Dedicated circuits: each large load gets one.
Large equipment — EV chargers, electric ovens/ranges, kilns, large air compressors — needs dedicated circuits sized to manufacturer spec. Sharing or undersizing creates trips and risk.
By Steven Lockhart · Reviewed by Alex Towery, C-10 #989290
Updated 2026-06-16
Large equipment dedicated circuit scope: sized per equipment nameplate (FLA, continuous load, demand factor as applicable), dedicated breaker in panel (no other circuits sharing), proper conductor gauge per amperage and distance, appropriate receptacle or hardwire connection, GFCI protection where required. Marin install $400-$2,500 typical per circuit depending on amperage, distance from panel, and receptacle type.
01Why dedicated circuits matter for large loads.
Large equipment loads commonly exceed 20A — well beyond standard branch circuit capacity. Plugging a 30A appliance into a shared 20A circuit causes nuisance trips at best, potential fire risk at worst. NEC requires many specific large-load circuits to be dedicated: electric range (NEC 210.19(C)), electric dryer (NEC 220.54), and others. Beyond code requirements, dedicated circuits improve reliability and isolate trip events.
Specific load examples and circuit requirements: Level 2 EV charger 40-60A (10-15kW), electric range 40-50A (10-12kW), electric water heater 30A (3.8kW typical), large air compressor 30-60A depending on HP, kiln 30-60A depending on size, large window AC 20-30A, hot tub 50-60A. Each gets its own dedicated circuit with appropriate breaker, conductor, and termination.
02Common Marin large-equipment installs.
EV charger circuit
40A or 60A 240V circuit to EV charger location. Typical Marin install $800-$1,800 depending on distance from panel. See dedicated EV cluster for detail.
Electric range/oven
40A or 50A 240V circuit to kitchen. Range receptacle or direct connection. NEC 210.19(C) requires dedicated.
Hot tub
50A or 60A 240V circuit with GFCI breaker (required by NEC 680). Outdoor weatherproof disconnect within 5-10 feet of tub per code. $1,400-$3,500 install.
Workshop equipment
30A-60A circuits for table saw, planer, dust collector, air compressor in garage workshops. Often grouped install $800-$2,500 for 2-4 circuits.
03Sizing and code requirements.
NEC has specific sections for many common large equipment types: Article 422 for appliances, Article 425 for fixed resistance heating, Article 440 for HVAC, Article 625 for EV charging, Article 680 for swimming pools and spas. Each has nuanced requirements for sizing, protection, GFCI/AFCI, disconnect, and installation. We follow manufacturer specs (which usually align with NEC) and verify code compliance for each installation type.
Continuous load consideration: equipment expected to run 3+ hours continuously is 'continuous load' per NEC and conductor/breaker must be sized at 125% of nameplate amps. EV chargers are explicitly continuous (NEC 625.41); some other equipment is sized at nameplate FLA. Affects circuit sizing — 48A continuous load needs 60A breaker and conductor, not 50A.
Common questions.
How long does a single equipment circuit install take?
Typical scope: 2-4 hours install per circuit. Includes breaker install in panel, conduit run from panel to equipment location, conductor pull, receptacle or termination install, testing. Multi-circuit projects benefit from batch efficiency. Distance from panel and routing complexity (conduit through finished walls vs accessible spaces) significantly affects time.
Does this require permit and inspection?
Yes — adding circuits is permitted electrical work in Marin AHJs. Permit cost $80-$200 typical per project. Inspection focus: circuit sizing matches equipment, proper protection (GFCI/AFCI where required), receptacle compliance, panel directory updated. Inspection scheduled 1-2 weeks after install.
Can I install the receptacle myself if you run the circuit?
We typically include the receptacle in our scope because it's a small portion of total work and ensures the final connection is correct. Homeowner-installed receptacles can work but create permit complications — the permitted electrical work should end at a finished, compliant termination. Better to include receptacle in our scope; saves modest cost is rarely worth the complication.
What if my panel doesn't have a spare breaker slot?
Several options. Tandem breakers (two breakers in one slot) work for smaller circuits where panel accepts them. Panel upgrade adds slots and possibly capacity. Sub-panel adds capacity and slots. For a single new large circuit, sometimes the easiest answer is panel upgrade or sub-panel install depending on overall capacity status. We assess during quote and recommend best path.
How do you handle pricing — flat fee or hourly?
Both, depending on scope. Routine service calls and predictable scope (panel replacement, EV charger install, transfer switch install, fixture replacement) are flat-fee quoted up front. Diagnostic visits and emergency scope are hourly because we don't know what we'll find. Either way, you get a written quote before work starts on anything significant, and we don't proceed beyond the quote without your sign-off.
How quickly can you schedule?
Depends on scope and season. Emergency dispatch: same-day across Marin County (1-3 hours business hours, 1-4 hours after-hours). Same-day standard service: 3-6 hours from call when capacity allows; otherwise next business day. Scheduled service work: 1-3 weeks typical. Larger projects requiring permits and PG&E coordination: 4-12 weeks depending on scope. We're upfront about timeline at the quote stage.
What warranty do you offer on work?
Our standard residential warranty: 2 years on labor, manufacturer warranty on parts (varies by product — typically 1-10 years). Major installs (panels, generators, EV chargers) often have longer manufacturer warranties (5-10 years). If there's an issue with our work in the warranty period, we come back and fix it at no cost. We also stand behind work past warranty — repeat customers and referrals matter more than a transactional fix.
Are you licensed and insured?
Yes. California State License Board C-10 Electrical Contractor #989290, in good standing. Carry general liability insurance and workers' compensation insurance as required by California law. Bondable on projects requiring it. Happy to provide proof of insurance to clients or property managers on request. License lookup: cslb.ca.gov.
Talk to a licensed electrician in Marin.
Family-run, C-10 #989290, 20+ years in the trade. Honest scoping, fair pricing, work that lasts.