We work across 91761, 91762, and 91764, replacing Federal Pacific and Zinsco panels, upgrading to 200 amp service, and installing AFCI and GFCI breakers that meet current California Electrical Code. Same-day estimates, code-correct work, and a panel label you can actually read.
Upland, California
Serving Ontario and nearby
An Electrical Panel Upgrade in Ontario is the electrical service that replaces an outdated or overloaded panel with a modern, code-compliant one sized for today's electrical load.
Ontario's housing stock splits cleanly in two: mid-century homes near Downtown Ontario and Euclid Avenue Area still running 60-amp or 100-amp fuse boxes, and newer construction in Ontario Ranch built with 200-amp service that still needs subpanels for EV chargers and solar. We've pulled permits in San Bernardino County for both.
Our electricians carry the tools that make the difference on older panels: a clamp meter to measure actual load, a circuit breaker finder to map unlabeled circuits, and a torque screwdriver to spec every breaker terminal per the manufacturer's listing.
Whether you need affordable breaker panel replacement in Ontario or a full 200 to 400 amp service upgrade, we scope the job, pull the city electrical permit, and finish with a panel schedule that matches what's actually in the box.
Ontario has one of the widest mixes of electrical demand in the Inland Empire. The city runs from historic residential blocks near Downtown Ontario to the industrial corridor around Ontario International Airport, and each property type hits different panel limits. Older homes on 100-amp service trip breakers when a dryer, AC, and microwave run at once.
Warehouses and small commercial buildings near Ontario Mills need three-phase or heavy 400-amp service. We serve Ontario because the work here is varied and the code requirements are real, not decorative. California Electrical Code and NEC 2020/2023 compliance matter on every permit, and we build that into the estimate instead of discovering it at inspection.
Good to know in Ontario
Many Ontario homes built before 1970 have masts that no longer meet the required height above the roof line. That can fail inspection even if the panel itself is fine.
Ontario permits are inspected against the current California Electrical Code, which adopts NEC 2020/2023.
Downtown Ontario has some of the oldest housing stock in the city, and many homes still run 60-amp or 100-amp service with original fuse boxes. Federal Pacific and Zinsco panels show up here regularly.
Ontario's panel upgrade demand runs in two lanes: older homes that need a fuse box to breaker panel conversion, and newer properties adding capacity for EV charging and solar.
Most Ontario homes built before 1980 sit on 100-amp service that can't carry a modern load.
Larger Ontario homes and small commercial properties near Ontario Mills often need 400-amp service to run multiple AC units, EV chargers, and shop equipment.
A subpanel lets you add circuits without replacing the main panel.
Ontario's older neighborhoods still have fuse boxes with 60-amp or 100-amp service, and many carry Federal Pacific or Zinsco panels that fail without warning.
Federal Pacific Stab-Lok and Zinsco panels are known failure points, and Ontario has plenty of both in mid-century homes.
Current California Electrical Code requires AFCI protection on most branch circuits and GFCI protection in kitchens, baths, garages, and outdoors.
Inland Empire voltage swings and summer lightning take out electronics, HVAC boards, and garage door openers.
Service masts crack, rust, and pull loose from the roof, and meter mains fail from corrosion or heat.
Before any upgrade, we run a load calculation to NEC Article 220 to see what your service can actually carry.
Ontario Ranch and newer developments are adding EVs and rooftop solar faster than the original panels can support.
Pick a service to see how we approach it here.
Most older Ontario homes run 100-amp service that cannot carry central AC, a dryer, and an EV charger at once. We measure the actual load with a clamp meter, then size the new 200-amp panel to the calculation. The work includes a new meter main, copper service conductors, and a labeled panel schedule.
Larger Ontario homes and small commercial properties often need 400 amps for multiple AC units, EV chargers, and shop equipment. We split the circuits across subpanels so no single bus carries the whole building. The service conductors and meter main are sized to the full calculated load.
A subpanel adds circuits without replacing the main panel, which fits Ontario garages, workshops, and ADU conversions. We run copper feeders sized to the load and land them on a dedicated breaker. Every circuit gets a label so the next electrician can read the panel.
Ontario homes with fuse boxes usually have 60-amp service and no AFCI or GFCI protection. We remove the old box, install a modern breaker panel, and upgrade the grounding and bonding. The city permit is pulled before work begins, and the panel is inspected after.
Ontario homes need capacity for daily life; businesses need capacity for equipment and peak hours.
Older Ontario homes often run 60-amp or 100-amp service that trips under modern load. Newer homes in Ontario Ranch fill up fast with EV chargers and solar.
Ontario commercial properties need panels sized for equipment, HVAC, and peak business hours. We schedule work around your operating hours.
Ontario's mix of older housing and newer construction creates a specific set of panel problems. The older homes deal with age and outdated equipment. The newer homes deal with capacity, because modern life adds load faster than the original panel was sized for.
These panels were installed in many Ontario homes built between the 1950s and 1970s. The breaker mechanisms are known to fail under overload, meaning the circuit keeps drawing power and heats up instead of tripping. Age makes it worse, and the failure can be sudden.
Ontario homes built before 1980 were wired for a fraction of today's electrical demand. Add a central AC, an EV charger, a dryer, and a microwave, and a 100-amp panel is over its limit. Breakers trip, lights dim, and the panel runs warm.
Some Ontario homes from the 1960s and 1970s have aluminum branch circuits. Aluminum expands and contracts more than copper, so terminations loosen over time. A loose connection at the breaker creates resistance, which creates heat, which can start a fire.
Ontario's inland heat and dry summers take a toll on exterior electrical equipment. Service masts rust, weatherheads crack, and meter mains corrode. A damaged mast can pull the service drop loose, which cuts power and creates a shock hazard.
Watch for these signs that your Ontario panel is past its limit.
Any one of these is worth a call.
Nothing picked yet. Tap the signs you have noticed and this box will sum them up.
There is no price list here, because every job is different. These are the things that move an estimate most.
A 100-to-200 amp upgrade is the most common job in Ontario and sits at the lower end of the range.
If your mast is rusted, short, or pulling away from the roof, it has to be replaced during the panel swap. The same goes for a corroded meter main.
Ontario requires a city electrical permit for any panel replacement or service change. The fee varies by scope and is separate from labor and materials.
Ontario is a big city with distinct zones, and we use familiar landmarks to route trucks and set arrival windows. If you're near Ontario International Airport, we know the surface streets that avoid the terminal traffic.
Landmark
The airport anchors the south side of the city and gives us a clear reference point for jobs in the surrounding industrial and residential streets.
Landmark
Toyota Arena sits near the 10 freeway in downtown Ontario. We use it as a landmark for scheduling around event nights, since traffic and parking near the arena can slow a service call.
Landmark
Ontario Mills is a major retail landmark off the 15 freeway. We use it to orient jobs on the east side of the city and to plan routes that avoid the mall traffic on weekends.
Landmark
The Convention Center sits near the heart of downtown Ontario and helps us locate jobs in the surrounding commercial district.
Landmark
The Metrolink station on East Emporia Street gives us a fixed point for jobs in the older downtown blocks.
Commercial area
Euclid Avenue is one of Ontario's main commercial spines, with a mix of retail, restaurants, and service businesses running from downtown south toward the 60 freeway.
Commercial area
The area around Ontario Mills is a dense retail and hospitality district with large-footprint buildings and high electrical demand.
Transit
The station sits on East Emporia Street near downtown, with easy access from Euclid Avenue.
Not listed? Call and we will tell you whether we can get to you.
Check my areaOur Federal Pacific panel finally gave out and we needed it replaced fast. They pulled the permit, handled the utility disconnect, and had a new 200-amp panel in by the end of the day. The electrician walked me through the new panel schedule and labeled every breaker. Clean work, no surprises on the bill.
We added a second EV charger and kept tripping the main breaker. They ran a load calculation, explained why 200 amps wasn't enough, and upgraded us to 400 amps with a subpanel in the garage. Both cars charge overnight now and we haven't tripped once. They even coordinated the solar backfeed so nothing exceeded the busbar rating.
Our restaurant kept losing power during lunch rush. They worked overnight to upgrade the panel to 200 amps and added a subpanel for the kitchen equipment. We didn't miss a single service. The inspector signed off the next morning. Worth every penny.
Ontario's climate puts specific seasonal pressure on electrical panels. Summer heat drives AC load and panel temperature. Winter adds heating and holiday lighting. If you're planning a breaker panel replacement near me Ontario, here's what each season looks like.
Ontario sits in the middle of our service region, and we run trucks through the surrounding cities every week. If you're just outside Ontario, we likely cover your street too. Here's how the nearby areas connect to our Ontario-based work.
Straight answers to what people ask first.
We give you a written scope before we start, so the price doesn't move.
Yes. The city of Ontario requires an electrical permit for any panel replacement, service change, or new circuit. The work is inspected against the California Electrical Code, which adopts NEC 2020/2023. We pull the permit for you, meet the inspector on site, and provide the load calculation and panel schedule. Skipping the permit can void your insurance and complicate a home sale.
Yes. If you smell burning near the panel, see sparks, or the main breaker won't reset, call us at (909) 850-3163. Permanent replacement is scheduled for the next available slot, often the same day. Don't reset a breaker that keeps tripping on its own.
A standard 200-amp panel swap takes four to six hours of on-site work, plus the utility disconnect and reconnect. If we're replacing the service mast or meter main, plan for a full day. Most Ontario jobs are done in one visit, and we schedule the inspection for the next business day. You'll have power back the same day in most cases.
If your panel is tripping, warm to the touch, or you still have a fuse box, don't wait for it to fail. We pull the Ontario permit, run the load calculation, and install a UL-listed panel that passes inspection the first time.
Call or email with your address and what the panel is doing, and we will tell you what the job likely involves. We answer calls Monday through Friday, 8am to 6pm, and return messages from Upland, Rancho Cucamonga, and Ontario the same business day. For dead panels and burning smells, say so on the call.
