Panduit SPS6X28-C #6 AWG Dual-Hole Compression Lug

Panduit SPS6X28-C Compression Lug

The Panduit SPS6X28-C is a two-hole compression lug engineered for terminating #6 AWG copper conductors to 5/16" stud connections in power distribution, grounding, and battery systems. Tin-plated seamless copper barrel construction delivers NRTL-listed performance for commercial security installations, datacenter PDU feeds, UPS battery strings, and access control power distribution. The dual-stud design accommodates parallel feeds or redundant grounding paths without requiring splitters or additional hardware. Each lug ships with inspection windows that verify full conductor insertion before compression, reducing callbacks from incomplete crimps that fail pull-tests during authority-having-jurisdiction inspections.

Key Features

• Seamless tin-plated copper barrel rated for #6 AWG solid or stranded copper conductors
• Two 5/16" mounting holes on 1" centers for dual-feed or redundant grounding topology
• Inspection windows confirm full conductor seating before hydraulic compression
• cULus listed per UL 486A-486B for power and grounding applications up to 600V
• Tin plating inhibits galvanic corrosion in mixed-metal junction boxes and battery terminals
• Color-coded barrel band simplifies wire-gauge identification during rough-in inspections
• Die index markings ensure correct crimping-tool selection and prevent under-compression failures

The SPS6X28-C addresses a recurring problem in multi-building security installations: terminating #6 AWG home-runs from central UPS battery cabinets to distributed equipment closets. Standard single-hole lugs force integrators to either double-lug (code violation in many jurisdictions) or install costly split-bolt connectors when feeding parallel NVR power supplies or redundant panel feeds. This lug's factory-drilled second hole accepts a 5/16" bolt for code-compliant parallel termination, eliminating the need for field-drilled custom lugs or inspector-rejected workarounds. The 1" hole spacing matches standard terminal-block pitch on Altronix, Honeywell, and Bosch power-supply enclosures, allowing direct bolt-through mounting without adapter plates.

Tin plating over electrolytic copper provides 8-12 microinch coating thickness that prevents oxidation in unsealed J-boxes and outdoor battery enclosures. Unlike bare copper lugs that develop resistive oxide layers within 18-24 months of installation, tin-plated barrels maintain contact resistance below 100 micro-ohms through temperature cycling and humidity exposure typical of rooftop equipment shelters and below-grade vault installations. The plating also prevents galvanic corrosion when bolted directly to aluminum bus bars or cadmium-plated battery posts, a common failure mode in mixed-metal UPS installations where bare copper lugs create 0.85V electrochemical cells that accelerate terminal degradation.

Inspection windows molded into the barrel sidewall provide visual confirmation that conductor strands have bottomed-out against the lug's internal stop before compression. This feature cuts troubleshooting time during pull-test failures: instead of cutting off a suspect crimp to inspect strand engagement, technicians can verify proper insertion through the window before ever actuating the hydraulic crimper. The window also reveals partial insulation insertion, a common error when installers fail to strip conductors to the correct depth, leaving PVC jacket material inside the barrel that prevents full compression and creates a high-resistance joint that fails under load.

Die index markings embossed on the barrel specify the correct Panduit CT-series crimping die (typically CT-1240 or CT-1250 for #6 AWG). Using an incorrect die—oversized dies that under-compress the barrel, or undersized dies that deform the conductor—is the leading cause of lug failures that pass visual inspection but fail 200-lb pull tests required by NEC Article 110.14(B). The embossed index prevents this error by giving field technicians a crimp-tool setup reference that doesn't require consulting spec sheets mid-installation. Color-coded barrel bands (typically yellow for #6 AWG in Panduit's system) provide secondary gauge verification, catching wire-size errors before crimping when installers pull the wrong spool from a job-box stocked with multiple gauges.

The two-hole design supports redundant grounding topologies required by NFPA 70 Article 250 for separately derived systems. When installing isolation transformers or generator transfer switches, inspectors often require both equipment grounding conductors and separately derived system grounding conductors to terminate at the same point. Single-hole lugs force a choice between code-violating double-lugging (two conductors under one fastener, prohibited by 110.14(A) unless the lug is listed for multiple conductors) or installing a grounding bus bar as an intermediate step. The SPS6X28-C's second hole eliminates this choice: the primary grounding conductor terminates under the first bolt, the redundant or separately derived conductor under the second, both within a single UL-listed assembly that inspectors recognize as compliant hardware.

Seamless barrel construction—formed from a single copper billet without longitudinal seams—prevents the barrel-splitting failures common in rolled-and-welded economy lugs. When hydraulic crimpers apply 10-12 tons of compression force, welded seams can separate, leaving a barrel that appears properly crimped but has lost clamping force on 20-30% of the conductor's circumference. These partial-compression failures create hotspots that accelerate insulation breakdown and can ignite surrounding combustibles in enclosed equipment. Panduit's seamless extrusion process eliminates this failure mode entirely, ensuring 360-degree compression contact that distributes current evenly across all conductor strands.

cULus dual-listing covers both power distribution (UL 486A) and grounding (UL 486B) applications, simplifying material approval for installations governed by multiple code bodies. Some jurisdictions require separate UL listings for power-carrying conductors versus equipment grounding conductors; using a lug listed only under 486A for a grounding application can trigger a red-tag inspection failure even if the lug is electrically identical to a 486B-listed part. The SPS6X28-C's dual listing eliminates this ambiguity, allowing the same lug SKU to terminate both the #6 AWG feeder and its accompanying ground without requiring separate part numbers or inspector explanations.

Typical applications include terminating UPS battery interconnects to central bus bars in N+1 redundant power systems, landing generator feeder cables at automatic transfer switches in life-safety installations, grounding electrode conductors at building service entrances, and bonding conductors in separately derived 120/208V transformer installations. The lug's 600V rating supports both line-voltage power distribution and low-voltage DC battery strings up to 130VDC nominal (typical of 10-cell lead-acid UPS banks). Stud spacing and barrel length are optimized for terminal blocks in Altronix, Potter, Securitron, and Von Duprin access-control power supplies, where space constraints often prevent using oversized lugs designed for utility-scale applications.

This compression lug is supplied in bulk packaging for integration contractors managing multi-building projects where standardizing on a single lug SKU reduces inventory complexity and prevents mix-ups between similar-looking parts with different wire-gauge or stud-size ratings. Each unit includes the embossed die index, color-coded band, and inspection windows that ensure consistent field termination quality across multiple installation crews without requiring per-site engineering oversight.