Delivering the next generation of service today.

Testing Services

H A R T- Field Services

In addition to regularly scheduled maintenance testing, H A R T provides third party acceptance testing on electrical apparatus regardless of manufacturer. While some testing organizations work directly for switchgear manufacturers, we remain independent. We will provide impartial reports on equipment status and actions required...

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Maintenance Services

H A R T- Engineering Services

We perform electrical testing, maintenance and repairs on all electrical apparatus. We provide cost-effective preventative maintenance with minimal down-time of your electrical system. We identify equipment at risk of failure and recommend corrective actions. A plan is then implemented to prevent future failures...

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Repair Services

H A R T- Engineering Services

When electrical equipment fails, call H A R T High-voltage Apparatus Repair & Testing. Contact us 24 hours a day for immediate on-site damage assessment, to schedule a planned outage or utilize our shop services. We have more than 20 years of experience with repairs, rebuilds and retrofits of electrical switchgear:...

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Transformer Services

H A R T- Engineering Coordination Studies

We are proud to be one of the few companies in California and Nevada that has a High-Vacuum Mobile Purification Unit that we can bring to your site. H A R T High-voltage has the equipment, expertise and experience to handle your insulating fluid servicing needs. Whether you need to vacuum fill a new transformer...

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Safety Standards with HART


H A R T is committed to ensuring a safe environment for all its employees. We use the following standards and training: National Electrical Code - NEC ®, NFPA 70E electrical safety, OSHA electrical safety-related work, Arc-flash hazard analysis training, Safe work practices and energized maintenance procedures. We are also members of PICS & ISNetworld.

24-Hour Emergency Service –
CA: (530) 755.3126, NV: (775) 358.0773


Our services are available 24/7 to our clients on both a planned and emergency basis 365 days a year. We respond the emergencies at a moment’s notice, ready to troubleshoot any issue that threatens the integrity of your power system.

Your High Voltage Specialists


H A R T High-voltage is not just another testing company. We have been servicing electric utilities, power plants and large scale power users for over 20 years. The majority of our work is on medium and high-voltage switchgear and apparatus. Our capabilities go beyond the industry standards. These services include disaster assessment, switchgear repair, transformer oil processing, equipment retrofits, and other custom services.

Contact us today


We are prepared to service your testing and electrical maintenance needs, call us today to start planning your next project.
Phone: CA (530) 755.3126, NV (775) 358.0773
Fax: (530) 755-3445