EV Charging Infrastructure: The Drawing Reviews Most Teams Are Doing Wrong
EV-ready and EV-capable code requirements look simple on paper. The coordination work behind them is what determines whether the building can actually serve the chargers when an owner wants to install them.
EV-Ready vs EV-Capable vs Installed Chargers
Most jurisdictions now require some level of EV infrastructure in new commercial and multifamily construction. The terminology matters because the drawings differ. EV-installed means a working charger at handover. EV-ready means a 208/240V circuit terminating at the parking space, ready for charger installation. EV-capable means a panel and conduit pathway are in place but no circuit is run yet. CALGreen, the IECC, and many city ordinances require a mix.
The mistake we see most often is drawings that count the parking space toward EV requirements but don't reserve the panel capacity, conduit pathway, or transformer headroom to actually energize those circuits later. The building gets its certificate of occupancy. Two years later the owner tries to install chargers and discovers the service can't handle them.
Service and Distribution Sizing
Charger load is non-trivial. A Level 2 charger at 40A continuous draws around 7.7 kW. A bank of 20 spaces at full load is 154 kW — enough to require a dedicated transformer on most multifamily projects. NEC Article 625 allows for energy management systems (EMS) that reduce the calculated load, but the drawings have to show the EMS strategy, the transformer capacity, and the panel allocation that supports it.
Common drawing-review failure: the electrical one-line shows enough capacity for the chargers shown today, but no capacity for future chargers required by the EV-ready or EV-capable counts. When the building is at 60% charger occupancy and the operator wants to add more, the service has to be upgraded — utility coordination, transformer pad, sometimes a new vault. That cost is six figures and avoidable.
The right review approach: confirm that the panel and service have headroom for the full EV-ready and EV-capable count, not just the installed chargers. Verify the EMS strategy is documented. See our broader coverage in electrical coordination.
Conduit Routing and Civil Coordination
On surface lots, the conduit run from the panel to the parking space crosses paving, landscape, and sometimes drainage. The civil drawings often show none of this — EV conduit is treated as an electrical-only item even though it lives in the civil scope. The result is conduit stubbed up in the wrong location, conflicts with paving cross-slopes, or conduits crushed by landscape trenching that wasn't coordinated.
In parking garages, the conduit path interacts with sprinkler piping, fire alarm conduits, and any post-tensioned slab. PT slabs need pre-poured embedded conduits or core-drilled paths after the fact, and core drilling a PT slab without the structural engineer's sign-off is a known route to a six-figure repair. The drawings should show the embedded path before the slab is poured.
Charger-Specific Items Drawing Reviewers Miss
Bollard and impact protection. Codes increasingly require physical protection for chargers. The bollard placement has to clear the parking-space envelope and not block the cord-management arm.
ADA-compliant accessible chargers. Federal and California guidance has clarified that accessible EV chargers need maneuvering space, a pathway free of trip hazards, and a charger model with reach and operability features. Most generic site plans show one accessible space without confirming the charger meets accessibility requirements.
Networking and cellular service. Networked chargers need a cellular signal or hardwired data path. In a parking garage, cellular is unreliable. The drawings should show the data infrastructure if the charger relies on it for billing or fleet management.
Fire department access. Some jurisdictions require shutoff switches at the entry to the parking facility so first responders can de-energize all chargers at once. The drawings should show the shutoff location and the labeling.
DC fast charging. If any DCFC is planned or required, the service requirements change dramatically. A single 150 kW DCFC is more load than a typical 50-unit multifamily building. The drawings should explicitly call out the DCFC service path and the utility coordination required.
Drawing Review Checklist for EV Infrastructure
- Service and panel headroom matches the full EV-ready/EV-capable count, not just installed chargers
- Transformer capacity sized for ultimate buildout
- EMS or load management strategy documented
- Civil drawings show conduit pathways with paving/landscape coordination
- Garage drawings reconcile conduit with PT slab, sprinklers, and fire alarm
- Accessible space placement and charger model meet accessibility requirements
- Code-required signage, bollards, and shutoffs are shown
Why It's Worth Catching Early
EV charging infrastructure is one of the few building systems where the cost of failure compounds. A mistake at the drawing stage forces a service upgrade later. The service upgrade requires utility coordination, which requires owner capital and downtime. By the time the upgrade is approved and built, the building has lost two leasing seasons and the operator has been deflecting tenant requests for chargers the whole time.
The drawing-review cost to do this right is an hour or two from the electrical engineer and the civil engineer. The cost of getting it wrong is ten times that. There's no other coordination problem with that ratio.
Verify EV Infrastructure Across Drawings
Helonic checks EV-ready, EV-capable, and installed counts against panel capacity, transformer sizing, and conduit pathways. Catch the gap between code-required infrastructure and what the drawings can actually deliver.
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