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Control Panel Shop

Leading Control Panel Shop in the USA – UL 508A Certified

Build-Test-Ship. Industrial, OEM & Intrinsically Safe (UL 698A) panels with full documentation, UL 508A Listing, and worldwide shipping.

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Complex industrial control panel setup

Why Choose SEI for Your Control Panels?

SEI combines NEC and UL-certified fabrication, engineering verification, and practical field experience to deliver control panels that timeensure long-term operational reliability. Our panel shop specializes in:

  • UL 508A(E161549 )and 698A (E236589)shop-built panels, and subassemblies.
  • NEMA-rated enclosures for your specific environmental needs.
  • Panel wiring & harnessing to NEC/industry best practices, and delivering quality-manufactured panels with a focus on functional safety.

What We Build

SEI - What we build - Custom control panel fabrication

Custom control panel fabrication

  • Motor control centers (MCC), VFD panels, PLC & HMI enclosures, power distribution, starter panels, relay racks, PLC skid controls, IRP panels, and pneumatic control systems.
SEI - What we build - UL 508A Certification & Compliance

UL 508A & 698A Certification & Compliance

  • UL 508Aand 698A (intrinsically safe) assembly options and documentation to speed acceptance by inspectors and electrical contractors. A UL MTR is on staff to offer guidance throughout the UL Listing process.
SEI - What we build - Shop fabrication & wiring

Shop fabrication & wiring

  • Customized layouts, in-house machining, and component mounting with identification. MTW, SIS, and multi-conductor wire types with heat-shrinkable markings created to client specifications.
SEI - What we build - Programming, FAT, & Start-up support

On-Premises Testing

  • Material verification, continuity testing, and panel power-up. Multi-voltage test bays available for complete customer inspections, Factory Acceptance Test (FAT) included.
SEI - What we build - Retrofits & Panel Upgrades

Procurement, Receiving, and Shipping

  • Components can be sourced through our network of vendors, or customer-supplied, and is subjected to our comprehensive materials tracking. Shipments are securely packaged and photographically documented for both domestic and international delivery.
SEI - What we build - Hazardous Location Panels

Custom Engraving

  • Precision-designed engravings made-to-order at our facility. Large variety of single and dual-colored ABS and burnished metal tags and legend plates available.
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Our process

  • Build: UL/NEC-compliant enclosure and panel machining and assembly, wire termination, and labeling.
  • QC: BOM verification, continuity testing, and functional power-up.
  • Testing: Multi-Voltage test bay available for our customers to approve our build before it ships.

  • Logistics: Securely crate and document the enclosures prior to shipment with tracking available upon request.

Industries we serve

  • Manufacturing
  • Water & wastewater
  • Food & beverage
  • HVAC & building automation
  • Oil & gas
  • Mining
  • Renewable energy
  • Pharmaceuticals. (Target wording to industries where you have experience; include case studies if available.)
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Technical capabilities & standards

SEI Control Panel Shop capabilities Standards

Standards

  • UL 508A, UL 698A, NEC, NEMA, (where applicable).
SEI Control Panel Shop capabilities Enclosure types

Enclosure types

  • Steel, stainless steel, polycarbonate; custom cutouts & modifications.
SEI Control Panel Shop capabilities Component brands

Component brands

  • Square D, Phoenix Contact, Allen-Bradley, ABB, Eaton-Bussmann, Hubbell
SEI Control Panel Shop capabilities Testing

Testing

  • Continuity, power-up functional checks, and and UL documentation.

Quality assurance & traceability

We maintain structured QA logs: serial numbers, material traceability, torque records, test reports, and revision control for shop drawings. Our approach reduces site delays and simplifies O&M handover.

Frequently Asked Questions

Do you manufacture panels for hazardous locations?

We can manufacture UL 698A Listed panels for use in non-classified locations that have extensions into hazardous location. For a panel meant to be installed in a hazardous location we can advise on component suitability and build to the customer’s specifications.

Do you have design and/or engineering capabilities?

While we do not offer engineering services, we do have a limited capacity to provide schematic design. Additionally, we have 3rd party partners who can assist with PLC programming and more complex schematics.

What lead time should I expect

Lead times depend on complexity and material availability. Typical ranges are 4–8+ weeks; expedited options are available for critical needs.

Can you build panels to match our existing PLC/HMI brand?

Yes, we are brand-agnostic and can assemble panels that use Allen-Bradley, Siemens, Schneider, Eaton, and other popular OEM components.

What is UL 508A and why does it matter?

UL 508A is the UL standard for industrial control panels. It demonstrates that a panel was assembled under recognized safety and quality practices, which helps with code compliance and inspector acceptance. (Show certification or file number if you have one.)

Do you manufacture panels for hazardous locations?

We can manufacture UL 698A Listed panels for use in non-classified locations that have extensions into hazardous location. For a panel meant to be installed in a hazardous location we can advise on component suitability and build to the customer’s specifications.

Do you have design and/or engineering capabilities?

While we do not offer engineering services, we do have a limited capacity to provide schematic design. Additionally, we have 3rd party partners who can assist with PLC programming and more complex schematics.

What lead time should I expect

Lead times depend on complexity and material availability. Typical ranges are 4–8+ weeks; expedited options are available for critical needs.

Can you build panels to match our existing PLC/HMI brand?

Yes, we are brand-agnostic and can assemble panels that use Allen-Bradley, Siemens, Schneider, Eaton, and other popular OEM components.

What is UL 508A and why does it matter?

UL 508A is the UL standard for industrial control panels. It demonstrates that a panel was assembled under recognized safety and quality practices, which helps with code compliance and inspector acceptance. (Show certification or file number if you have one.)

Trusted by Industry Leaders

“SEI’s custom control panels have streamlined our operations and significantly reduced downtime. Their expertise and attention to detail are unmatched.”

“Our new control panels have improved efficiency and reliability across our facility.”

At SEI, we don’t just build control panels—we build solutions that enhance efficiency, improve safety, and keep your operations running smoothly. Get in touch today to discuss your custom control panel needs.

1. Project Details

2. Panel Requirements

3. File Upload

Upload Drawings, Specifications, or RFQs (PDF, DOC, XLS, CAD accepted)

4. Additional Information

To Inquire about our services: info@sei-sjs.com
Billing Questions & Remittance Advice: accounting@sei-sjs.com
Phone: 919-362-0007

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