Phoenix & Maricopa County
Commercial EV Charging Installation in Phoenix
Level 2 and DC fast charging designed around the service you actually have, the utility that actually serves you, and the code the city actually enforces.
Most commercial EV charging quotes fail in the same two places: the utility side, which nobody controls, and the service capacity, which almost nobody measures before assuming it is short. We design and build Level 2 and DC fast charging across Phoenix and Maricopa County, and we start by proving what the existing service will carry under NEC 220.87 — a load-managed installation on the service you already have beats a new service you paid to discover you did not need. After that, the job is mostly trench, pad, gear lead time and utility sequencing.
First settle the utility: APS or SRP
APS and SRP run different portals, different standards manuals and different money rules, and the boundary between them cuts through neighborhoods and in places through individual streets. A ZIP code will not tell you which one you have. SRP lists fifteen Valley cities and towns it serves all or in part, and several of those — Phoenix, Scottsdale, Glendale, Peoria and Avondale among them — are served in part by APS as well.
APS commercial service requests run through the Construction Project Portal at build.aps.com. ESRM Section 200 lays out a 22-step sequence: APS engineers the system up to your meter panel, reviews the service entrance drawings, stakes the trench and equipment locations, inspects the trench, inspects the conduit and pads, schedules its own crews and energizes on receipt of the city or county clearance. You pull the permits, provide easements, set grade stakes, dig the trench to the APS design, and furnish the conduit and pads. SRP's Electric Service Specifications Section 1 runs a parallel sequence lettered A through V with the same basic split.
- APS requires its own inspection of the service entrance equipment on top of the AHJ inspection, and the contractor initiates it twice — once when the gear lands, again after the inspector's corrections are done. The ESRM's own warning is that late scheduling delays jobs.
- SRP wants SES shop drawings emailed to shopdraw@srpnet.com. Section 1 says panels over 225 amps that are not pre-approved; Section 9 says 400 amps or larger. The thresholds disagree, so we submit at 225 amps and confirm with SRP Distribution Design.
- SRP will not energize the load side until the AHJ has approved the installation, or a Certificate In-Lieu of Electrical Clearance is provided where no jurisdictional authority exists.
- SRP stopped permitting Customer-Owned Service after 6 July 2026. Existing customer-owned conductors can be retained for maintenance and right-sizing, but that is not a path for a new charging service.
APS publishes no committed timeline for commercial new service. Its construction pages say only that timelines vary by job complexity and current turnaround times, and neither the ESRM nor the tariff commits to a number of weeks. Anyone handing you a firm utility date is guessing. We schedule around the milestones we control and name the ones we do not.
Prove the load before you buy a service upgrade
The default assumption on an EV job is that the service has to grow. Often it does not, and NEC 220.87 is how you find out. It permits calculating an existing feeder or service load from actual maximum demand instead of a paper calculation, where maximum demand data is available for a one-year period. Where a year is not available, a minimum 30-day continuously recorded demand is allowed instead. The new load is added to 125 percent of that measured peak, and the total must stay inside the ampacity of the feeder and the rating of the service.
In Phoenix the 30-day route is where people get hurt. The metro sits in Climate Zone 2B with an ASHRAE cooling design dry bulb around 110°F, and a building's annual peak is a July afternoon with every rooftop unit locked on. Record thirty days in February and you will document a number that has nothing to do with what the service has to survive. We pull a full year of interval data from APS or SRP where the account history supports it, and where it does not, we say so and we record in the season that matters.
When the measured headroom is genuinely short, load management is the next lever, not new gear. NEC 625.42 lets an automatic load management system define the maximum load a feeder and service must carry, rather than the sum of the charger nameplates; Article 750 covers energy management systems generally. Eight 48-ampere Level 2 ports is 384 amperes of connected load, and 480 amperes once you apply the 125 percent continuous-load multiplier in 625.41 — under a properly configured listed management system it is a far smaller number on the feeder. A panel or service upgrade is a real answer. It is just rarely the first one.
Level 2 and DC fast are different jobs
| Level 2 | DC fast | |
|---|---|---|
| Typical supply | 208/240 V single-phase, or 208 V from a three-phase panel | 480Y/277 V three-phase, commonly through a dedicated transformer |
| Branch circuit | One individual branch circuit per charging outlet, no other loads (NEC 625.40) | Same rule; conductors and overcurrent protection at 125 percent for continuous duty (625.41) |
| APS metering | Self-contained enclosure with EUSERC test blocks up to 200 A | Above 200 A, a EUSERC-approved CT-rated enclosure (ESRM 302.9) |
| SRP metering | Sockets rated 100 A or 200 A; the 400 A Class 320 socket is residential only | CT-rated metering; safety test blocks on non-residential services 200 A and under |
| Utility approval | All commercial meter enclosures submitted to APS before manufacture | Same, plus a separate APS application if the equipment has any provision for inverters or generators |
That last row is the schedule risk, and it is the line item that quietly costs the most. ESRM 302.9 requires every commercial meter enclosure to be submitted to APS for review and approval before the equipment is manufactured, with the one-line showing the neutral-to-ground bond link, the EUSERC page references, bus bracing, the number of padlockable service disconnects and the correct street address. Both utilities also maintain pre-approved equipment lists: if an enclosure is not on the APS list, it is not approved for use in APS territory. Gear ordered ahead of that review is gear you may re-order.
One sizing ceiling worth knowing early: APS limits non-residential single-phase 120/240 V to an 800-ampere service entrance. Past that you either go three-phase or install multiple 800-ampere sections within ten feet of each other and let APS totalize the metering.
- 625.43 — above 60 amperes or 150 volts to ground, a readily accessible disconnecting means, lockable open per 110.25.
- 625.17 — overall usable cord length capped at 25 feet unless the equipment is listed with a cable management system. In a striped lot, that rule decides stall geometry.
- 625.54 — receptacles installed for EV charging rated 150 volts to ground or less and 50 amperes or less need GFCI protection.
- 625.52 — ventilation. Modern listed equipment is normally suitable for indoor use without it, but in an enclosed parking structure that gets answered on paper, not in the field.
Site layout, trenching, and the parts the desert breaks
Arizona has no statewide building or electrical code. Cities adopt by reference under A.R.S. Title 9, Chapter 7, Article 3, and a county board adopts for zoned unincorporated areas under A.R.S. section 11-861. Two sites four miles apart can sit on different NEC cycles. Phoenix has enforced the 2023 NEC since 1 August 2025 under Ordinance G-7397; unincorporated Maricopa County is still on the 2017 NEC; Scottsdale is on the 2020 NEC; Mesa and Glendale moved to the 2023 NEC in January 2026, and Chandler adopted it for plans submitted on or after 1 July 2025. Gilbert, Peoria and Tempe should be confirmed with each city's building department before design — we do not publish an edition for those three that we have not verified ourselves.
The amendment that catches out-of-state EV crews: Phoenix, unincorporated Maricopa County and Glendale all amend NEC 250.118 item (4) to read "electrical metallic tubing with an additional equipment grounding conductor." EMT alone is not an acceptable equipment grounding conductor here. A parking-garage EV feeder pulled in EMT without a wire-type EGC is a correction notice, and it is one of the most common ways a national installer fails its first Valley inspection.
Pad and trench
At SRP the customer provides and installs the transformer pad, and ESS Section 7 is specific: pre-cast for three-phase, sized per the SRP design, a 5/8 inch by 8 foot copper-clad ground rod in the high-voltage opening with the top 2 inches proud of the pad, conduits stubbed 2 inches above the finished pad with temporary plugs (not duct tape), CLSM backfill per MAG Section 728 with the SRP inspector approving subgrade before the pad is placed, and the top of pad at least 4 inches above surrounding grade. Then the clearances: 12 feet of clear working space at the front of the unit, 3 feet at the sides, 18 inches at the back. That 12 feet comes out of the site plan and the parking count at design, not out of an argument in the field.
Trenching is customer scope on both systems. SRP's Rules put all trenching, backfill, boring and conduit for underground service laterals on the customer or developer, or SRP does the work and charges a contribution in aid of construction. APS ESRM Section 500 requires the customer to install conduit from the service entrance equipment to the transformer pad or junction box and to contact APS before trenching to establish the trench requirements. Arizona 811 gets called at least three days before excavation. If the lot is also getting parking lot lighting or a canopy, those should be one trench and one mobilization — see underground and site work for how we sequence it.
Details the desert breaks
- Enclosure type. NEMA 3R is rainproof and carries no windblown-dust requirement. Type 4 and 4X do. For a haboob-exposed pedestal or an open-lot disconnect, 3R is usually the wrong default. NEC 110.28 and Table 110.28 govern the selection, and the NEC is explicit that an IP rating is not a substitute for an enclosure type rating.
- PVC expansion. NEC 352.44 requires an expansion fitting where calculated movement reaches 1/4 inch in a straight run between securely mounted points, and NEMA practice adds 30°F to the high ambient for a sunlight-exposed run. Above-grade PVC risers at bollards and pedestals cross that threshold easily here.
- Sunlight. NEC 310.10(D) requires conductors exposed to direct sun to be listed or marked sunlight resistant. That is separate from, and on top of, temperature derating.
- Ambient derating. Table 310.16 ampacities assume 30°C. Table 310.15(B)(1) corrects them: at 41-45°C a 90°C conductor keeps 87 percent, at 46-50°C it keeps 82 percent. Where a raceway in direct sun sits less than 7/8 inch off a roof, 310.15(B)(2) adds 33°C before the correction is applied — and XHHW-2 is exempt from that adder, which on a canopy or rooftop feeder can avoid an upsize THHN would force.
Fleet depots and multifamily common areas
Fleet depots
A depot is a load-shape problem more than a charger problem. Every vehicle plugs in inside the same two-hour window when the last route lands, so connected load and coincident load are the same number unless something is managing it. Dwell time is the asset: a van parked for nine hours does not need 80 amperes for nine hours. Getting that right usually decides whether the site needs one transformer or two.
The second fleet decision is buildout. Trench and pad are the expensive, disruptive parts; spare conduit is cheap. Stub for phase two and three and size the pad and secondary accordingly at the first mobilization. On service ceilings, SRP's limits give 277/480 V three-phase four-wire a minimum of 100 amperes and a maximum of 600 amperes overhead or 3,000 amperes underground, with 120/208 V capped at 1,600 overhead and 3,000 underground. Campus sites chasing a single bill run into SRP totalized metering, which requires all accounts on the same E-60 series price plan, services on the same or immediately adjacent property, a written request, full payment of the dedicated Facilities Charge — and SRP's sole discretion.
Multifamily and common-area parking
Phoenix's new EV requirement is residential-scoped, and it is worth stating precisely because it gets misquoted constantly. The 2024 Phoenix Building Construction Code requires new one- and two-family dwellings and townhouses with a designated garage or adjacent on-site private parking to provide one EV capable, EV ready or EVSE space per dwelling unit, and it defines all three: capable means raceway, capacity and panelboard space; ready adds the branch circuit and an outlet, junction box or receptacle; EVSE means the charger connection itself. Phoenix's adopted IRC appendix list includes Appendix NE. IECC Appendix CG, the commercial EV appendix, exists in the ICC printing as amended by the City of Phoenix but does not appear on the adopted-appendix list. Confirm its status with Phoenix Planning and Development before you design a podium or garden-style project around either answer.
One Phoenix amendment kills a common retrofit approach outright. Phoenix added NEC 215.25: feeder circuits in each dwelling unit of attached one-family dwellings supply only loads within or associated with that unit, and feeders serving adjoining townhouse units shall not pass through, above, below, or be attached to other units, regardless of ownership. A house panel feeding chargers down a townhouse row does not work here. Unit-metered chargers, or a separately metered common-area service, are the routes that do.
Rebates, stated honestly
SRP runs a Business EV Charger rebate on a May 1 to April 30 program year. Under the FY26 manual: one to four stations as a single project capped at $20,000 per site per program year, five or more capped at $40,000, no more than 75 percent of project cost for general businesses and up to 100 percent for government, non-profits, schools and multifamily, Level 2 listed at $2,500 per port, preapproval required above $15,000, and chargers required to supply at least 20 amperes per port. Those figures reset every May 1, so verify them against the current Customer Program Manual before they go into a budget. On the APS side, the Take Charge AZ pilot has had APS install and maintain Level 2 chargers with the commercial customer matching 50 percent of construction and installation cost and paying separately for the energy. Pilots open and close — confirm enrollment status with APS before you count on it.
Maintenance, and where we are not the right contractor
A charger is outdoor electrical equipment in a dusty parking lot at 110°F with a cord a stranger pulls on several times a day. It is the most abused thing on the site. The maintenance that earns its cost: connector, cable and strain-relief inspection; enclosure gasket and filter checks after monsoon season; torque verification at terminations; ground-fault and charging-circuit interrupting device function tests; a thermal scan of the feeder terminations and the upstream panel; bollard and pedestal condition; and confirmation that the site is still reporting to whatever network the owner bills through. We fold EV equipment into a site's electrical maintenance program rather than selling it as a separate visit. Where a DC fast site changes the available fault current, that is a power study question, not a guess.
Inspection economics are worth knowing before you schedule. In Phoenix the initial inspection and the first correction re-inspection are covered by the permit fee. After that it is $195 each, including an inspection called before the work was ready and a no-access call. Inspections within two hours either side of PDD inspection hours run $195 per hour with a $390 minimum; further outside, or any time Saturday, Sunday or a holiday, $195 per hour with a $585 minimum. On an occupied retail or fleet site that has to work nights, that is a real line.
- A single Level 2 port. That is a one-circuit job, and a local service electrician does it faster and cheaper.
- We do not sell, resell or take margin on charging hardware or network subscriptions. We install what you specify, and we tell you what the specified gear does to your service.
- We do not advise on tax credits. Federal incentive status has moved repeatedly — ask your CPA against current IRS guidance, not a contractor's website.
- We do not run unscheduled emergency response. This is scheduled, permitted construction, Monday to Thursday 6:00 AM to 3:00 PM and Friday 6:00 AM to 2:00 PM.
- If a charger vendor's design assumes service capacity we cannot prove out under 220.87, we will say so before the order goes in, not after the gear lands.
Send the site plan, the one-line, the serving utility and the charger cut sheets, and we will come back with the load calculation, the trench and pad scope, and the utility path. Get in touch.
Frequently asked questions
Do I need a service upgrade to add EV charging?
Often not, and NEC 220.87 is how you prove it either way. That section lets you calculate an existing feeder or service load from actual maximum demand rather than a paper calculation, provided you have maximum demand data for a one-year period, or a minimum 30-day continuously recorded demand where a year is not available. Your new charging load gets added to 125 percent of that measured peak, and the total has to stay inside the ampacity of the feeder and the rating of the service. The Phoenix trap is the 30-day option: the annual peak here is a July afternoon with every rooftop unit running, so a demand recording taken in February will badly understate what the service must survive. Where the headroom really is short, an automatic load management system under NEC 625.42 is usually the next lever before new gear, because it defines the maximum load the feeder and service must carry rather than the sum of the charger nameplates.
How long does the utility side take?
Neither utility will give you a number in writing, and we will not invent one. APS states only that project timelines vary by job complexity and current turnaround times, and neither its Electric Service Requirements Manual nor its tariff commits to a number of weeks. The two items that most often set the real date are the meter enclosure submittal and the switchgear lead time behind it, because APS requires every commercial meter enclosure to be reviewed and approved before the equipment is manufactured. The other is inspection sequencing: APS runs its own service entrance inspection in addition to the city or county inspection, and the contractor has to initiate it twice, once when the gear arrives and again after corrections. We build the schedule around the milestones we control and tell you plainly which ones we do not.
Which utility serves my site, APS or SRP?
You have to check the address, not the city and not the ZIP code. SRP lists fifteen Valley cities and towns it serves all or in part, and several of those, including Phoenix, Scottsdale, Glendale, Peoria and Avondale, are also served in part by APS. The boundary cuts through neighborhoods and in places through individual streets. It matters because the two run different portals, different standards manuals and different cost rules: APS operates under an Arizona Corporation Commission tariff with a codified feasibility test and a five-year refund window, while SRP is self-governed and its contributions in aid of construction are generally non-refundable and earn no interest. We confirm the serving utility before any design work starts.
Does Phoenix require EV-ready parking on commercial projects?
State this one carefully, because it is widely misquoted. The 2024 Phoenix Building Construction Code adds EV charging infrastructure requirements for new one- and two-family dwellings and townhouses, requiring one EV capable, EV ready or EVSE space per dwelling unit where there is a designated garage or adjacent on-site private parking. Phoenix's adopted IRC appendix list includes Appendix NE for EV charging. The commercial EV appendix, IECC Appendix CG, exists in the ICC printing as amended by the City of Phoenix but does not appear on the adopted-appendix list. That is not the same as a definitive answer, so confirm its status with Phoenix Planning and Development before you design a commercial or podium project around either conclusion. Remember also that Arizona has no statewide building code, so the answer in Phoenix tells you nothing about Scottsdale, Mesa or unincorporated Maricopa County.
Are there rebates for commercial EV charging in the Phoenix area?
SRP runs a Business EV Charger rebate on a program year that runs May 1 to April 30. Under the FY26 manual, one to four stations as a single project were capped at 20,000 dollars per site per program year, five or more stations at 40,000 dollars, with the program paying no more than 75 percent of project cost for general businesses and up to 100 percent for government, non-profits, schools and multifamily. Level 2 was listed at 2,500 dollars per port, preapproval was required above 15,000 dollars, and chargers had to supply at least 20 amperes per port. Those numbers reset every May 1, so verify them against the current Customer Program Manual before they go into a budget. On the APS side, the Take Charge AZ pilot has had APS install and maintain Level 2 chargers with the commercial customer matching 50 percent of construction and installation cost and paying separately for the energy used. Pilots open and close, so confirm enrollment status with APS. We do not advise on federal tax credits, which change and belong with your accountant.
What actually changes when the project is DC fast charging instead of Level 2?
Voltage, metering and site geometry. DC fast cabinets are normally fed at 480Y/277 V three-phase, which usually means a dedicated transformer, so you are now in a utility conversation about a pad, a lateral and possibly a line extension rather than a panel conversation. Both utilities move you to instrument-transformer metering above 200 amperes on the commercial side: APS requires EUSERC-approved CT-rated meter enclosures above 200 amperes, and SRP's only meter sockets are 100 and 200 amperes with the 400 amp Class 320 socket restricted to residential. The pad brings its own footprint rules, including 12 feet of clear working space at the front of an SRP pad-mounted unit, 3 feet at the sides and 18 inches at the back, which has to come out of the parking count at design. Available fault current changes too, which is a power study question rather than an assumption.
Can you do the trenching, or does the utility?
On both systems the trenching is the customer's scope. SRP's Rules and Regulations put all trenching, backfill, boring and conduit for underground service laterals on the customer or developer, or SRP performs the work and charges a contribution in aid of construction. APS requires the customer to install conduit from the service entrance equipment to the transformer pad or junction box, and to contact APS before trenching so the trench requirements are set by the utility rather than discovered at inspection. Arizona 811 must be contacted at least three days before excavation, and trench and conduit have to be inspected before backfill. Where a site is also getting pole lighting or a canopy, we would rather coordinate a single trench and a single mobilization at design than dig the same lot twice.
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