Protection and grounding
Panel-mounted surge protection for the whole home plus grounding correction where the existing ground is missing, undersized, or non-compliant.
Surge protection and grounding at Keil Electric covers whole-house surge protector installation at the panel, individual circuit surge protection for sensitive equipment, and ground wire installation or correction where the existing ground is missing, undersized, or non-compliant.
Same scope on either side. Pick the shop that covers your area and we will route you to the right crew.
Surge Protection and Grounding 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 and corrects grounding systems across San Diego County and the Austin metro. We add equipment grounds to circuits in older homes, install or replace ground rods at the service, correct bonding at the panel, and verify the entire grounding electrode system to NEC. Read the full ground wire installation page.
If you are planning the kind of work this covers, Keil Electric installs whole-house surge protection across San Diego County and the Austin metro. Type 1 SPDs at the service entrance for utility-side surges, Type 2 SPDs at the panel for downstream protection. Coordinated with utility rules and panel listing. Read the full surge protection installation 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.
Whole-house surge protector mounts at the main panel as a Type 2 SPD on the load side of the service disconnect. Sized by surge current rating and clamping voltage for the home's surge environment. Install runs 1 to 2 hours.
Layered surge protection combines whole-house with point-of-use SPDs at home theater, server rack, networked equipment, and other sensitive loads. Layered approach is more effective than either alone.
Ground rods 8 feet copper-clad steel, driven vertically. Single rod tested below 25 ohms ground resistance is acceptable; otherwise supplementary electrode required per NEC 250.53(A)(2). Connection uses listed clamps for direct burial. Conductor sized per NEC 250.66.
Metallic water piping bonded at the service entrance. Metallic gas piping bonded where likely to become energized. Structural metal bonded where applicable. Common failure: missing bond at the water meter on retrofit installs.
Diagnostic visits include ground impedance measurement with clamp-on ground tester or fall-of-potential testing. Readings documented in writing. Recommendations follow code thresholds (25 ohms for single rod) and best practice for the soil conditions.
Technician measures ground impedance, inspects the existing grounding electrode system, identifies bonding gaps, and assesses the home's surge protection scope.
Quote covers surge protector model and rating, ground rod work if needed, bonding corrections, and any panel work to support the install.
Whole-house SPD installs sometimes require a permit depending on AHJ. Ground rod and bonding work typically requires a permit. We pull the permit when applicable.
SPD installed at the panel, connected to the bus and ground. Ground rod driven and connected with proper conductor and clamp. Bonding corrections made at the water meter, gas line, and structural metal as required.
Post-install ground impedance measured. SPD status indicators verified. Bonding verified. Written documentation handed to the homeowner including SPD model, surge rating, and warranty.
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 surge protection and grounding systems. Parts and labor. Stays with the home and transfers to the next owner.
Surge and grounding work has clear rules. Don't install an SPD on a panel with damaged bus or known recall issues; the SPD won't reliably protect a panel that's already failing. Don't skip the supplementary ground rod when the single-rod test exceeds 25 ohms per NEC 250.53(A)(2). Don't connect ground rod conductors with non-listed clamps or aluminum hardware on copper rods (galvanic corrosion). Don't bond metallic systems through indirect paths; the bonding conductor needs to be direct and properly sized. Don't assume an SPD with no LED indicator is still functional; degraded SPDs sometimes still pass current to the panel without clamping. Surge protectors don't protect against direct lightning strikes on the structure; lightning protection systems (NFPA 780) are a separate scope. Surge protectors don't protect against sustained over-voltage (failed neutral, stuck transformer); voltage monitoring and main-disconnect controls handle that.
Real work from our San Diego and Austin shops. Same standards, same warranty, every job.
For surge protection and grounding, here's the honest comparison. We'd tell you the same thing if we weren't trying to win the job.
Surge protection and grounding work covers two related but distinct scopes. Surge protection limits how much voltage from a surge event makes it to the home’s wiring and connected equipment. Grounding establishes the path for fault current to return safely to the source, which is the foundation for every other protection in the system. Both matter. Without good grounding, surge protection has no reference. Without surge protection, grounded equipment still gets damaged when surges propagate through the wiring.
The most common scopes: whole-house surge protector installation at the panel, individual surge protection for sensitive equipment (home theater, server rack, networked equipment), ground rod installation or replacement when the existing ground is missing or undersized, supplementary ground rod installation per NEC 250.53(A)(2), bonding correction at the water pipe and other electrodes, and ground impedance testing during diagnostic visits.
NEC 250 governs the grounding system. NEC 285 governs surge protection devices. Both have specific installation rules that affect long-term performance.
A whole-house surge protector mounts at the main electrical panel and ties into the bus and ground. When a surge event occurs (lightning strike on a nearby utility line, switching surge from utility equipment, large motor turning off), the protector clamps the voltage by routing the surge to ground before it reaches downstream wiring and equipment.
Type ratings matter. Type 1 SPDs install on the line side of the service disconnect (between the meter and the main breaker). Type 2 SPDs install on the load side (in the panel after the main). Type 3 SPDs install at the point of use (point-of-use surge strips). Most residential whole-house installs are Type 2 at the main panel.
The clamping voltage and the surge current rating determine the protector’s effective performance. A 40,000-amp protector with a 600V clamp limits the surge to 600V at downstream equipment. A 100,000-amp protector with a 400V clamp does better. We pick the device based on the surge environment and the equipment being protected.
Whole-house and point-of-use protection are layered, not redundant. The whole-house unit handles large surges. The point-of-use units (good-quality surge strips, UPS units, dedicated SPDs at server racks) handle smaller surges and add a second layer of protection for sensitive electronics.
Most homes benefit from the layered approach. The whole-house unit costs less than replacing damaged equipment in a single surge event. Point-of-use protection costs little and protects against the smaller, more frequent events that whole-house alone would let through.
Common conditions that trigger grounding correction: an older home with no ground rod or a single rod where current code requires two (NEC 250.53(A)(2) requires supplementary electrode unless a single rod tests below 25 ohms ground resistance), a missing bond between the panel and the water service (NEC 250.104(A)), a damaged or corroded ground conductor at the panel, supplementary electrodes (concrete-encased electrode, supplementary rod) that haven’t been added per current code, and metallic gas piping that hasn’t been bonded per NEC 250.104(B).
The diagnostic visit measures ground impedance with a clamp-on ground tester or a fall-of-potential test. Readings above 25 ohms typically require supplementary electrodes. Readings under 25 ohms are acceptable for the existing electrode but supplementary may still be recommended.
Ground rods are typically 8-foot copper-clad steel rods driven vertically into the soil. The rod connects to the grounding electrode conductor (typically #6 or #4 copper for residential service sizes per NEC 250.66) which connects to the panel’s ground bus.
The connection at the rod uses an acorn clamp or a listed ground rod clamp rated for direct burial. The connection at the panel uses a properly torqued lug. Improper connections at either end can dramatically increase ground resistance.
Soil conditions affect rod performance. Sandy soil has higher resistance than loamy soil. Dry climates have higher resistance than wet climates. We measure after install to confirm the rod meets the code or the system needs supplementary electrodes.
Bonding ties metallic systems together so they share a common ground reference. NEC 250.104 requires bonding of metallic water piping (when used as an electrode or when over 10 feet of metal pipe is in contact with earth), metallic gas piping (when likely to become energized), and structural metal (when likely to become energized).
Common bonding failures: missing bond between the panel and the cold water pipe at the water meter, missing bond on the gas line where it enters the home, missing structural steel bond in homes with steel framing or rebar in foundation. Each one is a code requirement and a real safety improvement.
Surge protectors don’t protect against direct lightning strikes on the structure. A direct strike puts more energy into the system than any consumer-grade SPD can clamp. Lightning protection systems (NFPA 780) are a separate scope that involves air terminals, down conductors, and earthing systems.
Surge protectors don’t prevent damage from sustained over-voltage (a failed neutral or a stuck open transformer). Sustained events damage equipment over minutes to hours, not the milliseconds that SPDs are designed to handle. Voltage monitoring and main-disconnect controls handle sustained events.
Surge protectors degrade over time. Each surge event consumes some of the protector’s clamping capacity. A whole-house unit typically lasts 5 to 10 years depending on the local surge environment. Most units have an LED status indicator showing whether the protection is still active.
Every electrical system needs a path to earth. NEC 250 governs the grounding electrode system, the physical connection from the home’s electrical system to the ground itself. The grounding electrode system has several jobs:
The grounding electrode system is not the same thing as equipment grounding (the green or bare conductor inside cables). The grounding electrode system connects the home to earth; equipment grounding ties metal equipment back to the panel’s ground bus.
NEC 250.50 lists the grounding electrodes the home must use. Most homes use a combination of:
Bonding ties metal systems together so they share the same electrical potential. NEC 250.104 covers the major bonding requirements:
Bonding sizes follow NEC 250.66, sized to the service entrance conductors. The bonding conductor connects the grounding electrode system to each metal system at a single point, typically at or near the panel.
A whole-house surge protective device (SPD) installs at the panel and protects the entire home from voltage transients. NEC 230.67 (in current editions) requires SPDs on services for new construction and major service work in many jurisdictions.
SPD types:
Type 2 SPDs at the panel are the most common residential install. They install in a breaker space and connect to the panel’s neutral and ground bus. The protection is shared across every circuit in the home.
Single-point surge protection at the panel is not enough for sensitive equipment. Layered protection covers multiple stages:
Each stage absorbs a portion of a surge event. The layered approach gives sensitive electronics the best chance of surviving a major event. NFPA 780 covers lightning protection systems (air terminals, down conductors, structural earthing), a distinct scope from surge protection that some homes pursue when at high risk for lightning strikes.
If lightning has struck the home or struck nearby with visible effects on home electrical:
Insurance often covers lightning-event repairs. Document everything before any repair work, photos of damaged equipment, the appliance brands and ages, the SPD status indicator, and the timing of the event.
Every Keil Electric service entrance and panel scope includes verification of the grounding electrode system per NEC 250 and bonding per NEC 250.104. We add Type 2 SPDs at the panel as part of any major service-entrance scope and recommend layered protection for homes with sensitive equipment. The work is permitted, inspected, and backed by our written warranty.
Whole-house and point-of-use protection are layered: the panel-mounted unit handles large surges (lightning, utility events), and point-of-use strips handle smaller surges and add a second layer. Most homes benefit from both.
It mounts at the main panel and ties into the bus and ground. Installation typically takes 1-2 hours and includes verifying the panel's ground bond and the surge unit's status indicator.
Common reasons: an older home with no ground rod or a single rod where two are now required, a missing bond between the panel and the water service, or an inspection report flagging a non-compliant ground.
A typical whole-house unit lasts 5-10 years depending on the local surge environment. Most units have an LED indicator that shows whether the protection is still active.
Coverage depends on the policy and the cause of the surge. Whole-house surge protection is one of the simpler upgrades that reduces both equipment loss and the chance of needing a claim.
Pick the location closest to your property to reach the local team and request a real plan.
