This is a tough situation, and your customers' disappointment is understandable. While a Type 1 SPD at the service entrance provides a good first line of defense, it's crucial to understand its limitations, especially against direct lightning strikes. Here's a breakdown of what might have happened and some considerations

Understanding the Limits of Surge Protection
Direct Strikes are Devastating

A direct lightning strike carries an enormous amount of energy. While a Type 1 SPD can divert a significant portion of a surge, it's

unlikely to completely eliminate the voltage spike from a direct hit. Think of it like trying to stop a tsunami with a seawall – it can help, but it won't always prevent all damage. Energy Capacity

SPDs have a limited energy absorption capacity. A direct lightning strike can exceed this capacity, even if the indicator light suggests it's still "operational." The green light usually indicates that the MOV (Metal Oxide Varistor) components haven't catastrophically failed (shorted), but it doesn't guarantee they diverted the entire surge.

Lightning Follow-Through

Sometimes, after the initial surge, lightning can cause follow-through currents, especially in gas lines or other conductive paths. These follow-throughs are not the initial lightning bolt but a result of the ionized path created by the strike.

Possible Explanations for the Damage



Grounding and Bonding Issues

Your boss is on the right track. Improper grounding and bonding is a major factor in lightning damage.

Gas Line Bonding

The gas line must be properly bonded to the grounding electrode system. If it's not, the gas line can act as a path for the lightning surge, potentially damaging anything connected to it (like the stove and furnace). It's not just the gas itself being conductive, but the metal pipes creating a conductive pathway.

Coax Bonding

The coax cable should also be properly bonded to the grounding system before it enters the house. This helps to divert surges that travel along the cable.

Ground Rod Resistance

While you installed ground rods, it's important to test the resistance to ground. High resistance makes it harder for surges to dissipate into the earth.

"Cascading" Surges

The initial surge from the lightning strike can create smaller, "secondary" surges within the home's electrical system. These smaller surges can damage sensitive electronics even if the main SPD is functioning.

Ground Loops

Improper grounding can create ground loops, which can amplify the effects of a surge and make damage more widespread.

Inductive Coupling

Lightning strikes can induce surges in nearby wiring even if there's no direct connection. This can happen in parallel runs of wire (e.g., electrical wiring running near coax cable).

SPD Failure Mode

Although the indicator light may be on, SPDs can degrade over time with repeated surges. It's possible the SPD's performance had diminished, reducing its ability to handle a large strike.

Lack of Point-of-Use Protection

While the Type 1 SPD provides whole-house protection, it's often recommended to also use point-of-use surge protectors (e.g., power strips with surge protection) for sensitive electronics like TVs and computers. This provides an extra layer of defense.

Specific to the Customers' Losses



Customer 1



Gas Furnace & Stove

Likely related to gas line grounding/bonding issues.

Security Camera (WiFi)

Surge could have entered through the power line or the data line (WiFi, even though wireless still uses electricity).

Electric Blanket

Direct surge through the electrical system.

Lightbulbs (Vanity)

A strong surge could easily burn out incandescent bulbs.

Flat Screen TV (Coax)

Surge entered through the coax line.

Customer 2



Gas Stove

Almost certainly a gas line grounding/bonding issue.

What to Do Now


Inspect Grounding and Bonding

This is the most critical step.

Gas Line Bonding

Ensure the gas line is properly bonded to the main grounding electrode system with a listed bonding clamp. Check for corrosion at the connection points.

Coax Bonding

Verify the coax is bonded to the grounding system where it enters the house.

Ground Rod Resistance

Measure the resistance to ground of your ground rod system. Ideally, it should be 25 ohms or less. If it's higher, consider adding additional ground rods or improving soil conductivity.

Bonding at the Meter Combo

Ensure that the neutral and ground are properly bonded at the service entrance.2.

Review Installation Practices

Double-check your work to ensure you followed all applicable electrical codes and manufacturer's instructions.3.

Consider Additional Protection



Point-of-Use Surge Protectors

Recommend point-of-use surge protectors for sensitive electronics.

Whole-House Coax/Data Line Surge Protectors

These protect devices connected to coax or data lines.

Lightning Rod System

For homes in areas prone to frequent lightning strikes, a lightning rod system is the best way to provide effective protection.4.

Educate Customers



Limitations of SPDs

Clearly explain that SPDs are not a guarantee against all lightning damage, especially direct strikes.

Layered Protection

Emphasize the importance of a layered approach to surge protection, including whole-house and point-of-use devices.

Regular Inspection

Advise customers to have their electrical system inspected periodically, including the grounding and bonding system.

Addressing Customer Disappointment



Empathy

Acknowledge their frustration and disappointment. Let them know you understand their situation.

Explanation

Explain the limitations of surge protection and the likely causes of the damage.

Solutions

Offer to inspect and correct any grounding and bonding issues to improve their protection.

Transparency

Be honest about what the SPD can and cannot do.

Important Notes



Consult with a Lightning Protection Specialist

For complex situations or in areas with high lightning frequency, consider consulting with a certified lightning protection specialist.

Electrical Code

Always adhere to the latest edition of the National Electrical Code (NEC) and local codes regarding grounding and bonding.*

Documentation: Keep thorough records of your grounding and bonding installations, including ground resistance measurements.By thoroughly investigating the grounding and bonding system, recommending additional protection, and clearly communicating with your customers, you can help minimize the risk of lightning damage and manage their expectations effectively. Flag for review