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NSI Industries EC-300 - Mighty-Move Expansion Coupling 3" Steel expansion coupling for EMT & Rigid Conduit

NSI Industries EC-300 Mighty-Move Expansion Coupling 3" Steel expansion coupling for EMT & Rigid Conduit

UPC: 781747043078


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Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The NSI Industries EC-300 Mighty-Move® Expansion Coupling is a 3-inch steel coupling designed for EMT and Rigid conduit systems. Engineered to accommodate thermal expansion and contraction in dry-location conduit runs, this coupling prevents stress-related damage to conduit pathways. Installation follows a standard set-screw coupling procedure: slide the coupling end stop onto the fixed conduit end, tighten the screw, insert the movable conduit to mark engagement, then reinstall to half the engagement distance. Constructed from zinc-plated steel, the EC-300 meets NEMA FB-1 and UL514B standards, ensuring compatibility with common industrial conduit systems. With a trade size of 3 inches and dimensions of 12 inches (A) by 3-1/8 inches (B), it provides a cost-effective solution for managing conduit movement without specialized tools. The coupling’s design allows for straightforward retrofitting into existing installations, reducing downtime during maintenance or expansion projects. Ideal for electricians and contractors, the EC-300 delivers reliable performance in environments where temperature fluctuations could compromise conduit integrity.
  • Trade size: 3" for EMT, Rigid, and IMC conduit
  • Material: Zinc-plated steel for corrosion resistance
  • Dimensions: 12" (A) x 3-1/8" (B)
  • Installation: Set-screw coupling with standard EMT/Rigid procedures
  • Durable steel construction

Specifications

Application
Assembles like a regular EMT/RIGID/IMC set screw coupling. To install, simply slide coupling end stop onto fixed end of EMT/RIGID/IMC and tighten screw. Place movable EMT/RIGID/IMC completely into coupling and mark engagement, remove EMT/RIGID/IMC and mark half the distance of engagement, reinstall EMT/RIGID/IMC to half distance.
Cable Entry
Through conduit into expansion throat back to conduit
Finish
Enamel
Material
Steel
Material
Zinc Plated Steel
Series
Mighty-Move Expansion Coupling
Size
3 IN
Special Features
suitable for EMT/Rigid/IMC
Standard
cULus
Trade Size
3 in
Type
Coupling
Package Dimensions (L x W x H)
15.375 IN x 6.375 IN x 5.25 IN
Package Dimensions (L x W x H)
39.0525 cm x 16.1925 cm x 13.335 cm
Package Weight (Imperial)
4.716 L
Package Weight (Metric)
2.139 kg
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Frequently Asked Questions

What is the standard package quantity for the EC-300?

The standard package quantity for the EC-300 is 1 unit.

Where is the EC-300 expansion coupling manufactured?

The EC-300 is made in the USA with foreign components.

What certifications does the EC-300 coupling have?

The EC-300 meets NEMA Standard FB-1 and UL Standard UL514B.

What are the dimensions of the EC-300 coupling?

Dimension A is 12 inches and Dimension B is 3 - 1/8 inches.

What is the trade size of the EC-300 coupling?

The EC-300 expansion coupling has a trade size of 3 inches.

What material is the EC-300 coupling made from?

The EC-300 expansion coupling is made from Zinc Plated Steel.

Where is the EC-300 expansion coupling manufactured?

The EC-300 is made in the USA with foreign components.

What are the dimensions of the EC-300 coupling?

Dimension A is 12 inches and Dimension B is 3 - 1/8 inches.

What certifications does the EC-300 coupling have?

The EC-300 meets NEMA Standard FB-1 and UL Standard UL514B.

What is the standard package quantity for the EC-300?

The standard package quantity for the EC-300 is 1 unit.

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