Panel and breaker work
Panel repair, replacement, and upgrades from 100A to 200A. Individual breaker repair and replacement. AFCI breaker installs.
Panel and breaker work at Keil Electric covers panel repair, Panel Upgrade and upgrades (100A or 200A service), individual breaker repair and replacement, and AFCI breaker installation. Every panel job starts with reviewing the existing panel, available capacity, and the property's load needs before we write a fixed-price quote. A licensed electrician is on the install when work starts, and the install is backed by our written warranty.
Same scope on either side. Pick the shop that covers your area and we will route you to the right crew.
Electrical Panels and Circuit Breakers covers a few different jobs that look similar from the outside but are quite different in scope, cost, and timeline. Here is the version that helps you walk into the call already pointed at the right one. We will confirm or correct on the phone.
If you are planning the kind of work this covers, Keil Electric installs AFCI breakers across San Diego County and the Austin metro to bring older homes up to current NEC requirements. AFCI protection is required by code in bedrooms, living areas, dining rooms, hallways, and most of the rest of a dwelling unit. We swap standard breakers for AFCI on the affected circuits. Read the full AFCI breaker installation page.
If you are seeing or dealing with the kind of work this covers, Keil Electric diagnoses and repairs failed circuit breakers across San Diego County and the Austin metro. We test the breaker under load, distinguish a bad breaker from an overloaded circuit or a downstream fault, and replace the breaker with a manufacturer-spec part. Licensed work, written warranty. Read the full circuit breaker repair page.
If you are seeing or dealing with the kind of work this covers, Keil Electric replaces failed circuit breakers across San Diego County and the Austin metro. We use manufacturer-spec breakers (Square D QO, Eaton CH, GE THQ, Siemens QP) matched to the panel listing, swap on a single visit when the breaker is the verified failure, and document the replacement. Read the full circuit breaker replacement page.
If you are seeing or dealing with the kind of work this covers, Keil Electric repairs residential and commercial electrical panels in San Diego County and the Austin metro. We diagnose buzzing, heat, repeated tripping, scorched bus bars, and loose lugs. A licensed electrician opens the panel, runs the diagnostic, and writes a fixed-price quote before any work begins. Read the full electrical panel repair page.
If you are planning the kind of work this covers, Keil Electric upgrades and replaces residential and commercial electrical panels across San Diego County and the Austin metro. We size the new service to actual load (typical upgrades are 100A to 200A), pull the permit, coordinate with the utility, and back the install with our tiered written warranty. Read the full electrical panel upgrade page.
It is common to need more than one of these at once, especially on older homes or commercial buildings where one underlying issue surfaces in several places. We bundle the work under a single scope and a single permit when the project lines up that way, which usually saves time and money versus running each as a separate visit. If you are not sure which page fits, pick the closest one or call. We will sort it out.
Pick the job that matches what you need. Each one is a licensed install with the same written warranty as the rest of our work.
Every panel project starts with a diagnostic visit. We open the panel (cover off, hands clear of the bus), assess condition, photograph everything, and write scope based on observed conditions. No replacement quotes from a phone call.
Service rating recommendations come from real load calcs, not rules of thumb. 100A is rarely sufficient for modern homes. 200A is the standard. We document the calc and explain the recommendation.
Federal Pacific Stab-Lok, Zinsco, and certain Challenger panels are replacement candidates, not repair candidates. The failure modes are documented and the risk is established. We identify these panels at the diagnostic visit and scope replacement directly.
Panel upgrades trigger AFCI per NEC 210.12 and GFCI per NEC 210.8 on circuits that need them. We confirm AHJ-adopted NEC edition, document which circuits require protection, and install accordingly. Pre-existing arcing conditions get fixed before AFCI installation, otherwise the breaker trips immediately.
Service upgrades require utility coordination for meter pull and reset. We pull permits, schedule with the utility, sequence the work to minimize downtime, and meet any inspector for sign-off. The homeowner is without power for several hours but the day is planned around critical loads.
We open the panel safely, assess bus and breaker condition, identify any recall designations, document with photos, and write scope based on what we observe.
Real load calc with continuous loads, motor loads, and any planned additions. Result drives service size recommendation. Documented in writing.
Written quote separates panel, breakers, service entrance work, permit, utility coordination, and inspection. Repair vs replacement vs upgrade is clearly delineated.
When the local AHJ requires a permit, we pull the electrical permit, coordinate with the utility for meter pull (service upgrades), and pre-schedule any inspections. Permit requirements vary by district.
New panel installed, branch circuits transferred one at a time, breakers sized to the actual loads, grounding electrode system brought to current code. Panel is fully labeled.
Inspector verifies the install. After sign-off, utility re-energizes (for service upgrades). We test every circuit, confirm GFCI/AFCI function, and walk the homeowner through the labeled panel.
Not every job requires a permit. When the local AHJ requires one, we pull it, schedule the inspection, and stay with the job until it passes. No paperwork on you.
Lifetime warranty on the panel itself; 10-year on breakers. Parts and labor. Stays with the home and transfers to the next owner.
Panel work is the most consequential electrical work in a home, and the safety rules are non-negotiable. Don't open a panel cover with the main breaker on if you're not licensed to work inside it. the bus is energized and arc-flash injuries from residential panels are well-documented. Don't back-stab connections on aluminum bus or aluminum branch wiring. Don't double-tap breakers (two conductors under one terminal screw) unless the breaker is specifically rated for it. Don't replace a Federal Pacific Stab-Lok, Zinsco, or scorched-bus panel with a like-for-like instead of upgrading. the failure mode follows. Don't skip the grounding electrode upgrade during a service replacement. older homes often have a single ground rod where current code requires two per NEC 250.53. Don't add AFCI breakers to circuits with known existing arcing conditions; the breaker will trip immediately and the homeowner will think the breaker is bad. The actual fix is the underlying condition. Always confirm that the circuits coming out of the panel are properly de-energized before working in the panel, even if the main is off. back-feeds from generators, solar PV with battery backup, or shared neutrals are real and they kill electricians who assume.
Real work from our San Diego and Austin shops. Same standards, same warranty, every job.
For electrical panels and circuit breakers, here's the honest comparison. We'd tell you the same thing if we weren't trying to win the job.
The electrical panel is the most important piece of equipment in the home. Every circuit, every load, every outlet runs through it. A panel that’s correctly sized, properly installed, and in good condition makes every other electrical decision easier. A panel that’s undersized, damaged, or part of a known recall is the constraint that drives most major electrical work.
Three questions matter when scoping panel work. Does the existing panel have known safety issues? Is the service rating sufficient for the home’s current and planned loads? Are the breakers themselves working correctly? The answers determine whether the project is repair, replacement, full upgrade, or a combination.
The most common panel work falls into a few buckets: 100A to 200A service upgrades on older homes, replacement of recall panels (Federal Pacific, Zinsco, Challenger), individual breaker replacement after a fault, AFCI breaker installation per NEC 210.12 in renovations, and panel work tied to a major load addition (EV charger, hot tub, addition).
Upgrade is typical when the panel is at or near capacity, has a known recall designation, shows heat or rust damage, or cannot accept the breakers a planned project needs. Specifically: a 100A service that won’t pass a load calculation for the home’s current loads, a Federal Pacific Stab-Lok panel (well-documented breaker failure rate), a Zinsco panel (internal arcing issues), a Challenger panel (similar failure modes), any panel with visible heat damage on the bus or in the cabinet, or any panel where the breakers won’t seat correctly because the bus is corroded.
Repair handles smaller issues: a single damaged breaker slot, a single failing breaker, a torque issue at the lugs, or replacement of breakers that have tripped and won’t reset. The breakers themselves are commodity items in most cases. The bus, the cabinet, and the wiring at the lugs determine whether repair or replacement is the right scope.
The diagnostic visit looks at the panel cover off (with the main breaker on, never with hands inside), assesses bus condition, breaker condition, lug torque, grounding electrode bonding, and labeling. We document everything we find, photograph the panel, and write the scope based on observed conditions, not assumptions.
Service sizing comes from NEC 220 load calculations, not from “what my neighbor has.” That said, modern homes have been trending toward higher service ratings for a real reason: more electrified loads. Heat pumps, induction ranges, electric dryers, electric water heaters, EV chargers, and battery storage all draw more than the gas equivalents.
100A service was standard from roughly the 1960s through the 1980s. It’s enough for a small-to-medium home with mostly gas appliances. Adding modern electric loads usually pushes a 100A panel past spec.
200A service has been the residential standard since roughly 1990. It handles most single-family homes including HVAC, electric range, electric dryer, and one EV charger comfortably. It’s the default for new builds and most upgrades.
The service upgrade is the most expensive panel work. It involves the utility (meter pull and reset), a new service entrance conductor (typically), and the new panel itself. We coordinate with the utility, schedule the meter pull, and minimize the homeowner’s time without power.
Three brands of residential panels have well-documented failure modes that change the risk calculus for any home that has them.
Federal Pacific Stab-Lok panels were installed in millions of homes from the 1950s through the 1980s. Independent testing has shown the breakers fail to trip under fault conditions at significantly higher rates than other brands, which means the breakers don’t reliably interrupt overcurrent. This is the failure mode that protects against fire. The CPSC has a long history with FPE panels. We treat them as replacement candidates, not repair candidates.
Zinsco panels (also sold under brand names like Sylvania-Zinsco) have similar issues plus an additional failure mode involving aluminum bus that can corrode and cause internal arcing. Visible signs include scorched bus, melted breaker bases, and breakers that get hot under load. We replace these.
Challenger panels (later sold by Eaton/Cutler-Hammer) have specific breaker failure modes documented by Federal Pacific-style testing. Some Challenger panels are fine, some are problem panels. The diagnostic looks at specific breaker series and panel age.
For all three, the right answer is replacement. We replace the panel, transfer the existing branch circuits, and bring the grounding electrode system up to current code in the process.
A breaker that won’t reset usually has one of three causes: an active fault on the circuit, a damaged breaker, or a damaged bus connection in the panel. We test the circuit before assuming the breaker is bad.
A breaker that gets warm under normal load is suspicious. Warm breakers usually indicate either an undersized breaker for the actual load, a loose connection at the breaker terminal, or internal damage to the breaker. We measure the load and the temperature before recommending replacement.
A breaker that nuisance-trips (trips at low load with no apparent fault) is often an AFCI dealing with a non-fault condition that triggers its arc-detection logic. AFCI breakers from the 2000s era had higher nuisance-trip rates than current designs. We can sometimes resolve nuisance trips with a current-generation AFCI replacement. Sometimes the actual fix is on the circuit (a non-arcing condition that the breaker sees as arcing).
NEC 210.12 requires AFCI protection on most living-area circuits in newly built or significantly renovated homes. NEC 210.8 requires GFCI protection in kitchens, bathrooms, garages, outdoor receptacles, unfinished basements, and within 6 feet of sinks. Local AHJ adoption varies, and some jurisdictions amend the requirements.
Adding AFCI to existing circuits during a panel upgrade or major renovation is the right move when the AHJ requires it. Adding AFCI to circuits that have known existing arcing conditions (loose terminations, scorched outlets) requires fixing the underlying issue first, otherwise the AFCI will trip immediately.
Panel work almost always requires a permit. Service upgrades require coordination with the utility for the meter pull and reset, which adds a scheduling layer beyond just the city inspector.
The sequence for a service upgrade typically runs: pull permit, schedule utility meter pull, install new panel and service entrance, schedule rough or first inspection (varies by jurisdiction), utility re-energizes, final inspection, sign-off. We pull the permit, coordinate with the utility, meet any inspectors, and deliver a labeled panel at the end.
A breaker replacement is 30 minutes once the diagnosis is complete. A Panel Upgrade (same service rating, same location, no service upgrade) is one full day on site. A 100A to 200A service upgrade is one full day on site plus utility coordination, which can add days to weeks depending on the utility’s schedule.
The homeowner is without utility power for several hours during a service upgrade. We plan around refrigerator and freezer needs, medical equipment, and any work-from-home critical equipment.
Modern residential and light commercial panels come from a handful of major manufacturers. Brand matters for service work because each panel format has its own breaker compatibility and parts availability.
The service entrance is everything between the utility line and the panel. Panel work often involves service-entrance work, particularly during upgrades:
The utility line connects to a weatherhead at the top of a service mast (a metal pipe extending above the roofline), runs down the mast through service-entrance conductors to the meter base, and then to the panel. Common service-entrance issues we find:
Service mast replacement and meter base replacement are both common scopes during panel upgrades. Both require utility coordination, the meter has to be pulled to disconnect the home from the grid during the work.
The utility line runs underground from a transformer (often a pad-mount transformer at street level) to a meter base on the home. The service-lateral conductors are utility-owned in some jurisdictions and homeowner-owned in others. The meter base side is always homeowner.
Issues with underground service tend to be at the meter base or at the transition where the conductors enter the home, uncommon but possible. Damage to the buried lateral itself usually requires utility involvement.
A subpanel is a downstream panel fed from the main panel through a feeder. Common scenarios for adding a subpanel:
Subpanels require their own grounding and bonding per NEC 250. The neutral and ground are bonded only at the main panel, not at the subpanel, a common installer error. Feeder sizing follows NEC 215 with the demand factors that apply to the loads served.
The bus bar is the metal strip inside the panel that distributes power to the breakers. Bus bar issues are serious because they affect every circuit in the panel:
Bus bar damage usually warrants Panel Upgrade. Repair is sometimes possible by replacing the affected breaker and verifying the bus contact, but if the bus shows heat damage the safer path is replacement of the panel.
Several breaker types cover modern residential and light commercial protection:
Compatibility matters: AFCI and GFCI breakers must match the panel’s breaker format. Some older panels do not have AFCI breakers manufactured for the panel’s format, which constrains AFCI installation paths during remodels.
Upgrade is typical when the panel is at or near capacity, has known recall issues (Federal Pacific, Zinsco, Challenger), shows heat or rust damage, or cannot accept the breakers a planned project needs. Repair handles smaller faults: a damaged breaker slot, a single failing breaker, or a torque/termination issue.
Common signs are breakers tripping under normal load, the panel feeling warm to the touch, lights dimming when major appliances start, or no available slots for a planned addition. We confirm with a load calculation, not a guess.
Many older homes are still on 100A service, which is often undersized for modern loads (EV chargers, AC, electric appliances, hot tubs). 200A is the common upgrade target.
Local code adoption varies, but AFCI breakers are required in most living-area circuits in newly built or significantly renovated homes. We confirm what your specific city requires before quoting an AFCI install.
A typical residential Panel Upgrade runs one full day on site, plus utility coordination for the meter pull and re-energize. Permit and inspection timing can add days depending on the city.
Pick the location closest to your property to reach the local team and request a real plan.
