NSI Industries SB-390NM - Split Bushing, Insulated, Plastic, 4 Inch Trade Size. Patented
NSI Industries

SB-390NM

UPC: 781747403902


Documents & Media
Specification SheetVideo ClipWarranty

Contact for Pricing

Overview

NSI Industries SB-390NM is a patented, insulated plastic split bushing designed for 4-inch trade size conduits. Unlike traditional bushings that must be installed before wire pulling—risking burned bushings or difficult removal—the SB-390NM installs after the wire pull, eliminating wasted time and material. This post-pull installation method reduces labor costs by avoiding the need for pullers or rework, making it ideal for electrical contractors and industrial maintenance teams. The split design allows for easy installation around existing wires without disassembly, while the plastic construction provides electrical insulation and corrosion resistance. Compatible with standard 4-inch conduits, this bushing is a practical solution for new installations and retrofits in commercial, industrial, and utility applications. The SB-390NM is manufactured in the US by NSI Industries, ensuring quality and reliability for demanding electrical and industrial environments.
  • Patented split design for post-pull installation in 4" conduits
  • Insulated plastic construction resists corrosion and electrical interference
  • Eliminates pre-installation steps, reducing labor time and material waste
  • Compatible with standard 4" trade size conduits
  • Ideal for commercial, industrial, and utility applications

Specifications

Application
Used in situations where wires have already been pulled through Rigid/IMC conduit, and an insulated bushing is required. Rated 105 Degree C. cULus listed. Patented
Bushing Type
Split
Color
Gray
Finish
No Finish
Material
Plastic
Material
Nylon Plastic
Size
4 IN
Standard
cULus
Temperature Rating
105 Degree C
Trade Size
4 in
Type
Bushing
Package Weight (Imperial)
0.101 L
Package Weight (Metric)
0.046 kg
Split Bushing, Insulated, Plastic, 3.5 Inch Trade Size.Patented

SB-389NM

Split Bushing, Insulated, Plastic, 3.5 Inch Trade Size.Patented
Split Bushing, Insulated, Plastic, 1 Inch Trade Size. Patented

SB-383NM

Split Bushing, Insulated, Plastic, 1 Inch Trade Size. Patented
Split Bushing, Insulated, Plastic, 1-1/2 Inch Trade Size. Patented

SB-385NM

Split Bushing, Insulated, Plastic, 1-1/2 Inch Trade Size. Patented
Split Bushing, Insulated, Plastic, 2 Inch Trade Size. Patented

SB-386NM

Split Bushing, Insulated, Plastic, 2 Inch Trade Size. Patented
Split Bushing, Insulated, Plastic, 2.5 Inch Trade Size. Patented

SB-387NM

Split Bushing, Insulated, Plastic, 2.5 Inch Trade Size. Patented
Split Bushing, Insulated, Plastic, 3 Inch Trade Size. Patented

SB-388NM

Split Bushing, Insulated, Plastic, 3 Inch Trade Size. Patented
Split Bushing, Insulated, Plastic, 1-1/4 Inch Trade Size. Patented

SB-384NM

Split Bushing, Insulated, Plastic, 1-1/4 Inch Trade Size. Patented
Bushing, Plastic - 105 Degrees C, Size 5 Inch

331

Bushing, Plastic - 105 Degrees C, Size 5 Inch
Bushing, Plastic - 105 Degrees C, Size 1 1/2 Inch

325

Bushing, Plastic - 105 Degrees C, Size 1 1/2 Inch
Bushing, Plastic - 105 Degrees C, Size 3 Inch

328

Bushing, Plastic - 105 Degrees C, Size 3 Inch
Bushing, Plastic - 105 Degrees C, Size 4 Inch

330

Bushing, Plastic - 105 Degrees C, Size 4 Inch
Bushing, Plastic - 105 Degrees C, Size 1/2 Inch

321

Bushing, Plastic - 105 Degrees C, Size 1/2 Inch

Frequently Asked Questions

What is the maximum operating temperature?

The product is rated for a maximum operating temperature of 105 degrees Celsius.

What is the trade size of the SB-390NM?

The trade size of the SB-390NM is 4 inches.

Is the SB-390NM cULus listed?

Yes, the SB-390NM is cULus listed.

What is the material of the SB-390NM?

The SB-390NM is made of nylon plastic.

What are the dimensions of the SB-390NM?

The dimensions are 2.66 inches (A), 0.70 inches (B), 3.90 inches (C), and 4.91 inches (D).

What applications is the SB-390NM used for?

It is used where wires have already been pulled through Rigid/IMC conduit or EMT fittings and an insulated bushing is required.

What certifications does the SB-390NM have?

It meets Federal Specification Number A-A-50553, NEMA Standard FB-1, and UL Standard UL-514B.

How many units are in a standard package?

The standard package quantity is 20 units.

Frequently Asked Questions about NSI Industries

How are Tork products typically installed?

Tork products are typically installed by trained technicians who follow a comprehensive commissioning process. This includes verifying the work environment, conducting electrical installation checks, performing internal and external equipment inspections, powering on the system, and executing operational tests to ensure compatibility and reliability.

What environmental ratings do Tork products have?

Tork products are designed to meet various environmental ratings, including NEMA Type 4X and Type 6, which provide protection against corrosion, windblown dust, rain, and occasional temporary submersion. These ratings ensure that Tork products can withstand harsh industrial environments while maintaining operational integrity.

What communication protocols do Tork products support?

Tork products support a comprehensive range of communication protocols, including PROFIBUS DP V1, PROFINET with dual port, EtherNet/IP with dual port, CANopen, and Modbus RTU integrated as standard. These protocols facilitate flexible network integration and high-performance communication across various industrial automation systems.

What are the key features of Tork products?

Tork products are designed with advanced features that enhance efficiency and reliability in industrial applications. Key features include integrated harmonics and EMC design for improved power quality, removable terminals for quick installation, and USB ports for easy troubleshooting. Additionally, Tork solutions emphasize user-friendly setup with application wizards and memory modules for convenient parameter management.

What are the main product lines offered by Tork?

Tork offers a diverse range of products primarily focused on industrial automation, including TORK® Photocontrols, lighting controls, and various electrical components such as enclosures, occupancy sensors, and grounding solutions. These products are designed to enhance efficiency and reliability in commercial and industrial applications.

What technical support does Tork offer?

Tork offers a comprehensive range of technical support services, including 24/7 customer support, on-site service management, and a technical hotline network. With three advanced technical support centers and over 8,000 hours of technical training conducted annually, Tork ensures certified expertise across 25+ languages to assist customers effectively. Their commitment to service is reflected in a 98% Service Level Agreement compliance rate, providing reliable support for all operational needs.

What industries and applications are Tork products used for?

Tork products are utilized across a variety of industries, including food processing, healthcare, hospitality, and manufacturing. They are designed for applications such as hand hygiene, surface cleaning, and dispensing solutions, ensuring efficiency and compliance in environments that require high standards of cleanliness and safety.

What certifications and standards do Tork products comply with?

Tork products comply with UL and cUL certifications, ensuring they meet rigorous safety and performance standards. Additionally, many models are designed to meet NEMA enclosure ratings, providing protection against environmental factors.

How are Remke products typically installed?

Remke products are typically installed through a systematic process that includes site audits to verify proper wiring, followed by remote or on-site commissioning. This commissioning involves installation verification, programming, and communication testing to ensure the system operates reliably and meets design specifications.

What accessories are available for Remke products?

Remke offers a wide range of accessories for their products, including panel mounting kits, fuse holders for voltage inputs, ferrites for communication modules, and current transformers. These accessories enhance the functionality and protection of Remke's industrial automation solutions, ensuring reliable performance in various applications.