Whole-home surge protection: when to recommend it

What the code says

Section 230.67 arrived in the 2020 edition of the National Electrical Code. In plain terms it has four parts, summarized below from the published code-change analysis^[1].

Required, recommended or neither

Most US states require electricians to be licensed^[2], and with a license comes a duty to give customers accurate information. Customers should hear clearly which category their job falls into.

• Required: a new dwelling service, or replacement of the service equipment, in a jurisdiction enforcing the 2020 NEC or later without an amendment removing 230.67.
• Recommended: an existing home with no service work, where the customer has sensitive equipment, a history of surge damage, or a new HVAC system, generator, solar or EV charger.
• Optional: a home with little sensitive equipment where the customer is not interested after a fair explanation.

Why it matters to more homes than it used to

Homes now carry more electronics wired to the electrical system, not just plugged in. 88% of US households use air conditioning^[3], and two-thirds use central AC or a central heat pump as their main equipment^[4]; modern systems rely on control boards and variable-speed motors. Add smart thermostats, connected appliances, routers and chargers, and a typical house has much more to lose from a transient than it did when the old service was installed.

That is the honest case: not that a surge protector prevents fires or lightning damage, but that a device at the service entrance limits the size of surges that reach the whole house, including hard-wired equipment a power strip cannot protect.

What a service-entrance SPD does and does not do

• Does: diverts or clamps surges entering on the utility service before they reach branch circuits.
• Does: protect hard-wired loads, such as HVAC equipment, ranges, well pumps and garage door openers, that cannot use plug-in protection.
• Does not: stop a direct lightning strike to the house.
• Does not: stop surges created inside the home by motors and compressors cycling, at least not fully.
• Does not: replace point-of-use protection for computers, TVs and network gear, or proper grounding and bonding.
• Wears over time: many devices have a status light that shows when protection is spent; tell the customer what to look for.

Keep claims to what the device and its listing support. If the manufacturer offers a connected-equipment warranty, explain its real conditions instead of quoting the headline number.

Five questions that tell you whether to recommend it

A short survey keeps the recommendation tied to the house in front of you rather than a sales script. Ask these during the walk-through and note the answers on the work order.

1. Has the home had equipment fail after a storm or a utility outage, such as a furnace board, garage door opener or appliance control?
2. Is there a new or planned HVAC system, heat pump, generator, solar inverter, battery or EV charger?
3. Does anyone work from home with equipment they cannot afford to lose for a day?
4. Is the home on a long overhead rural line, or in an area where outages are frequent?
5. When was the panel last replaced, and is there any sign of poor grounding or bonding?

Two or more yes answers make a recommendation reasonable. One or none, mention it once and move on. Write down which answers drove your advice so the next technician sees the same reasoning.

Pair it with the jobs where it makes the most sense

Surge protection is easiest to explain, and cheapest to install, when you are already working at the panel. Build it into the scope templates your office uses for these job types so nobody forgets to offer it:

• Service upgrades and panel replacements, where 230.67(D) usually makes it a required line.
• Generator interlocks and transfer switches, because the panel cover is already off.
• EV charger circuits and solar or battery tie-ins, which add expensive electronics to the home.
• HVAC replacements done with a partner contractor, where both trades can explain why control boards need protection.

Train office staff and anyone answering the phone to describe it the same way technicians do: required on service replacements where the code applies, optional otherwise. Mixed messages between the call and the visit are what make customers suspect an upsell.

How to bring it up with a customer

1. 01

   On a service upgrade

   Say: the current code here requires surge protection whenever the service equipment is replaced, so it is part of this quote. It goes in at the panel and protects everything in the house that is wired to it.

2. 02

   On a new HVAC install or generator

   Say: this new system has electronic controls. A surge device at the panel helps protect it and the rest of the house. It is not required for this job, but we recommend it, and it is cheaper to add while we are here.

3. 03

   On a routine service call

   Say: your panel does not have surge protection. It is not required unless the service is replaced, so there is no pressure. Here is what it would do and what it would cost, if you want it.

4. 04

   Handle the 'is this an upsell?' question

   Say: it is optional on this job. I mention it because the equipment in homes has changed. If you would rather spend the money on point-of-use strips for the TV and computer, that is a reasonable choice too.

Example: a 200-amp service upgrade quote

Example (fictional): an electrician quotes a homeowner replacing a 100-amp panel with a 200-amp service. The quote shows the surge-protective device as a separate line marked as required by the locally adopted code, with the model and its Type rating. A second optional line offers whole-home point-of-use strips for the office and living room. The homeowner accepts both, and the invoice records the SPD install date so the next technician can check its status light.

Example: on a separate routine call at an older home with no service work, the same electrician mentions surge protection once, leaves a written note with the explanation and price, and does not bring it up again. The customer calls back two months later after a storm knocks out a neighbor's furnace board.

Install checklist

1. Confirm the adopted NEC edition and any local amendments to 230.67.
2. Choose a listed Type 1 or Type 2 device suited to the panel and service.
3. Mount it as part of the service equipment or immediately adjacent, with leads as short and straight as the instructions allow.
4. Use a dedicated breaker if the manufacturer requires one, and label it.
5. Verify grounding and bonding at the service; an SPD depends on them.
6. Show the customer the status indicator and record the install date on the invoice.
7. Register any manufacturer warranty for the customer.

Claims to avoid

• Do not tell a customer with no service work that the code requires a retrofit.
• Do not promise protection from direct lightning strikes.
• Do not imply an insurance requirement unless the customer's policy actually says so.
• Do not quote warranty amounts without the conditions.

Clear, honest framing builds the trust that sells larger jobs later, from panel upgrades to commercial maintenance contracts.