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This project involved correcting an undersized electrical service that had been installed for two newly constructed all-electric accessory dwelling units (ADUs). After performing a detailed load calculation, it became clear that the existing electrical infrastructure could not safely support the required electrical demand.
Location
Services
Completed
The original installation consisted of a 200-amp main service panel and two 100-amp subpanels serving separate ADUs. Following a comprehensive electrical load analysis, our team determined that the system was significantly undersized for the property’s calculated electrical demand.
To resolve the issue, we redesigned the electrical distribution system and installed a new Siemens WEP4212 400-amp dual-meter service panel, providing dedicated 200-amp service and separate utility metering for each ADU.
Installed a Siemens WEP4212 400-amp service panel with separate utility metering for both ADUs.
Each dwelling unit now has its own dedicated 200-amp electrical service for reliable operation.
Installed AFCI protection on all branch circuits along with whole-panel surge protection devices.
Prepared load calculations, one-line diagrams, permit revisions, and utility coordination.
The original electrical installation did not meet the calculated load requirements for two fully electric ADUs. The existing 200-amp service and 100-amp subpanels lacked the capacity needed for safe and code-compliant operation.
The installed electrical service could not adequately support the combined demand of both dwelling units.
A detailed electrical load analysis revealed that the original design did not meet code-required capacity requirements.
The undersized system left little room for future electrical loads and increased the risk of overloading.
The existing installation required redesign and approval to meet city and utility standards.
Our team redesigned the electrical distribution system and upgraded the property to a properly sized 400-amp service. The new configuration provides separate metering and dedicated electrical service for each ADU while meeting all applicable code requirements.
Installed a Siemens WEP4212 400-amp dual-meter panel designed to provide separate utility service for each dwelling unit.
Installed new 500 MCM copper service entrance conductors for the overhead utility connection and new 3/0 copper feeder conductors to each ADU.
Installed Siemens PN-Series 200-amp subpanels in each dwelling unit to support current and future electrical loads.
Upgraded the entire grounding system to comply with California Electrical Code requirements and standards.
Our team prepared all required load calculations, one-line diagrams, panel schedules, and grounding details for permit approval through the City of Tustin. We coordinated directly with Southern California Edison to obtain approval for the new 400-amp service and managed all inspections and utility requirements through project completion.
The completed installation provides a safe, code-compliant, and future-ready electrical system capable of supporting both all-electric ADUs. With dedicated 200-amp service, separate utility metering, upgraded grounding, AFCI protection, and surge protection throughout, the property now fully meets calculated load requirements and current electrical code standards.



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Zeev DTrustindex verifies that the original source of the review is Google.
The short answer: Should you hire BeniteX? Yes. They're knowledgeable, communicative, and fairly priced, and they handle permits and utility coordination for you. I trust reviews more when they include the good and the bad, so here's both. BeniteX replaced our 100A Zinsco panel, a known fire hazard, with a new 200A Siemens panel. Roman (the owner) came out on short notice to quote the job, walked us through the process, and answered all of our questions. The final price matched the quote with no surprise charges, and the work comes with a 4-year workmanship warranty. Alex kept us updated through the permit and SCE scheduling, Roman was here for both the utility and city inspections, and everything passed the first time. While he was here, Roman also fixed two dead outlets in our kitchen for a small extra charge. Cleanup was good overall, though the paint on the inside of our electrical closet frame doesn't quite match. The one real miss was the grounding. The plan called for two grounding rods along our front walkway. Because they'd be visible, we had to get HOA approval, which delayed the project by about two months. After Benitex drilled the rods into our foundation, one of their technicians found that the house already had a Ufer (concrete-encased) ground, and that's what was used in the end. The rods were never needed, so we had them cut down and buried. Checking for an existing ground up front, or asking us for the building plans, would have avoided both the drilling and the HOA wait. They took the grounding rods off the bill, but there wasn't much acknowledgment that drilling into our foundation without checking first was a mistake.Posted on Google![]()
Erin GertsenTrustindex verifies that the original source of the review is Google.
Roman was quick and efficient! He was helpful and knowledgeable. He replaced a dimmer switch that was old and not working right with our lights. I would definitely recommend this electrician!Posted on Google![]()
Ron BurtonTrustindex verifies that the original source of the review is Google.
All phases of the project were communicated and timely. The technician doing panel upgrade worked hard, efficient and during the heat. Stucco replacement and paint was applied and was very close to matching smooth surface,Posted on Google![]()
Nick kTrustindex verifies that the original source of the review is Google.
I needed a 120-volt outlet installed as quickly as possible, and I’m glad I chose them! They were professional, honest, and friendly. The team arrived quickly, completed the installation efficiently, and didn’t add any unnecessary charges. Excellent service from start to finish. Highly recommend!Posted on Google![]()
Roxanne NguyenTrustindex verifies that the original source of the review is Google.
This is the second time I have called Benitex for a tripped-breaker and I paid $0. They are very knowledgeable and affordable. Roman was punctual, friendly and an expert in electricity ypu can trust. I highly recommend Benitex!Posted on Google![]()
AnnaTrustindex verifies that the original source of the review is Google.
Amazing service! We did the entire Medical Spa electric panel with added lines. Roman is very knowledgeable and always does what he says. Very reliable. I highly recommend!Posted on Google![]()
Jordan DiazTrustindex verifies that the original source of the review is Google.
Roman was great! Was able to install my wall charger within 24 hours of reaching out to him. He was efficient, explained everything after installation, and the 2 year warranty they offer is perfect! Would definitely recommend to anyone looking to get Tesla or EV chargers installedPosted on Google![]()
Paul S.Trustindex verifies that the original source of the review is Google.
I asked BeniteX to do a Ev charger installation and they did a great job! Great communication with Alex and transparent with pricing and the work being completed. Roman did a great job explaining electrical work and concepts that I have no knowledge about. He asked questions and confirmed all my decisions. I would recommend BeniteX to my family and friends and will definitely be reaching out to BeniteX for any electrical work I need in the future.Posted on Google![]()
Austin AlvermannTrustindex verifies that the original source of the review is Google.
They were so great! They take the time to explain exactly what they’re doing, were flexible with my calendar, and handled all the permitting stuff, which would’ve been quite difficult for me to do on my ownPosted on Google![]()
Kevin MTrustindex verifies that the original source of the review is Google.
Roman helped me troubleshoot a wiring issue that occurred during a power surge. He traced down the wire and found exactly what the problem was. He is diligent and professional at his trade; one of the very best. I am grateful to have encountered him and will refer him to anyone with electrical needs. Thank you, Roman!Verified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more
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