Square D NF Panelboard Interio...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3,731.28
Square D NF Panelboard Interior, 250A Main Lugs, Cu Bus, 66-Pole, 3-Phase 4-Wire

Square D NF Panelboard Interior, 250A Main Lugs, Cu Bus, 66-Pole, 3-Phase 4-Wire

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Model: NF466L2C

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

$3,731.28
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Square D NF Panelboard Interior, 250A Main Lugs, Cu Bus, 66-Pole, 3-Phase 4-Wire

The Square D NF Panelboard Interior is a ready-to-install interior assembly rated 250A with main lugs (MLO) and a copper (Cu) bus, delivering 66 pole spaces for 3-phase, 4-wire, 600Y/347 V AC electrical systems. This versatile NF interior is field convertible to top or bottom feed and accepts bolt-on EDB, EGB, and EJB miniature circuit breakers, making it well suited for commercial buildings, industrial facilities, data centers, stadiums, and offices. Manufactured to UL 67 and CSA C22.2 standards, it provides the dependable, code-compliant power distribution professional electricians rely on.

Key Features

  • Main Lugs Rating: 250A main lugs (MLO) configuration for reliable feeder or service entrance distribution.
  • Copper Bus: Cu bus bar construction for high conductivity and long-term reliability.
  • 66 Pole Spaces: Generous 66-pole capacity supports large branch circuit counts within a single panelboard.
  • 3-Phase, 4-Wire: Configured for 3-phase, 4-wire, 600Y/347 V AC electrical distribution systems.
  • Field Convertible: Ready-to-install interior assembly is field convertible to top or bottom feed.
  • Bolt-On Breaker Compatible: Accepts bolt-on EDB, EGB, and EJB miniature circuit breakers.
  • Terminal Connections: Line and neutral lugs sized for AWG 6...350 kcmil aluminum conductors.

Certifications & Compliance

  • UL 67 Listed
  • CSA C22.2 Certified
  • ROHS EUR Compliant

Technical Specifications

  • Warranty: 18 months
  • Number Of Spaces: 66
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • ROHS Eur In Scope: Yes

Typical Applications

  • Commercial Building Electrical Distribution
  • Industrial Facility Power Systems
  • Data Center Panelboard Installations
  • Stadium and Large Venue Electrical Systems
  • Office Building Load Centers

Why Square D?

Square D NF Panelboard Interiors combine copper bus construction, bolt-on breaker compatibility, and UL 67 / CSA C22.2 certification to deliver dependable, code-compliant power distribution for demanding commercial and industrial installations. With a field-convertible, ready-to-install design and an 18-month warranty, this NF interior is built for long-term performance where reliability matters most.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Interior
Voltage Rating:
600Y/347V AC
Amperage Rating:
250A
Configuration:
Main Lugs
Standards:
UL 67, CSA C22.2
Product Material:
Copper
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers
Product Width:
10.44 in
Product Height:
57 in

Square D NF466L2C – Frequently Asked Questions

1) Will the Square D NF466L2C interior work on a 480Y/277V system?
No. The NF466L2C interior is rated 600Y/347V AC, which is the NF family's high-voltage class used for 347V lighting and 600V three-phase distribution common in Canadian and some industrial systems. On a 480Y/277V service you need an interior rated for that voltage, such as the Eaton Pow-R-Xpress PRL2X unassembled interior, which is listed as three-phase 480Y/277V. Putting a 600Y/347V interior on a 480V system is not the problem; the mismatch runs the other way, so verify the system voltage against the nameplate before ordering.
2) Which breakers fit the Square D NF 250A panelboard interior?
It takes bolt-on miniature circuit breakers in the EDB, EGB, and EJB types. Plug-on QO or Homeline breakers will not mount on this bus. The difference between EDB, EGB, and EJB is interrupting rating, so pick the type that matches the available fault current at the panel.
3) Does a main lugs panelboard interior need a separate main breaker ahead of it?
Yes. The NF466L2C is a main lugs only (MLO) interior rated 250A, so it has no integral main disconnect. Overcurrent protection and disconnecting means have to be provided upstream, at the feeder breaker or service equipment. If you need the disconnect in the panel itself, order a main breaker interior instead.
4) What size feeder conductors will the lugs on this Square D NF interior accept?
Line and neutral lugs are sized for AWG 6 through 350 kcmil aluminum conductors. That range covers a 250A aluminum feeder comfortably, and copper within the same physical range lands fine. For parallel runs or larger conductors you would need a different lug kit.
5) Will a 66-pole NF interior fit in the enclosure box I already have?
The interior measures 57 in high and 10.44 in wide, so the box has to be an NF-series enclosure with at least that usable interior height. A 66-space interior is a tall assembly, and shorter boxes used for 30 or 42 space interiors will not take it. Confirm your can height before ordering.
6) What is a panelboard interior versus a complete panelboard?
An interior is the bus assembly, lugs, and mounting pan only, not a finished panel. The NF466L2C ships as a ready-to-install interior, so you add the enclosure box, the front or trim, and the branch breakers separately. Buyers replacing a failed bus or upgrading inside an existing can order the interior; a new installation needs the box and front too.
7) What is the Eaton equivalent of the Square D NF466L2C panelboard interior?
The closest Eaton counterpart to the Square D NF466L2C is the Eaton Pow-R-Xpress PRL1X series configurable interior panelboard, which is also sold as an interior assembly rather than a complete panelboard. The Square D NF interior is rated 250A with a main lugs configuration, a copper bus, and 600Y/347V AC, and it accepts bolt-on EDB, EGB, and EJB miniature circuit breakers. The Eaton PRL1X interior is configured to order and uses Eaton's own breaker line, so breakers and accessories are not interchangeable between the two; match the system voltage and the breaker family you intend to stock before choosing.
8) Can I feed this panelboard interior from the bottom instead of the top?
Yes. The NF interior is field convertible to top or bottom feed, so the same part works whether the feeder comes down from above or up from below. No separate part number for feed direction.
9) Is the bus copper or aluminum on the Square D NF466L2C?
Copper bus. On three-phase 600Y/347V distribution with high branch circuit counts, copper is often specified outright on the drawing, so if the spec calls for Cu bus this interior meets it without substitution.
10) Is this NF panelboard interior UL listed for a commercial inspection?
It is built to UL 67 and CSA C22.2, the panelboard standards, which covers both US and Canadian inspection. That matters here because 347V lighting panels are most often installed in Canada, and the CSA certification is what the authority there will look for.
11) What are the alternatives to a Square D NF interior for a configurable panelboard build?
Eaton's Pow-R-Xpress line is the closest cross-brand equivalent in this format: the PRL1X Series configurable interior panelboard and the PRL2X unassembled interior. Keep in mind that breakers and enclosures are not interchangeable between brands, so switching from Square D NF means switching the boxes, fronts, and breakers too. If the existing building standard is NF with EDB/EGB/EJB breakers, staying with the NF interior keeps your spares pool intact.
12) How many circuits can I actually land in a 66-pole NF interior?
66 pole spaces, which is up to 66 single-pole branch circuits, 33 two-pole, or 22 three-pole breakers, or any mix within that total. At 250A main lugs on a 600Y/347V three-phase four-wire system, that pole count is why these go into office buildings, stadiums, and data centers where a lot of lighting and receptacle circuits originate from one panel.
13) Is a neutral bus included for the 4-wire configuration?
Yes, it is configured three-phase four-wire and the neutral lug is part of the interior, sized for the same AWG 6 to 350 kcmil aluminum range as the line lugs. No separate neutral kit to add for a standard 4-wire feeder.
How fast can I get the Square D NF466L2C 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 NF466L2C come with a warranty?
Absolutely. The Square D NF466L2C 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 NF466L2C?
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
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