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NSI Industries 387-40 - Bushing, Insulated, Grounding, Malleable Iron, Size 2-1/2 Inch, 6-250 Lug
NSI Industries

387-40

UPC: 781747038746


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Overview

The NSi Industries 387-40 is a robust Insulated Grounding Bushing constructed from durable malleable iron, designed for reliable grounding in industrial electrical systems. This bushing features a 2-1/2 inch conduit size and is engineered to accommodate a 6-250 AWG CU/AL lug for secure conductor connections. Its construction from malleable iron ensures excellent strength and resistance to corrosion, making it suitable for demanding environments. The insulated design protects conductors from abrasion and damage at conduit entry points, meeting National Electric Code requirements for conductor protection. This model is specifically designed for applications requiring a 2-1/2 inch conduit size and a lay-in lug connection for grounding jumpers to multiple metal conduits (Rigid and IMC) or for bonding metal conduit to boxes and enclosures. The insulator is rated for 150°C/302°F applications. The lay-in lug design facilitates quick installation without the need to thread the entire bushing onto the conduit, simplifying assembly, especially in confined spaces. The integrated lug design prevents it from falling off or getting lost during installation. Manufactured in the USA, the NSi Industries 387-40 provides dependable grounding and bonding solutions for critical electrical infrastructure.
  • Durable malleable iron construction for strength and corrosion resistance.
  • 2-1/2 inch conduit size with a 6-250 AWG CU/AL lug connection.
  • Insulated design protects conductors and meets NEC requirements.
  • Lay-in lug design for quick and easy installation.
  • Rated for 150°C/302°F applications.

Specifications

Application
Used with locknut to terminate service conduit to cabinet. Lug provided for bonding jumper to neutral busbar. Grounding lug: aluminum allog 6061-T6. Plastic metaliner prevents damage to wire insulation. 1/2" thru 4" rated 150 degree C, 5" and 6" rated 105 degree C.
Color
Grey with Black Insulator
Finish
Zinc Electroplated
Material
Malleable Iron
Size
2-1/2 IN
Special Features
Grounding Lug Wire Capacity #6 - #250 MCM
Standard
cULus
Temperature Rating
150?°C
Trade Size
2.5 in
Type
Bushing
Package Weight (Imperial)
0.629 L
Package Weight (Metric)
0.285 kg
Bushing, Insulated, Grounding, Malleable Iron, Size 1 Inch

383

Bushing, Insulated, Grounding, Malleable Iron, Size 1 Inch
Bushing, Insulated, Grounding, Malleable Iron, Size 1 1/2 Inch, 14-4 Lug

385-14

Bushing, Insulated, Grounding, Malleable Iron, Size 1 1/2 Inch, 14-4 Lug
Bushing, Insulated, Grounding, Malleable Iron, Size 3 1/2 Inch, 6-250 Lug

389-40

Bushing, Insulated, Grounding, Malleable Iron, Size 3 1/2 Inch, 6-250 Lug
Bushing, Insulated, Grounding, Malleable Iron, Size 1 1/4 Inch, 14-4 Lug

384-14

Bushing, Insulated, Grounding, Malleable Iron, Size 1 1/4 Inch, 14-4 Lug
Bushing, Insulated, Grounding, Malleable Iron, Size 2 Inch, 14-4 Lug

386-14

Bushing, Insulated, Grounding, Malleable Iron, Size 2 Inch, 14-4 Lug
Bushing, Insulated, Grounding, Malleable Iron, Size 3 Inch, 6-250 Lug

388-40

Bushing, Insulated, Grounding, Malleable Iron, Size 3 Inch, 6-250 Lug
Threaded Hub, Zinc Die Cast, Size 3/4 Inch

152-DC

Threaded Hub, Zinc Die Cast, Size 3/4 Inch
Threaded Hub, Zinc Die Cast, Size 1 1/4 Inch

154-DC

Threaded Hub, Zinc Die Cast, Size 1 1/4 Inch

Frequently Asked Questions

What is the standard package quantity?

The standard package quantity for this product is 25 units.

What certifications does this product have?

It is certified under Federal Specification A-A-50553, NEMA Standard FB-1, UL File E20412, and UL Standard UL-514B.

What is the trade size of this grounding bushing?

The trade size for this insulated grounding bushing is 3 1/2 inches.

What are the key dimensions of the bushing?

Dimension A is 3-1/8 inches, Dimension B is 1 inch, and Dimension C is 2-5/16 inches.

What is the purpose of the plastic metaliner?

The plastic metaliner prevents damage to wire insulation.

What material is the grounding lug made from?

The grounding lug is made from aluminum alloy 6061-T6.

What is the finish of the bushing and grounding lug?

The bushing has a Zinc electro-plate finish. The grounding lug has a Tin electro-plate finish.

What material is the bushing made from?

The bushing is made from Malleable Iron.

What is the primary use of this product?

This product is used with a locknut to terminate service conduit to a cabinet. It includes a lug for a bonding jumper to the neutral busbar.

What is the trade size of this grounding bushing?

The trade size for this insulated grounding bushing is 3 1/2 inches.

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