Case Study · Distributors & Utilities

Eight switchboard orders through City Electric Supply

Built for City Electric Supply, for job sites from the West Coast to the Midwest

Jul 2026 – Oct 2026 a six-figure program

Key facts

The build at a glance

8 orders: 10 switchboards and a panelboard

Orders

Service, meter-main and main-lug-only switchboards; one panelboard

Product

400A to 2000A

Amperage

480Y/277V, 208Y/120V, 240/120V and 240V

Voltage

Aluminum on seven of the eight orders (tin-plated on the newest)

Bus

NEMA 3R outdoor switchboards; NEMA 1 indoor panelboard

Enclosure

65 kAIC; 100 kAIC main breaker on the 2000A board

Interrupting rating

UL 891 low-voltage (switchboards)

Listing

Siemens WL, 3WA, 3VA and BQD

Breakers

Just over seven weeks from purchase order to shipment (two 800A boards, July to September 2026)

Turnaround

Jurupa Valley, California

Built in

01 · Challenge

The challenge

A distributor’s orders arrive one job at a time, each with its own rating, voltage and site. In 2026, City Electric Supply placed 8 orders with DEI for job sites from the West Coast to the Midwest. Six came through one specialty office and two through local branches. They ran from a 400A meter-main to a 2000A meter-main, and six of them specified a CT metering compartment for the utility serving the site.

02 · Build

What DEI built

The orders include a pair of 800A main-lug-only switchboards at 208Y/120V, each with thirteen 100A two-pole branch breakers, and a 400A meter-main at 240V with a 400A main and two 200A branch breakers for a retail center. The other six are three 1600A switchboards at 480Y/277V, each with a utility CT compartment, one of them ordered with an 800A service-entrance board alongside; a 400A meter-main at 240/120V high-leg delta with a utility CT compartment and two 200A feeders; a 2000A meter-main at 480Y/277V with a Siemens 3WA main rated 100 kAIC and 27 distribution breakers; and an 800A service-entrance switchboard paired with an indoor 400A panelboard. Every switchboard is an outdoor NEMA 3R, UL 891 low-voltage board rated 65 kAIC, and seven of the eight orders specify aluminum bus.

OrderScopeRatingVoltageStatus
11600A switchboard with two 800A feeders1600A; 80A480Y/277V 3Ø 4WAssembly · expected ship Q4 2026
21600A and 800A switchboards1600A; 800A MCB480Y/277V 3Ø 4WAssembly · expected ship Q4 2026
31600A switchboard with utility CT metering1600A480Y/277V 3Ø 4WAssembly · expected ship Q4 2026
4Two 800A main-lug-only boards800A208Y/120V 3Ø 4WDelivered Sep 2026
5400A meter-main with utility CT compartment400A240/120V 3Ø 4W high-leg deltaFabrication & bus bar · expected ship Q4 2026
6Retail center — 400A meter-main400A240V 3Ø 4WDelivered
72000A meter-main, 100 kAIC main breaker2000A480Y/277V 3Ø 4WEngineering · expected ship Q4 2026
8800A switchboard and 400A panelboard800A MCB; 400A MCB, 42 circuits480Y/277V 3Ø 4WOrder placed · expected ship Q4 2026

Line-by-line specifications for every order are in the accordion below.

03 · Delivery

How DEI delivered

This rail follows Order 4 of 8, shipped Sep 2026. Remaining orders: expected ship through Q4 2026.

Jul 2026
Order
Done
Engineering
Aug 2026
Fabrication & bus bar
Sep 2026
Assembly
Sep 2026
QC
Sep 2026
Shipped

Engineered, fabricated and assembled under one roof in Jurupa Valley, California.

Two orders had shipped by September 2026: the pair of 800A main-lug-only boards, just over seven weeks after the distributor’s purchase order, and the 400A retail-center meter-main. Of the rest, the three 1600A orders are in assembly, the second 400A meter-main is in bus-bar fabrication, the 2000A meter-main and the newest order are in engineering.

DEI’s facility in Jurupa Valley, California
Photographed at DEI’s shop, Jurupa Valley, California.

04 · Result

The result

One distributor, 8 orders for job sites from the West Coast to the Midwest, each engineered to its own site in one shop: a six-figure program.

05 · Specifications

Specifications, build by build

Build 1 of 8 — 1600A switchboard with two 800A feeders

QtyItemRatingVoltageEnclosureBusNotes
1Switchboard1600A480Y/277V 3Ø 4WNEMA 3RAluminumTwo 800A Siemens 3VA distribution breakers; 200kA surge protective device; utility CT compartment; 65 kAIC; UL 891 low-voltage
1Fused disconnect80ANEMA 3ROrdered with the switchboard
  • UL 891 low-voltage switchboard, 1600A, 480Y/277V, 3-phase 4-wire, 65 kAIC, NEMA 3R, aluminum bus
  • Two 800A Siemens 3VA distribution breakers; 200kA surge protective device; utility CT compartment
  • 80A fused disconnect, NEMA 3R
QtyItemRatingVoltageEnclosureBusNotes
1Switchboard1600A480Y/277V 3Ø 4WNEMA 3RAluminumSiemens WL main; one 800A Siemens 3VA distribution breaker plus a provision for a second; 200kA surge protective device; utility CT compartment; 65 kAIC; UL 891 low-voltage
1Switchboard, service entrance800A MCB480Y/277V 3Ø 4WNEMA 3RAluminumSiemens 3VA main; one 200A and five 100A branch breakers; 65 kAIC; UL 891 low-voltage
  • UL 891 low-voltage switchboard, 1600A, Siemens WL main, 480Y/277V, NEMA 3R
  • One 800A Siemens 3VA distribution breaker plus a provision for a second; 200kA surge protective device; utility CT compartment
  • UL 891 low-voltage 800A main-breaker switchboard, service-entrance rated, 480Y/277V, NEMA 3R, Siemens 3VA main, one 200A and five 100A branch breakers
  • 65 kAIC; aluminum bus; Build America, Buy America (BABA) compliant per DEI’s submittal
QtyItemRatingVoltageEnclosureBusNotes
1Switchboard with utility CT compartment1600A480Y/277V 3Ø 4WNEMA 3RAluminum65 kAIC; BABA compliant per DEI’s submittal; UL 891 low-voltage
  • UL 891 low-voltage switchboard, 1600A, 480Y/277V, 3-phase 4-wire, 65 kAIC, NEMA 3R, aluminum bus
  • Utility CT metering compartment for the serving utility
  • Build America, Buy America (BABA) compliant per DEI’s submittal

From DEI’s submittal, Jul 2026

QtyItemRatingVoltageEnclosureBusNotes
2Switchboard, main lug only800A208Y/120V 3Ø 4WNEMA 3RAluminumThirteen 100A two-pole Siemens BQD branch breakers each; 65 kAIC; UL 891 low-voltage
  • 2 × UL 891 low-voltage switchboards, 800A main lug only, 208Y/120V, 3-phase 4-wire
  • Thirteen 100A two-pole Siemens BQD branch breakers per board
  • 65 kAIC; NEMA 3R; aluminum bus; Build America, Buy America (BABA) compliant per DEI’s submittal
  • Ordered July 2026; shipped September 2026
QtyItemRatingVoltageEnclosureBusNotes
1Meter-main switchboard400A240/120V 3Ø 4W high-leg deltaNEMA 3RAluminumSiemens 3VA main; two 200A feeders; utility CT compartment; 65 kAIC; UL 891 low-voltage
  • UL 891 low-voltage meter-main switchboard, 400A, 240/120V, 3-phase 4-wire high-leg delta, 65 kAIC, NEMA 3R, aluminum bus
  • Siemens 3VA 400A main; two 200A feeders; utility CT compartment
QtyItemRatingVoltageEnclosureBusNotes
1Meter-main switchboard400A240V 3Ø 4WNEMA 3R400A main and two 200A branch breakers, 65 kAIC; utility CT compartment; UL 891 low-voltage
  • UL 891 low-voltage meter-main switchboard, 400A, 240V, 3-phase 4-wire, 65 kAIC, NEMA 3R
  • 400A three-pole main and two 200A three-pole branch breakers; utility CT compartment
  • Delivered
QtyItemRatingVoltageEnclosureBusNotes
1Meter-main switchboard2000A480Y/277V 3Ø 4WNEMA 3RAluminumSiemens 3WA main, LSIG with Dynamic Arc Flash Sentry, 100 kAIC; 27 Siemens 3VA distribution breakers; 200kA surge protective device; utility CT compartment; UL 891 low-voltage
  • UL 891 low-voltage meter-main switchboard, 2000A, 480Y/277V, 3-phase 4-wire, NEMA 3R, aluminum bus
  • Siemens 3WA 2000A main, LSIG with Dynamic Arc Flash Sentry, 100 kAIC
  • 27 Siemens 3VA distribution breakers (22 at 50A, 5 at 100A); 200kA surge protective device; utility CT compartment
  • Build America, Buy America (BABA) compliant per DEI’s submittal
QtyItemRatingVoltageEnclosureBusNotes
1Switchboard, service entrance800A MCB480Y/277V 3Ø 4WNEMA 3RAluminum, tin-platedSiemens 3VA main; nine distribution breakers; 65 kAIC; UL 891 low-voltage
1Panelboard400A MCB, 42 circuits480Y/277V 3Ø 4WNEMA 1 (indoor)Aluminum, tin-platedSiemens 3VA main; five distribution breakers; service-entrance rated; bottom fed; 65 kAIC
  • UL 891 low-voltage switchboard, 800A main breaker, service-entrance rated, 480Y/277V, 65 kAIC, NEMA 3R, tin-plated aluminum bus
  • Siemens 3VA 800A main; nine distribution breakers (seven 100A three-pole, two 15A)
  • One section, about 30 in wide, 31 in deep and 90 in high
  • 400A main-breaker panelboard, 480Y/277V, 42 circuits, 65 kAIC, service-entrance rated, NEMA 1 indoor, bottom fed, tin-plated aluminum bus

06 · Related

Related case studies

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Company names identify who DEI’s orders are for. Their use does not imply endorsement of DEI.

Dates, quantities and turnarounds as of September 2026, from DEI’s build and order records. Images are representative unless marked otherwise.

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Office Location

4725 Troy Ct.
Jurupa Valley CA 92509

Contact Info

Phone: +1 (866) 773-8050
Email: sales@deipower.com

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