Most people picture a lightning strike when they think about surge protection. Lightning is the dramatic version — but it causes a small minority of the surges that actually damage equipment. The majority are generated inside the building, dozens of times a day, by the equipment already plugged in.
Here is what surges actually are, where they come from, and what genuinely protects against them — including the part most homeowners and facility managers do not know: a power strip on the floor cannot protect the equipment that matters most.
What is an electrical surge?
A surge is a brief spike in voltage above the normal level — a fraction of a second in which your 120-volt circuit carries considerably more. Electronics are built for a fairly narrow voltage range, and voltage above that range breaks down insulation and degrades components.
Large surges destroy equipment outright. Smaller ones do something less obvious and, over time, more expensive: they wear components down gradually. A device that dies “for no reason” after two years has often been absorbing small surges its entire life.
Where surges come from
Inside the building — most of them
Any large motor starting or stopping creates a voltage disturbance on the circuits around it. In a home, that is your HVAC compressor, refrigerator, well pump, garage door opener, washer and dryer. In a commercial facility it is compressors, elevators, pumps, welders, and production equipment — larger loads producing larger disturbances, many times a day.
The utility grid
Switching operations, capacitor banks, downed lines, tree contact, and the moment power is restored after an outage — restoration surges are a common cause of equipment damage, which is why the failures often appear right when the lights come back on.
Lightning
It does not have to strike your building. A strike anywhere near the distribution system, or on overhead lines some distance away, can send a substantial surge down the line to you.
The two layers of protection
Effective surge protection is layered, and most buildings only have one layer — the wrong one on its own.
Layer one: whole-building surge protection at the panel
A surge protective device (SPD) installed at your electrical panel intercepts surges arriving from outside the building and diverts that energy to ground before it enters your branch circuits.
This is the layer almost nobody has, and it is the one that protects everything a plug strip cannot reach:
- HVAC systems and heat pumps — frequently the single most expensive item in the building
- Kitchen appliances, washers and dryers
- Well pumps and sump pumps
- LED lighting and dimmers — LED drivers are surge-sensitive and their early failure is often blamed on “cheap bulbs”
- Garage door openers
- EV chargers
- Hardwired equipment of every kind, including production machinery in commercial facilities
None of those plug into a power strip. All of them are exposed without panel-level protection.
Layer two: point-of-use protection
Plug-in surge protectors at the device handle what gets past the first layer and, importantly, what is generated inside the building downstream of the panel. Use these for computers, servers, televisions and AV equipment, network gear, and medical or lab equipment.
Point-of-use protection is worth having. It is simply not sufficient by itself.
Power strip or surge protector? They are not the same thing
This is the most common and most expensive misunderstanding.
A power strip is an extension cord with several outlets. It may have a switch and an overload breaker. It offers no surge protection whatsoever.
A surge protector contains components — typically metal oxide varistors — that divert excess voltage away from the connected equipment. It will state a joule rating on the packaging.
They look nearly identical on a shelf. If the packaging does not say “surge protector” and give a joule rating, it is a power strip, and it is protecting nothing.
New Jersey code now requires it on homes
This is no longer purely optional. The 2020 National Electrical Code, which New Jersey has adopted, requires a Type 1 or Type 2 surge protective device on services supplying dwelling units. In practice that means new homes and service or panel replacements require surge protection as part of the work, and later code editions have extended similar requirements to multifamily dwellings, hotel guest rooms, and certain care facilities.
Code cycles advance and local amendments exist, so we confirm current requirements for your specific project — but the direction is clear: surge protection has moved from an upsell to a baseline expectation.
What to look for in a surge protector
- Joule rating — how much energy it can absorb before it is used up. Higher is better; treat anything under a few hundred joules as minimal.
- Clamping voltage — the voltage at which it starts diverting. Lower means it acts sooner.
- Response time — faster is better.
- Indicator light — tells you the protection is still functional. Essential, for the reason below.
- UL 1449 listing — the relevant safety standard for surge protective devices.
Surge protectors wear out — and yours probably has
This is the detail almost everyone misses. Surge protectors are consumable. Every surge absorbed uses up capacity, and eventually the device stops protecting while continuing to distribute power perfectly well. It looks fine. It is doing nothing.
That plug strip behind your desk from 2016 is, in all likelihood, an expensive-looking extension cord at this point. Check the protection indicator light — if there is no light, or the light is off, replace it. Panel-mounted SPDs likewise have status indicators and should be checked periodically and replaced after a significant surge event.
Is surge protection worth it?
Run the arithmetic. Panel-level surge protection is a modest investment against HVAC equipment, appliances, and electronics that cost many times more — and against downtime, which for a business usually costs more than the damaged equipment.
For commercial facilities the case is stronger still: production equipment, servers, point-of-sale systems, and controls all sit exposed, and a single surge event can take out several at once along with a day of operations.
Have surge protection installed correctly
Nextgen Electric installs whole-building surge protection for homes and commercial facilities across North Jersey — panel-mounted SPDs, coordinated protection for sensitive equipment, and service upgrades where the existing panel cannot accommodate a device.
Call (201) 321-8949 or contact us for an assessment. If you are already planning a panel upgrade, that is the natural moment to add it — and depending on the scope of work, it may be required.
Want whole-house surge protection installed?
Nextgen Electric installs whole-building surge protection at the panel — part of our panel and service work. Call (201) 321-8949 or request a bid.
