NSi Industries 403-I - Straight Malleable Iron AC/MC/FMC connector.  3/8" trade size. UL listed for sizes 14/4 to 6/3 AC/MC/MCIA.  For use with 3/8" trade size FMC.
NSI Industries

403-I

UPC: 781747104038


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Overview

The NSi Industries 403-I Straight Malleable Iron AC/MC/FMC Connector is a robust, UL-listed solution engineered for secure electrical installations requiring 3/8" trade size conduit connections. Designed for use with AC, MC, and FMC cables ranging from 14/4 to 6/3 AWG, this connector ensures reliable performance in demanding industrial and commercial environments. Constructed from durable malleable iron with an electro-zinc plated finish, the 403-I delivers exceptional corrosion resistance and mechanical strength, meeting UL and CSA certification standards (UL File No: E-23018, CSA File No: LR-2884). Key features include a lay-in lug design for simplified installation, a thermoplastic insulator rated for 150°C (302°F) applications, and a unique saddle design that secures cables with holding power exceeding listing agency requirements. The connector's insulated throat reduces wire pulling effort by up to 50%, while the included locknut ensures a vibration-resistant, concrete-tight seal when mounted to enclosures or conduit bodies. Compatible with 3/8" trade size flexible metal conduit (FMC), the 403-I is ideal for applications requiring quick, leak-proof connections in rigid and intermediate metal conduit systems. Available with optional DURA-PLATE® finish for enhanced corrosion protection, the 403-I is manufactured in the USA and meets NFPA 70 (NEC) and NEMA FB1 standards. Its compact dimensions (4.781" x 3.193" x 1.310") and lightweight design (0.975 lbs) make it suitable for tight spaces and high-density installations. Whether used in power distribution, motor control centers, or industrial machinery, the 403-I provides a dependable, code-compliant connection solution for electrical contractors and engineers.
  • UL Listed for 14/4 to 6/3 AC/MC/MCIA cables and 3/8" trade size FMC
  • Malleable iron construction with electro-zinc plating for corrosion resistance
  • Thermoplastic insulator rated for 150°C (302°F) applications
  • Lay-in lug design simplifies installation and reduces wire pulling effort by 50%
  • Includes locknut for vibration-resistant, concrete-tight seal

Specifications

Angle
180 Deg
Application
For use with AC/MC/MCIA in Steel or Aluminum in sizes from 14/4 to 6/3 and FMC in 3/8" trade sizes.
Conductor Range
14/4 to 6/3 AC/MC/MCIA
Connector Type
Squeeze, Insulated
Finish
Zinc Plated
Material
Malleable Iron - Zinc Plated
Number Of Conductors
1 Cable
Size
3/8 IN
Special Features
NPSM Threads ROHS Compliant
Standard
cULus
Temperature Rating
105?°C
Trade Size
3/8 IN
Type
Connector
Package Weight (Imperial)
0.079 L
Package Weight (Metric)
0.036 kg

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Frequently Asked Questions

What is the trade size of the 403-I connector?

The trade size of the 403-I connector is 3/8 inches.

Is the 403-I connector UL listed?

Yes, the 403-I connector is UL listed under standard 514B.

What is the finish of the 403-I connector?

The finish of the 403-I connector is zinc plated.

What is the catalog ID for the 403-I connector?

The catalog ID for the 403-I connector is 403-I.

What materials is the 403-I connector made from?

The 403-I connector is made from malleable iron and is zinc plated.

What sizes of AC/MC/MCIA can the 403-I connector accommodate?

The connector accommodates AC/MC/MCIA sizes from 14/4 to 6/3.

What types of conduit can the 403-I connector be used with?

The 403-I connector can be used with AC, MC, MCIA, and FMC conduit.

What is the UPC number for the 403-I connector?

The UPC number for the 403-I connector is 78174710403.

What is the standard packaging quantity for the 403-I connector?

The standard packaging quantity for the 403-I connector is 500 units.

What is the Federal Specification Number for the 403-I connector?

The Federal Specification Number for the 403-I connector is A-A-50553.

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.