Medical/dental TI: code-dense scope.
Medical and dental office TI electrical involves NEC 517 (healthcare facilities), specialized equipment circuits, imaging and sterilization equipment electrical, exam room receptacle configurations. Scope reflects both general TI and healthcare-specific requirements.
By Steven Lockhart · Reviewed by Alex Towery, C-10 #989290
Updated 2026-06-16
Medical and dental TI electrical in Marin runs $28-$48 per sq ft. Standard scope: exam room electrical per NEC 517 requirements (specific receptacle types, isolated grounds, hospital-grade in patient care areas), imaging equipment circuits (X-ray, CT, MRI requiring dedicated circuits and often dedicated transformers), sterilization equipment electrical (autoclaves, instrument sterilizers), lab equipment circuits, general medical office electrical (workstations, reception, waiting room), emergency lighting and life safety integration. NEC 517 governs healthcare facility electrical and adds requirements beyond standard commercial.
01NEC 517 essentials for medical TI.
NEC Article 517 governs healthcare facility electrical work. Applies based on facility classification: general patient care areas (Category 1), basic care areas (Category 2), and patient care vicinity (specific spaces within patient care areas). Different categories trigger different electrical requirements: receptacle types, isolated grounds, redundant power for life-safety equipment, equipment grounding standards. Most dental offices and outpatient medical offices in Marin fall in basic care areas (Category 2); imaging centers and surgery centers fall in general patient care (Category 1).
Specific 517 requirements affecting Marin medical TI: hospital-grade receptacles in patient care areas (UL listing per 517.16), redundant grounding for receptacles (equipment grounding conductor plus separate redundant ground per 517.13), specific outlet count per bed/exam table location (517.18 — at least four receptacles per general care location, with specific configurations), isolated power systems for wet locations (operating rooms, certain procedure rooms). Most medical TI work focuses on getting receptacle types and grounding right; full isolated power systems rare outside specific procedure spaces.
02Equipment-specific electrical considerations.
Imaging equipment
Dental X-ray: dedicated 20A circuit, isolated ground. Medical X-ray: dedicated 30-50A circuit depending on equipment size, sometimes 3-phase. CT scanner: dedicated 60-100A 3-phase circuit, dedicated transformer often required. MRI: complex installation with Faraday cage, specialized power conditioning, dedicated 100A+ circuit. Coordinate with equipment vendor on specifications during design.
Sterilization equipment
Autoclaves and instrument sterilizers: dedicated 20-30A circuits, often 240V. Hot water requirements for some sterilizers add electrical load. Steam generators dedicated. Coordinate with sterilization equipment supplier for specifications.
Lab and procedure equipment
Centrifuges, analyzers, microscopes, specialized lab equipment each have specific circuit requirements. Most medical TIs include 10-25 dedicated equipment circuits beyond general office electrical. Equipment list lock-in before rough-in essential for accurate circuit design.
03Coordination with healthcare-specific trades.
Medical TI involves additional specialty trades beyond standard office TI: medical equipment vendors (imaging, sterilization, lab equipment) with specific electrical specifications; medical interior designer or healthcare planner specifying exam room configurations and equipment locations; HVAC contractor with healthcare-specific requirements (negative pressure rooms, filtration for procedure spaces); plumbing with healthcare requirements (specific fixtures, vacuum systems for dental, medical gas for some practices); IT/network with HIPAA compliance considerations for patient data systems.
Our role in medical TI: electrical scope execution, NEC 517 compliance, coordination with equipment vendors on specifications, AHJ inspection coordination (sometimes more involved than standard commercial), commissioning and acceptance testing. We work with several Marin healthcare planners and have completed medical TI for general practice offices, dental practices, specialty practices (dermatology, optometry), and small surgery centers. Each has specific requirements; experienced healthcare TI contractor saves rework and inspection issues.
Common questions.
What's NEC 517 and does it apply to my office?
NEC Article 517 governs healthcare facility electrical. Applies to most outpatient medical and dental offices in basic care areas (Category 2). Specific requirements: hospital-grade receptacles in exam rooms, redundant grounding, specific outlet configurations. Doesn't apply to general office spaces, waiting rooms, or staff-only areas. We identify which areas of your facility trigger 517 requirements during design.
How much does medical TI cost?
Marin 2026: $28-$48 per sq ft for typical medical/dental TI electrical. For 3,500 sq ft typical medical office: $98,000-$168,000. Variance drivers: imaging equipment count and type, sterilization requirements, lab equipment scope, exam room count, specialty procedure areas. Dental offices often lower end of range; specialty practices (imaging, surgery) higher end.
Do you coordinate with our medical equipment vendor?
Yes — close coordination with equipment vendors is essential. Equipment cut sheets and specifications inform circuit design. Coordination meetings during pre-construction (typically 2-3 with major equipment vendors) align electrical scope with equipment requirements. Some equipment (large imaging, MRI) requires vendor-specific commissioning protocols we coordinate during commissioning phase.
What about HIPAA and patient data?
Electrical scope intersects HIPAA mostly through network infrastructure and electronic medical records systems. Dedicated circuits for IT equipment, surge protection for patient data infrastructure, UPS systems for continuity during outages all support HIPAA compliance for the medical practice. Specific HIPAA expertise comes from healthcare IT consultants; we coordinate with them on infrastructure requirements.
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.