Built for Rosendin Electric, for OpenAI
Delivered Sep 2026 a six-figure order
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Built in
For OpenAI, Rosendin Electric needed three 480Y/277V distribution switchgear lineups, the largest at 4000A, built to the project’s submittal.
Three UL 891 low-voltage switchgear lineups in switchboard construction: 4000A, 3000A and 1200A, all at 480Y/277V three-phase four-wire, 65 kAIC, NEMA 1, with tin-plated aluminum bus. The 3000A lineup feeds four 1600A breakers with LSIG trip units and Dynamic Arc Flash Sentry; the 1200A lineup takes a 1000A main. Mains and feeders are Siemens WL insulated-case and 3VA molded-case breakers.
| Qty | Item | Rating | Voltage | Enclosure | Bus | Notes |
|---|---|---|---|---|---|---|
| 1 | Switchgear lineup | 4000A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | Siemens WL main; 65 kAIC; UL 891 low-voltage |
| 1 | Switchgear lineup | 3000A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | Four 1600A LSIG feeders with Dynamic Arc Flash Sentry; 65 kAIC |
| 1 | Switchgear lineup | 1200A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | 1000A Siemens 3VA main; 65 kAIC |
Engineered, fabricated and assembled under one roof in Jurupa Valley, California.
The order was placed in June 2026 and the three lineups shipped together in September 2026, about 13 weeks from order to shipment. DEI’s engineers revised the submittal drawings in July 2026; fabrication and bus bar work ran in August, assembly ran from August into September, and QC and shipment followed in September.
Three switchgear lineups up to 4000A, engineered and built by DEI and shipped together in September 2026, about 13 weeks after the order.
From DEI’s submittal, Jul 2026
| Qty | Item | Rating | Voltage | Enclosure | Bus | Notes |
|---|---|---|---|---|---|---|
| 1 | Switchgear lineup | 4000A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | Siemens WL main; 65 kAIC; UL 891 low-voltage |
| 1 | Switchgear lineup | 3000A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | Four 1600A LSIG feeders with Dynamic Arc Flash Sentry; 65 kAIC |
| 1 | Switchgear lineup | 1200A | 480Y/277V 3Ø 4W | NEMA 1 | Aluminum, tin-plated | 1000A Siemens 3VA main; 65 kAIC |
10 orders in 7 weeks
UL 891 low-voltage switchboards from 600A to 3000A, plus panelboard and transformer packages.
Jul 2026 – Oct 2026
1200A board shipped in 20 days
1200A UL 891 low-voltage switchboards for a semiconductor manufacturer; one shipped 20 days after the order.
Jul 2026 – Sep 2026
4000A meter-main service
UL 891 low-voltage meter-main switchgear at 480Y/277V, 65 kAIC, with utility metering and protective relaying.
Delivered Sep 2026
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.
Office Location
4725 Troy Ct.
Jurupa Valley CA 92509
Contact Info
Phone: +1 (866) 773-8050
Email: sales@deipower.com
