500.4598. They are committed to customer satisfaction and promise to make every reasonable effort to remedy any product or service issues. Additionally, customers can contact their customer service team at 800.321.5847 or email [email protected] for further technical assistance.

What are the key features of NSi Industries products?

NSi Industries products feature exceptional versatility, reliability, and safety across multiple industrial automation categories. Key features include insulation piercing connectors with no wire stripping required, watertight and corrosion-free designs, wide wire range compatibility (from #14 AWG to 750 MCM), and the ability to install on energized conductors. Their product lines like Easy-Tap™ Connectors and TORK® Digital Timers demonstrate advanced capabilities such as turbo spacers, double shear-head bolts, astronomic scheduling, and enhanced switching technologies.

What environmental ratings do NSi Industries products have?

NSi Industries enclosures feature robust environmental ratings, including IEC 60529 IP66 certification, NEMA Type 1, 2, 3, 4, 4X, 12, and 13 ratings, and UL/CSA standards. Their products are designed for both indoor and outdoor applications, with protection against dust, water, corrosion, and extreme temperatures ranging from -40°F to 266°F.

How are NSi Industries products typically installed?

NSi Industries products are typically installed using detailed mechanical and digital wiring diagrams that specify precise connection methods for various voltage configurations (120V, 208V, 240V, 277V, 480V). Installation involves carefully following product-specific wiring schematics, which include clear terminal block connections, ground wire specifications, and phase alignment requirements. Professional electricians and technicians should reference the specific product's wiring diagram to ensure correct installation and electrical compliance.

What industries and applications are NSi Industries products used for?

NSi Industries provides electrical and automation products for diverse industrial applications, including lighting control, electrical enclosures, wire management, connectors, and sensor technologies. Their product lines serve commercial, industrial, and infrastructure markets with solutions for electrical infrastructure, control systems, and safety-critical environments.

What are the main product lines offered by NSi Industries?

NSi Industries offers a comprehensive range of industrial products including TORK® Photocontrols, Polaris™ Lighting Controls, Easy-Twist™ Grounding Solutions, Miniterms, Cable Ties, Connectors, Enclosures, Occupancy Sensors, and Wire Management systems. Their product lines span electrical components, control devices, and industrial automation accessories designed for diverse applications in commercial and industrial settings.

What accessories are available for NSi Industries products?

NSi Industries offers a range of accessories for their product lines, including photocontrol accessories like replacement caps, mounting brackets, and receptacles. Specific accessories include shorting caps, open caps, 3-pin and 7-pin receptacles, and utility mounting brackets for conduit photocontrols. For specialized applications, NSi recommends contacting their customer service team to discuss custom accessory needs.