Most commercial buildings in Arizona built between 1985 and 2005 are running on panelboards that pre-date arc-flash mitigation, modern SCCR (Short-Circuit Current Rating) compliance, and the 2017+ NEC requirements for surge protective devices, AFCI on dwelling-unit lines in mixed-use, and labeled service-equipment SPD coordination. If you're a property manager, facility engineer, or contractor scoping a panelboard upgrade for a 5,000–80,000 sq ft commercial building in the Phoenix metro, this guide walks through what you should expect.
Quick price snapshot — Phoenix metro, 2026
| Scope | Typical cost | Timeline (incl. lead times) |
|---|---|---|
| Replace 225A 42-circuit panelboard (like-for-like, Square D NQ/NF) | $4,500 – $7,500 | 2–4 weeks total |
| Replace + relocate 400A 84-circuit panelboard (Eaton PRL) | $11,000 – $18,500 | 4–6 weeks total |
| 800A or 1200A panelboard with 65kA SCCR upgrade (Square D I-Line, Eaton Pow-R-Line) | $28,000 – $52,000 | 6–10 weeks total |
| Add: arc-flash study, labeling per NFPA 70E | + $1,800 – $4,500 | + 1–2 weeks |
| Add: NEMA 3R outdoor enclosure rated for AZ heat / dust | + $1,200 – $3,800 | + 1–3 weeks lead |
These ranges assume panelboard only — feeder upgrades, conduit re-runs, or service-entry swaps add separate scopes. A complete 800A panelboard plus matched switchboard upgrade typically lands $65–110k for a mid-size commercial property.
When you actually need to replace, not just refurbish
We get asked frequently if a panelboard can be "just rebuilt" — new breakers, cleaned bus, refastened lugs. The answer is sometimes yes, but here are the conditions that mandate full replacement:
- Bus damage — pitting, discoloration, or arc tracking on the copper or aluminum bus. Once the bus is compromised, fault currents won't clear cleanly and the entire panel becomes a fire hazard.
- SCCR insufficient for the available fault current — modern utility services in Phoenix metro often deliver 22kA – 42kA available fault current. A 1980s panelboard rated for 10kA SCCR can't clear that fault without component damage. The NEC requires SCCR to match or exceed the available fault current at the panel terminals.
- Obsolete breaker line — Federal Pacific Stab-Lok, Zinsco, Pushmatic, and certain Wadsworth lines are no longer manufactured. Replacement breakers come from refurbished stock with unknown trip curves. Don't put a $2 refurbished breaker in front of a $40,000 mainframe.
- Insulation degradation — wire insulation around the panel feeders cracking, browning, or showing nylon failure. Heat over decades destroys insulation; the panel itself may look fine but the connections are time bombs.
- Code violations from the original install — undersized neutral bus, missing equipment ground bar, improper barrier between line and load sides. If the AHJ tags it on a re-inspection, the panel has to come out.
- Tenant load growth — original 400A panelboard installed for a single tenant now feeds three tenant suites. Diversified demand exceeds capacity. Time for a new panel sized correctly.
Square D, Eaton, Siemens — choosing the right panelboard line
Tech Energy America is an authorized distributor for the three dominant commercial panelboard manufacturers. Here's how we recommend choosing in 2026:
Square D NQ / NF (200A – 1200A panelboards)
The most popular commercial panelboard in the U.S. NQ is for branch-circuit panelboards (smaller breakers); NF is for distribution panelboards (larger frames). Square D's big advantages: best-in-class availability of breakers (you can find a QO breaker at any supply house in Arizona on a Saturday), strong AFCI / GFCI lineup, and excellent integration with their I-Line column busway for industrial work. Stock 225A NQOD42 enclosed panelboards typically ship same-day from Tech Energy America's Scottsdale warehouse.
Eaton PRL series (Pow-R-Line 1, 2, 3, 4)
Eaton panelboards have the deepest line-up at higher amperage. PRL-1 covers 225–600A; PRL-3 covers 800–1200A; PRL-4 goes to 2000A. Eaton wins when you need UL 1558 switchboard-rated equipment or a 65kA SCCR factory-default — their stock panels routinely ship with the higher SCCR without surcharge, where Square D requires upgraded series-rated combinations.
Siemens P1, P2, P3, P4
Siemens panelboards are the "industrial spec" choice — common in manufacturing, water/wastewater, and government projects. They ship with copper bus standard (vs aluminum on the lower-end competitors), have excellent thermal-magnetic breaker performance, and integrate cleanly with Siemens motor-control centers. Stock availability in Arizona is lower than Square D or Eaton, so 2–4 week lead times are normal for non-standard configurations.
For a deeper comparison see our Square D vs Eaton vs Siemens panelboard comparison post.
Code requirements that drive 2026 replacement scope
Arizona has adopted the NEC 2020 statewide (with some 2017 holdouts) and the City of Phoenix has adopted portions of NEC 2023. When you replace a commercial panelboard, the AHJ requires you to bring it up to current code, even if other parts of the building remain on older code. Key 2023 requirements that affect panelboard work:
- NEC 230.67 — Surge Protective Device (SPD) required on every commercial service. Type 1 at the service entrance, Type 2 cascaded at large distribution panels.
- NEC 408.43 — Panelboards must include a means of disconnect within sight of the panelboard for service work. On many existing installs this means adding a fused disconnect or molded-case switch upstream.
- NFPA 70E (2024) — Arc-flash hazard labels required on all panelboards above 240V or above 100A. The labels must be specific to the calculated incident energy at that location — generic stickers don't comply.
- SCCR labeling — Panelboards must be labeled with their SCCR, and that rating must match or exceed the available fault current at the bus.
- AFCI on dwelling-unit branch circuits — applies to mixed-use buildings where a panelboard feeds residential units (apartments above commercial). Often forces a panelboard line change to a model that accepts AFCI breakers.
What a complete commercial panelboard upgrade includes
A proper commercial electrical contracting scope from Tech Energy America covers:
- Site walk + existing-condition documentation — photos of every connection, breaker schedule pulled from the existing panel, feeder size verification
- Load calculation per NEC 220 with diversified demand factors appropriate to the building type
- Short-circuit / available fault current study — required to size the SCCR correctly. We coordinate with APS / SRP for utility transformer impedance values when needed.
- Arc-flash study + NFPA 70E labels — optional but strongly recommended; required for many commercial insurance policies
- Permit + plan submission to the AHJ — Phoenix, Tempe, Scottsdale, Mesa, Chandler all have separate plan-review desks for commercial
- Panelboard procurement — Square D / Eaton / Siemens through Tech Energy America's distribution channels, with lead times locked at order
- Demolition + new install — coordinated outage scheduling, temporary power if needed, weekend or after-hours work for occupied tenant spaces
- Feeder verification + termination torque to manufacturer spec — every lug torqued to the spec on the panel rating label, documented in the turnover packet
- Breaker installation + branch circuit re-identification — new panel directory, labeled per NEC 408.4
- Megger test on feeders, insulation resistance verification, polarity check
- Final inspection + arc-flash label installation + as-built drawings to the building owner
Lead times — what to plan for in 2026
Supply-chain pressure on commercial electrical equipment has eased since 2022, but lead times still vary significantly:
| Equipment | Stock (Scottsdale) | Factory order |
|---|---|---|
| Square D NQOD 225A, 42ckt | Same week | 3–4 weeks |
| Eaton PRL-1 400A, 84ckt | 1–2 weeks | 5–7 weeks |
| Square D I-Line 800A switchboard | — | 10–14 weeks |
| Siemens P3 1200A, custom config | — | 14–22 weeks |
| JST Power transformer (custom kVA) | Common ratings stocked | 8–12 weeks |
Tech Energy America also manufactures UL-listed switchgear in-house when commercial OEM lead times are blocking a project. We can build a panelboard equivalent in 4–8 weeks for many specs, which is sometimes 6–14 weeks faster than ordering from the original OEM. See our self-mfg lineup.
Common scenarios we see in Phoenix metro
Tenant fit-out triggers a panelboard upgrade
A coffee shop or restaurant tenant moves into a retail space originally built for clothing retail. The new tenant has a 100A panelboard sized for HVAC + lighting + a few receptacles. Their actual demand for an espresso machine, dishwasher, two convection ovens, and a walk-in freezer is closer to 200A. We replace the tenant panel with a 200A panelboard, run a new feeder from the building main switchgear, and pull a tenant improvement permit.
Industrial plant adds a new production line
An existing 400A panelboard fed three CNC machines and the plant air compressor. The owner adds a fourth CNC with a 60A 480V three-phase feed. The existing panelboard either runs out of breaker space or runs out of bus ampacity. We upsize to an 800A panelboard with a matched feeder pull from the main switchboard, coordinate the outage for a weekend, and bring everything online by Monday morning.
Solar PV interconnection requires panelboard SCCR upgrade
A commercial solar EPC wants to interconnect a 200kW PV array at a building's main panelboard. The available fault current with PV connected pushes past the existing panel's 25kA SCCR. The interconnection won't be approved without upgrading the panelboard. We size a 65kA SCCR panel with the correct overcurrent protection, do the line-side tap, and get the utility sign-off.
How we keep panelboard upgrades on schedule
The two killers of commercial panelboard projects are lead times and tenant outages. Tech Energy America addresses both with:
- Pre-ordering long-lead components at quote acceptance — we order the panel as soon as the PO is signed, even if installation is 6 weeks out, so the panel sits in our warehouse rather than slipping the schedule.
- Saturday / Sunday / overnight outages — for occupied commercial buildings, we work around tenant hours. Most full panelboard swaps can complete inside a Saturday window for 200A–400A; larger jobs sometimes need two weekends.
- Pre-fabrication — when feeder routing and conduit runs allow, we pre-fab feeders to length, label them, and install everything cold on outage day. This compresses the outage window dramatically.
Common questions
Does my insurance require an arc-flash study?
Most commercial property and general liability policies in 2026 require an arc-flash hazard analysis on any electrical equipment 250V or higher. If yours doesn't require one yet, your next renewal cycle probably will. Doing it during a panelboard upgrade is the cheapest moment to add it.
Can you finance panelboard upgrades?
We don't directly finance — but we work with several Phoenix-metro commercial equipment financiers who lend specifically for code-compliance electrical upgrades, with 24–60 month terms. Ask for a referral when you request a quote.
What about LEED / energy efficiency requirements?
Modern panelboards include power monitoring options (Square D PowerLogic, Eaton Magnum, Siemens SENTRON). Adding revenue-grade metering at the panelboard often qualifies for utility energy-efficiency rebates from APS Solutions for Business or SRP Business Solutions. We coordinate the rebate paperwork as part of the upgrade.
Will the panelboard upgrade increase my building's value?
For multi-tenant commercial buildings in the Phoenix metro, modernized electrical infrastructure documented with arc-flash labels and current SCCR ratings adds verifiable value at sale or refinance. Commercial appraisers explicitly call out "modernized electrical service" as a positive condition adjustment.
Related reading
- More articles on the Tech Energy America blog
- Square D vs Eaton vs Siemens panelboards compared
- UL switchgear lead times — how to plan around them
- Commercial electrical contracting in AZ & NM
- Wholesale distribution — Square D, JST, CME, Priority Wire, Southwire
Need a commercial panelboard upgrade quote?
Tech Energy America is an authorized electrical distributor for Square D, Eaton, and Siemens. We respond to RFQs within 24–48 hours and pre-order long-lead equipment at PO acceptance to lock in the schedule.
📞 Call (480) 910-0867✉ Email Quote