Ilsco vs Burndy vs Panduit: Mechanical Lug Cross-Reference Guide

When you're staring at a spec sheet with an Ilsco lug called out and you've got Burndy or Panduit in stock—or your distributor only carries one brand—you need to know if you can make a direct substitution without compromising the installation or violating code. Mechanical lugs aren't interchangeable by eyeballing them, and using the wrong lug can lead to overheating, failed connections, or inspection failures. This Ilsco Burndy Panduit lug cross reference guide gives you the technical details you need to confidently substitute one brand for another based on conductor size, bolt configuration, and UL listing requirements.

Quick Answer

Ilsco, Burndy, and Panduit mechanical lugs can often be cross-referenced when they share the same conductor range, number of holes, bolt size, and UL 486A-486B listing. The key is matching wire size capacity (AWG or kcmil), barrel dimensions, tongue thickness, and bolt hole diameter rather than relying solely on part number similarity. Always verify that the replacement lug meets the same temperature rating (typically 75°C or 90°C per NEC 110.14(C)) and is listed for the same application—aluminum, copper, or dual-rated.

Understanding Mechanical Lug Specifications for Cross-Referencing

Before you attempt any cross-reference between Ilsco, Burndy, and Panduit mechanical lugs, you need to understand the critical specifications that determine compatibility. A mechanical lug isn't just a chunk of metal with a hole—it's an engineered connector with specific electrical and mechanical properties.

The primary specifications you must match include:

• Conductor Size Range: The AWG or kcmil range the lug accommodates, typically stamped on the barrel (e.g., 2/0-4/0 AWG or 250-350 kcmil)
• Number of Holes: One-hole, two-hole, or multi-hole configurations for bolting to bus bars or equipment pads
• Bolt Hole Diameter: Common sizes include 7/16", 1/2", 9/16", and 5/8" to match equipment stud sizes
• Tongue Thickness: Measured in fractions of an inch, affects fit in tight termination spaces
• Material and Plating: Copper or aluminum barrel, with tin plating common for corrosion resistance
• Temperature Rating: Usually 75°C or 90°C per NEC 110.14(C)(1), which affects ampacity calculations
• UL Listing: UL 486A (aluminum-copper connectors) or UL 486B (splicing connectors) certification is mandatory for code compliance

All three manufacturers—Ilsco, Burndy, and Panduit—produce lugs to these same UL standards, which is what makes cross-referencing possible. The challenge is that each uses different part numbering systems, so you can't just swap letters and numbers. For detailed specifications across brands, refer to our comprehensive mechanical lug cross-reference resource.

Ilsco Burndy Panduit Lug Cross Reference by Conductor Size

The most common cross-reference scenario is matching lugs by conductor size range. Here's a practical comparison table for frequently specified mechanical lugs across all three brands:

Note that "series" designations vary, and individual part numbers include suffixes for specific conductor ranges and hole configurations. For example, an Ilsco LCC250-350-2 would typically cross to a Burndy LCD250350 and a Panduit LCD250-350-X, but you must verify the exact bolt hole spacing and tongue dimensions from manufacturer cut sheets.

When working with aluminum conductors, ensure the lug is rated for aluminum per UL 486A. All three manufacturers produce aluminum-rated mechanical lugs, but not every part number is dual-rated for both copper and aluminum. Check the stamping on the lug barrel or the spec sheet—this isn't optional for NEC 110.14 compliance.

One-Hole vs Two-Hole Lug Cross-Reference Considerations

One-hole and two-hole configurations are not interchangeable without verifying the application requirements. Two-hole lugs provide better mechanical stability and are often required by equipment manufacturers for larger conductors or high-fault-current applications.

Key differences to consider:

• Mechanical Strength: Two-hole lugs distribute vibration and mechanical stress across two mounting points, critical in motor control centers and high-vibration environments
• Fault Current Considerations: Per NEC 110.10, equipment must withstand available fault current; two-hole lugs provide superior bracing
• Equipment Compatibility: Switchgear and panel bus bars often have specific hole patterns that dictate one-hole or two-hole requirements
• Torque Requirements: Two smaller bolts may have different combined torque specifications than a single larger bolt

When cross-referencing from a one-hole Ilsco lug to a Burndy or Panduit equivalent, you cannot substitute a two-hole lug unless the equipment pad accommodates it. Conversely, using a one-hole lug where two-hole is specified can violate equipment listing requirements. If you're uncertain about proper substitution for your specific application, request a quote with detailed specifications and our team can verify compatibility.

Bolt Hole Diameter and Tongue Thickness Matching

Even when conductor ranges match perfectly, dimensional mismatches in bolt holes or tongue thickness will cause installation problems. This is where cross-referencing gets granular.

Bolt hole diameters must match the equipment stud size with appropriate clearance. Standard practice per NEMA and UL guidelines:

• 3/8" stud requires 7/16" bolt hole (1/16" clearance)
• 1/2" stud requires 9/16" bolt hole
• 5/8" stud requires 11/16" or 3/4" bolt hole
• 3/4" stud requires 13/16" or 7/8" bolt hole

Tongue thickness determines whether the lug will fit between bus bar supports or in recessed termination chambers. Common tongue thicknesses range from 1/4" to 1/2". If you're replacing an Ilsco lug with 1/4" tongue thickness, a Burndy equivalent with 3/8" tongue may not physically fit the termination space, even though the electrical ratings match.

Hole spacing (distance between holes on two-hole lugs) also varies by manufacturer and conductor size. Measure center-to-center distance on the equipment pad and compare to manufacturer dimensional drawings. A 2" hole spacing won't work on a pad with 1.5" centers, regardless of how well everything else matches.

UL Listing and Temperature Rating Requirements

Every mechanical lug must carry appropriate UL listing for the application, and this is non-negotiable for code compliance under NEC 110.3(B). The two primary listings are:

• UL 486A-486B: Covers wire connectors and soldering lugs for 600V and below, which includes most mechanical lugs
• Temperature Rating: NEC 110.14(C) requires that conductor ampacity be based on the lowest temperature rating in the circuit, typically 75°C for most equipment terminations unless marked otherwise

When cross-referencing between Ilsco, Burndy, and Panduit, verify that the replacement lug carries the same UL listing. All three manufacturers clearly mark their lugs with UL certification and temperature rating, typically stamped into the barrel.

A critical note on aluminum conductors: NEC 310.12 previously restricted use of aluminum in branch circuits smaller than 1/0 AWG unless specifically listed. While this restriction was removed in recent code cycles, many engineers still specify copper-only for smaller sizes. If you're cross-referencing a copper-only lug, ensure the replacement isn't inadvertently rated for aluminum if the spec explicitly prohibits it—or vice versa. For complex specifications requiring verification, our cross-reference tool can help identify appropriate alternatives.

Installation Torque Specifications Across Brands

Mechanical lugs rely on proper bolt torque to achieve rated performance. Under-torquing creates high-resistance connections that overheat; over-torquing can crack the barrel or strip threads. Unfortunately, torque specifications vary by manufacturer even for equivalent lugs.

These values are representative ranges compiled from manufacturer installation instructions. Always reference the specific product datasheet for the lug you're installing. NEC 110.3(B) requires installation per manufacturer instructions, which means using the torque spec from Burndy if you're installing a Burndy lug, even if you cross-referenced from an Ilsco number.

Use a calibrated torque wrench—this is required by many inspection authorities and critical for warranty coverage. Re-torque lugs during final inspection, as conductors can settle after initial installation, especially with aluminum.

Frequently Asked Questions

Can I substitute a Burndy lug for an Ilsco lug on a project with approved submittals?

Technically yes, if the substitute lug meets or exceeds all specifications of the originally submitted lug—same conductor range, UL listing, temperature rating, and physical dimensions. However, many engineers require a formal substitution request with cut sheets demonstrating equivalency. Don't make the swap without documentation, as inspectors can red-tag the work even if the lug is functionally equivalent.

Are Panduit mechanical lugs compatible with Ilsco and Burndy in terms of quality?

All three manufacturers produce UL-listed mechanical lugs that meet the same ANSI and UL performance standards. Quality differences are negligible for properly specified and installed lugs. The choice often comes down to distributor availability, price, and established preferences. Each brand has specific product lines that excel in certain applications—Burndy's HYDENT series for compression, Ilsco's aluminum expertise, Panduit's integrated wiring systems—but for standard mechanical lugs, they're functionally equivalent when specifications match.

What's the difference between a mechanical lug and a compression lug for cross-referencing?

Mechanical lugs use set screws to secure the conductor, while compression lugs require crimping with a hydraulic tool and die. You cannot cross-reference between these types—a mechanical lug spec cannot be fulfilled with a compression lug and vice versa. The installation method, tooling requirements, and even the NEC articles that apply (110.14 for mechanical, 110.14 for compression but with different inspection criteria) are fundamentally different.

How do I verify a cross-referenced lug meets NEC requirements?

Check three things: UL listing mark on the lug itself (UL 486A or 486B), temperature rating stamped on the barrel (75°C or 90°C), and conductor size range. Match these to NEC 110.3(B) (listing requirement), 110.14(C) (temperature limits), and 310.15 (ampacity tables). If all three align with your circuit design, the lug meets code. Most inspection failures happen because someone used a 75°C lug termination with 90°C ampacity calculations—NEC 110.14(C)(1)(a) requires you to use the lower rating.

Where can I find dimensional drawings for Ilsco, Burndy, and Panduit lugs?

Each manufacturer provides detailed PDF cut sheets on their websites with dimensions, torque specs, and UL listings. For cross-reference work, you need these drawings to compare tongue thickness, hole spacing, and barrel length. Our mechanical lug cross-reference page consolidates links to manufacturer resources and provides side-by-side comparisons for common lug families.

Get a Quote on Cross-Referenced Mechanical Lugs

Cross-referencing mechanical lugs saves time and money when you're facing long lead times or pricing issues with a single brand, but it requires careful attention to specifications and code compliance. Conversions Tech stocks mechanical lugs from multiple manufacturers, and our technical team can verify cross-reference compatibility for your specific application. Whether you need exact replacements or approved equivalents, request a quote today with your conductor sizes, hole configuration, and quantity requirements.