Case Study · Commercial & Industrial

Switchboards for three Hawaii projects, including Puainako Mall

Built for three Hawaii projects, including Puainako Mall

Jun 2026 – Oct 2026

Key facts

The build at a glance

3 switchboards

Units

Utility-metered service switchboards and a solar AC-combiner switchboard

Product

3000A bus with a 2000A main; 2000A; 400A

Amperage

208Y/120V and 480Y/277V

Voltage

Tin-plated aluminum

Bus

NEMA 3R, NEMA 1 and NEMA 4X stainless steel

Enclosure

65 kAIC

Interrupting rating

UL 891 low-voltage

Listing

Siemens WL and 3VA mains; Siemens 3VA and BQD feeders

Breakers

Jurupa Valley, California

Built in

01 · Challenge

The challenge

Three projects on three islands, each with its own requirements: Puainako Mall needed a 3000A-bus meter-main with a utility pull section and a CT metering compartment in an outdoor NEMA 3R enclosure; a second site needed a 2000A service switchboard with utility metering and a key-interlocked generator breaker; and a coastal solar site needed a 400A switchboard in NEMA 4X stainless steel to combine its inverters’ AC output.

02 · Build

What DEI built

For the shopping center, a four-section UL 891 low-voltage meter-main switchboard: 3000A bus, a 2000A Siemens WL main with arc-energy reduction, 208Y/120V, 65 kAIC, tin-plated aluminum bus and a NEMA 3R outdoor enclosure, with a utility pull section, a CT metering compartment and 16 Siemens feeder breakers from 20A to 1200A. For the second site, a four-section 2000A UL 891 low-voltage service switchboard at 480Y/277V: a Siemens WL 2000A LSIG main, 100% rated, key-interlocked with a Siemens WL generator breaker so only one source can be closed at a time, a utility pull section and CT compartment, eight Siemens 3VA feeders up to 800A, 65 kAIC, tin-plated aluminum bus, NEMA 1 indoors. For the solar site, a 400A UL 891 low-voltage switchboard at 208Y/120V with a Siemens 3VA main, two 200A feeders and tin-plated aluminum bus in a NEMA 4X stainless-steel enclosure; it combines the AC output of the site’s inverters.

QtyItemRatingVoltageEnclosureBusNotes
1Meter-main switchboard3000A bus, 2000A main208Y/120V 3Ø 4WNEMA 3RAluminum, tin-platedFour sections with a utility pull section and CT metering compartment; Siemens WL 2000A main with arc-energy reduction; 16 Siemens 3VA and BQD feeders, 20A to 1200A; 65 kAIC; UL 891 low-voltage
1Service switchboard2000A480Y/277V 3Ø 4WNEMA 1Aluminum, tin-platedSiemens WL 2000A LSIG main, 100% rated, key-interlocked with a Siemens WL generator breaker; utility pull section and CT compartment; eight Siemens 3VA feeders up to 800A; 65 kAIC; UL 891 low-voltage
1Solar inverter AC-combiner switchboard400A208Y/120V 3Ø 4WNEMA 4X stainless steelAluminum, tin-platedSiemens 3VA 400A main; two Siemens 3VA 200A feeders and two BQD 15A breakers; combines the inverters’ AC output; 65 kAIC; UL 891 low-voltage

03 · Delivery

How DEI delivered

This rail shows all 3 orders together: a step reads Done when every order has passed it. Remaining orders: expected ship through Q4 2026.

Done
Order
Done
Engineering
In progress · Sep 2026
Fabrication & bus bar
In progress · Sep 2026
Assembly
In progress · Sep 2026
QC
Expected ship Q4 2026
Shipped

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

The shopping-center meter-main has been delivered. As of September 2026 the second site’s service switchboard is in assembly, and the solar board, quoted at eight weeks from the signed submittal, is in bus-bar fabrication.

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

04 · Result

The result

Three boards for three islands, each enclosure matched to its site: NEMA 3R outdoors at the shopping center, NEMA 1 indoors at the second site, and NEMA 4X stainless steel at the coastal solar site.

05 · Specifications

Specifications, build by build

Build 1 of 3 — Shopping center — 3000A meter-main switchboard

From DEI’s submittal, Jun 2026

QtyItemRatingVoltageEnclosureBusNotes
1Meter-main switchboard3000A bus, 2000A main208Y/120V 3Ø 4WNEMA 3RAluminum, tin-platedFour sections with a utility pull section and CT metering compartment; Siemens WL 2000A main with arc-energy reduction; 16 Siemens 3VA and BQD feeders, 20A to 1200A; 65 kAIC; UL 891 low-voltage
  • UL 891 low-voltage meter-main switchboard, 3000A bus, 208Y/120V, 3-phase 4-wire, 65 kAIC
  • Four sections, 162 in. (13.5 ft) end to end: a utility pull section, a main section and two 3000A distribution sections, with the utility CT compartment and meter plates
  • Siemens WL 2000A main breaker with arc-energy reduction (NEC 240.87)
  • 16 Siemens 3VA and BQD feeder breakers from 20A to 1200A; the 1200A feeder adds arc-energy reduction, an undervoltage release and a padlock device
  • Tin-plated aluminum bus sized for a 65°C rise; aluminum ground bus; front-accessible terminations
  • NEMA 3R outdoor enclosure in ANSI 61 light gray
  • Delivered

From DEI’s submittal, Jun 2026

QtyItemRatingVoltageEnclosureBusNotes
1Service switchboard2000A480Y/277V 3Ø 4WNEMA 1Aluminum, tin-platedSiemens WL 2000A LSIG main, 100% rated, key-interlocked with a Siemens WL generator breaker; utility pull section and CT compartment; eight Siemens 3VA feeders up to 800A; 65 kAIC; UL 891 low-voltage
  • UL 891 low-voltage service switchboard, 2000A, 480Y/277V, 3-phase 4-wire, 65 kAIC
  • Siemens WL 2000A LSIG main, 100% rated, with arc-energy reduction
  • Siemens WL generator breaker, key-interlocked with the main so only one source can be closed at a time
  • Four sections, including a utility termination and pull section, a CT compartment and meter plates
  • Eight Siemens 3VA feeder breakers up to 800A
  • Tin-plated aluminum bus sized for a 65°C rise; NEMA 1 indoor enclosure

From DEI’s submittal, Sep 2026

QtyItemRatingVoltageEnclosureBusNotes
1Solar inverter AC-combiner switchboard400A208Y/120V 3Ø 4WNEMA 4X stainless steelAluminum, tin-platedSiemens 3VA 400A main; two Siemens 3VA 200A feeders and two BQD 15A breakers; combines the inverters’ AC output; 65 kAIC; UL 891 low-voltage
  • UL 891 low-voltage switchboard, 400A, 208Y/120V, 3-phase 4-wire, 65 kAIC
  • Combines the AC output of the solar site’s inverters
  • Siemens 3VA 400A main; two Siemens 3VA 200A feeders; 15A three-pole and two-pole BQD breakers, changed per the engineer’s comments before release
  • Tin-plated aluminum bus sized for a 65°C rise; front-accessible terminations
  • NEMA 4X stainless-steel enclosure for outdoor use
  • Quoted at eight weeks from the signed submittal

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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Jurupa Valley CA 92509

Contact Info

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

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