Square D NQ Sub-Feed Lug Kit, ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$218.40
Square D NQ Sub-Feed Lug Kit, 400A Panelboard Accessory

Square D NQ Sub-Feed Lug Kit, 400A Panelboard Accessory

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Model: NQSFL4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$218.40
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Square D NQ Panelboard Sub-Feed Lug Kit Accessory

The Square D NQ Panelboard Sub-Feed Lug Kit is a factory-assembled, field-installable accessory rated 400 A for use with NQ and NF panelboards. Built on the modular NQ/NF platform, this kit allows contractors and end users to add sub-feed capability to an existing panelboard without replacing the entire enclosure. The kit is CSA certified and specifies a tightening torque of 6.8-7.3 N.m for conductors from AWG 1/0 through 750 kcmil, ensuring a secure, code-compliant termination for commercial and industrial electrical work.

Key Features

  • Amperage Rating: 400 A sub-feed lug kit engineered for NQ and NF panelboards.
  • Factory-Assembled Design: Ready-to-install kit that allows design flexibility and maximizes job productivity.
  • Modular Compatibility: Engineered for the NQ and NF panelboard platform, which features modular construction to accept field-installable accessories and conversion kits.
  • Tightening Torque: 6.8-7.3 N.m for AWG 1/0...750 kcmil conductors, supporting a secure and code-compliant connection.
  • Ready-to-Assemble Kit: Supports on-site design changes without extensive rework of the existing panelboard.
  • Broad Accessory Support: Part of a wide selection of accessories and replacement parts available for NQ and NF panelboards.
  • Extends Panelboard Use: Makes it easy to modify or extend the application of an existing NQ or NF panelboard installation.

Certifications & Compliance

  • CSA Certified
  • Toxic Heavy Metal Free
  • Mercury Free
  • RoHS EUR Compliant

Technical Specifications

  • Product Certifications: CSA
  • Warranty: 18 months
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • Country of Origin: Mexico
  • Packaging: 1 ea

Typical Applications

  • Commercial and Industrial Electrical Installations
  • NQ and NF Panelboard Upgrades and Modifications
  • Sub-Feed Circuit Additions to Existing Panelboards
  • Renovation and New Construction Panelboard Projects

Why Square D?

Square D backs the NQ and NF panelboard accessory line with CSA-certified components, a modular design that supports straightforward field installation, and an 18-month warranty. For contractors and end users who need to add sub-feed capability to an NQ or NF panelboard, this factory-assembled, ready-to-assemble lug kit delivers a reliable, code-compliant path to expanding panelboard capacity while minimizing on-site labor and downtime.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Accessory
Series:
NQ
Amperage Rating:
400A
Listing:
CSA
Country of Origin:
Mexico
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers

Square D NQSFL4 – Frequently Asked Questions

1) Will the Square D NQSFL4 sub-feed lug kit work in an NF panelboard, or only NQ?
The NQSFL4 sub-feed lug kit is built for both the NQ and NF panelboard platform. Both share the same modular interior construction that accepts field-installable accessories and conversion kits, so the kit mounts in either family.
2) What conductor sizes can I land in the Square D NQSFL4 sub-feed lugs, and what is the torque?
The lugs accept AWG 1/0 through 750 kcmil conductors, torqued to 6.8 to 7.3 N.m. Hit that torque on every termination, since a 400 A sub-feed is where a loose lug shows up as heat.
3) Can I add a sub-feed to an existing panelboard without swapping out the whole enclosure?
That is exactly what this kit is for. The NQSFL4 is factory assembled and field installable, so sub-feed capability gets added to a panelboard already in service instead of replacing the box and interior. Useful on renovation work where the load changed after the panel was set.
4) Is the Square D NQSFL4 lug kit rated for 400 amps?
400 A is the kit's rating, so the sub-feed it creates cannot be protected or loaded above that. If the downstream feeder needs more than 400 A, this is the wrong kit and you need a higher-rated sub-feed provision.
5) I need to add capacity to an existing panelboard without replacing the enclosure. Which kit does that?
The Square D NQSFL4 sub-feed lug kit is the one built for that: it is a factory-assembled, field-installable 400A kit that adds sub-feed capability to an existing NQ or NF panelboard without replacing the enclosure. The ABB accessories in the same family of parts serve other purposes, such as the ABB NKA8474 200 percent neutral kit for Pro-Stock merchandise lighting panelboards and the ABB 569B806G circuit numbering strip, neither of which adds a sub-feed tap.
6) Is this Square D sub-feed lug kit acceptable for work in Canada?
The NQSFL4 is CSA certified, which is the listing Canadian inspectors look for. Country of origin is Mexico.
7) What exactly ships in the Square D NQSFL4 order, and what part number do I quote?
Order by Square D part number NQSFL4. It ships one kit per package, factory assembled and ready to mount. Feeder conductors and any downstream overcurrent device are separate.
8) Does a sub-feed lug kit give me a second breaker, or just lugs?
Just lugs. A sub-feed lug kit taps the main bus and gives you terminations to feed another panel or device downstream; the overcurrent protection for that feeder lives elsewhere. If you want the tap breaker-protected out of the panel, you want a sub-feed circuit breaker arrangement instead of this lug kit.
9) Can an ABB A Series panelboard accessory be used in place of the Square D NQSFL4?
Not for a sub-feed. The ABB 569B806G is a circuit numbering strip for PNBD panelboards, an identification part, while the Square D NQSFL4 is a 400A sub-feed lug kit that provides conductor terminations for AWG 1/0 through 750 kcmil at 6.8-7.3 N.m. Different ABB A Series accessories are also engineered for ABB enclosures, whereas the NQSFL4 is engineered for the Square D NQ and NF platform.
10) Is there an environmental or spec compliance sheet on this kit for a green building submittal?
The kit is declared toxic heavy metal free, mercury free, and RoHS EUR compliant, alongside its CSA certification. Those are the points that usually get asked for on institutional and LEED-oriented submittals.
11) Will a 200% neutral kit or numbering strip do the same job as this sub-feed lug kit?
No, different functions entirely. The ABB NKA8474 200% neutral kit upsizes neutral capacity on Pro-Stock lighting panelboards, and the ABB A Series circuit numbering strip is an identification accessory for PNBD panelboards. Neither creates a feeder tap. Only a sub-feed lug kit like the NQSFL4 adds a 400 A downstream termination point.
How fast can I get the Square D NQSFL4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D NQSFL4 come with a warranty?
Absolutely. The Square D NQSFL4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D NQSFL4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Square D NQSFL4 from ZenSupply?
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