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Surge protection for outdoor cameras and panels in storm-prone markets

By Ron Broussard

TL;DR: Surge protection works best when you treat the security system as a whole. Protect the power and signal paths that can carry a surge into the equipment, use protectors designed for the specific circuit, and follow the manufacturer’s grounding and bonding requirements. Outdoor runs and between-building connections deserve extra attention. No surge protector makes equipment lightning-proof, but a properly designed protection system can reduce the risk of damage to cameras, switches, panels, and other connected equipment.

A storm rolls through and suddenly three cameras on the parking lot side are offline, a PoE switch has a dead port, or an alarm panel won’t power up. The equipment may be replaceable, but repeated storm damage creates downtime, service calls, and frustrated customers.

Surge protection starts with understanding how damaging voltage can reach the system in the first place.

Why do security systems fail after storms?

Security equipment can be damaged after storms even when lightning never strikes the camera, panel, or building directly. Surges can reach equipment through power, data, and other connected wiring, and differences in electrical potential between connected points can also stress equipment.

Three surge paths are especially important to understand:

  • Induced surges on outdoor wiring. Nearby lightning can induce voltage on conductive cabling even without a direct strike. Outdoor Ethernet, coax, control wiring, and between-building runs are examples of paths that can carry that surge toward connected equipment.
  • Utility-side power events. Outages, switching events, and other disturbances on the AC supply can expose connected equipment to transient overvoltage. That makes AC-side surge protection part of the system, not just protection on the low-voltage wiring.
  • Differences in electrical potential between connected points. During lightning activity, voltage differences can develop between grounding points or structures. Conductive cabling between those points can become part of the path, which is one reason grounding, bonding, and between-building connections need careful design.

U.S. lightning activity reached an eight-year high in 2025, with 252 million lightning events recorded, according to Vaisala Xweather. Texas recorded the nation’s highest total lightning count, and Louisiana ranked third in lightning density. For contractors working in Gulf Coast and other storm-prone markets, that makes surge protection a recurring part of the job, not a one-time add-on.

“After a major storm, we typically see contractors coming back to replace alarm control panels, power supplies, communicators, and cameras damaged by lightning strikes and power surges. One of the most common oversights is inadequate surge protection on low-voltage wiring, including network, camera, and communication lines. Contractors often protect the AC power but overlook the other paths a surge can take into the system.”

Mike Capulli, Security Data Supply

The rule: protect every path a surge can take

A surge protector only protects the circuit or path it is designed for. Protecting an outdoor Ethernet run does not protect the AC power feeding the switch or NVR, and AC protection does not protect data, coax, or other connected wiring. Good surge protection starts by identifying the conductive paths that connect to the equipment and deciding which ones need protection.

On a typical commercial security system, those paths can include:

  • AC power. NVRs, PoE switches, power supplies, alarm panels, and other head-end equipment can all be exposed through the AC supply. Use surge protection designed and listed for the specific AC application.
  • Ethernet and PoE. Outdoor cameras, network devices, and other equipment connected over copper Ethernet can carry surge energy back toward connected electronics. Use a protector that supports the data rate and PoE requirements of the equipment.
  • Coax and antenna connections. Legacy camera systems, RF equipment, and some communicator installations may include coaxial or antenna connections that need their own circuit-appropriate protection.
  • Communicator and telephone circuits. Where phone, communicator, or other external signaling circuits connect to a panel, evaluate surge protection for those specific circuits.
  • Other outdoor or between-building wiring. RS-485, gate controls, outdoor readers, intrusion wiring, and other conductive field circuits may also provide a path into connected equipment.

Surge protectors aren’t interchangeable across circuit types. Match the protector to the voltage, signaling method, data rate, PoE requirements, and other specifications of the circuit you’re protecting.

Security Data Supply franchises distribute DITEK surge protection for applications including AC power, data, coax, and communication circuits. Bring the equipment and circuit information to your SDS franchise so the team can help narrow down protector options for the job, from the jack to the rack.

Outdoor PoE runs: protect both ends

For exposed outdoor PoE runs, protect both ends of the cable: one protector near the camera and another on the building side before the cable reaches the connected network equipment. DITEK identifies protecting both ends of a cable or wire run as a surge-protection best practice.

Why both ends? The outdoor cable connects two pieces of equipment that can both be exposed to surge energy on the run. Protection only at the head end doesn’t provide protection at the camera end, and protection only at the camera doesn’t provide protection where the cable enters the building or reaches the network equipment.

A typical protection layout for an exposed outdoor PoE camera run looks like this:

  • At the camera: Install a PoE-rated surge protector near the camera or mounting point, following the manufacturer’s requirements for placement, enclosure, grounding, and bonding.
  • At the building side: Install protection where the outdoor cable enters the building or before it reaches the connected network equipment.
  • Match the protector to the PoE and network requirements. Confirm that it supports the PoE standard and Ethernet speed required by the camera and network.

Between-building runs deserve extra attention because the cable connects equipment served by different structures and grounding systems. Protect at each building entry and follow the grounding and bonding requirements at each structure.

Fiber is also worth considering for between-building network connections. Unlike copper Ethernet, fiber doesn’t provide a conductive path between the network equipment at each end.

Surge protection doesn’t replace proper outdoor cabling. Use cable rated for the environment and installation method, whether that’s outdoor exposure, wet conditions, or direct burial. For more on cable selection and PoE requirements, see our Cat5e vs. Cat6 vs. Cat6A for PoE Camera Installs guide.

Why grounding and bonding matter

A surge protector needs the grounding and bonding conditions specified by the manufacturer to perform as intended. Grounding and bonding give surge energy a controlled path, and a poor connection limits the protector’s ability to manage a surge. Installing the right protector without following its grounding and bonding requirements can leave the equipment more exposed than expected.

The principles that make grounding work for surge protection:

  • Keep grounding and bonding coordinated. Surge protectors, equipment, shields, and other conductive components need to be grounded or bonded as required by the equipment manufacturer, the system design, and the applicable electrical code. Avoid creating independent grounding arrangements that conflict with those requirements.
  • Keep grounding conductors short and direct. Extra length and unnecessary bends can reduce surge-protection performance. Follow the protector manufacturer’s instructions for conductor size, routing, and connection point.
  • Don’t add an isolated ground electrode as a shortcut. Remote poles, structures, and grounding electrodes can introduce additional bonding requirements. Follow the applicable NEC requirements, project design, and manufacturer instructions rather than treating a separate ground rod as a standalone fix.
  • Check the installation, don’t assume it. On service calls and takeovers, inspect the surge protector installation and verify that its grounding and bonding connections are intact. Look for loose connections, corrosion, physical damage, or previous changes to the system.

Grounding and bonding requirements come from the manufacturer’s instructions and the NEC as adopted in your jurisdiction. This guide is not a code interpretation. When requirements are unclear, confirm them with the AHJ.

Protecting alarm panels, power supplies, and head-end equipment

Alarm panels, power supplies, NVRs, switches, and other head-end equipment can have more than one path for surge energy to reach them. Start with the AC supply, then look at the conductive field and communication circuits connected to the equipment. Battery backup and UPS units serve a different purpose and shouldn’t be treated as a substitute for a complete surge-protection plan.

Alarm panels. Evaluate the AC input along with communicator, telephone, and conductive field circuits that leave the building or connect to exposed equipment. Check the panel and surge-protector manufacturers’ documentation before selecting and installing protection. Fire alarm systems also have specific primary and secondary power requirements, so surge protection shouldn’t be confused with standby-power design. For that side of the job, see our Fire Alarm Battery Backup Calculations guide.

Power supplies. Access control and camera power supplies, including Altronix products distributed by Security Data Supply, can be exposed through the AC supply as well as connected field wiring. If low-voltage circuits leave the building or connect to exposed outdoor equipment, evaluate whether circuit-appropriate surge protection is needed on those paths too.

NVRs, switches, and network gear. A properly sized UPS keeps head-end equipment running during an outage. Size it for the actual connected load and required runtime, including the PoE switch and its camera load, not just the NVR. Backing up the recorder alone won’t keep cameras online. Some UPS products also provide AC surge protection, but that doesn’t protect Ethernet, coax, or other signal wiring connected to the equipment. Security Data Supply franchises distribute Minuteman UPS products for head-end applications.

Hurricane prep beyond surge protection

Hurricane-season prep goes beyond surge protection. Wind, water intrusion, and extended outages can affect security systems in ways a surge protector can’t address, so contractors should also think about the physical installation, backup power, and what needs to be checked after the storm.

Before the storm (or during the original install):

  • Mounting. Use mounting hardware and structures appropriate for the installation and expected exposure. A camera can still have power after a storm and be useless if the mount moved enough to change its field of view.
  • Water entry. Seal cable entries and conduit penetrations to the equipment and enclosure manufacturers’ requirements. Drip loops help keep water from following the cable into an enclosure or device.
  • Outdoor enclosures. Install surge protectors, terminations, and connections in enclosures rated for the environment when the components themselves aren’t rated for that exposure.
  • Battery and UPS health. Check standby batteries and UPS battery condition before storm season. Backup power is a lot more useful when you know its condition before the outage starts.

After the storm:

  • Check the NVR or VMS for cameras that are offline, showing errors, or no longer recording normally.
  • Inspect surge protectors for damage or status indicators showing that protection has been compromised. Replace any that have taken a hit, per the manufacturer’s guidance.
  • Look for water intrusion in junction boxes, enclosures, connectors, and camera housings.
  • Verify camera position and field of view. A camera may still be online even if wind moved the mount.
  • Inspect accessible grounding and bonding connections for damage, looseness, corrosion, or other visible problems.
  • Verify alarm and communication functions according to the system’s normal service and testing procedures.

A post-storm inspection can also become a recurring service offering. Contractors can build a storm-response checklist into maintenance agreements or offer inspections after major weather events, giving customers a defined process for checking cameras, panels, backup power, surge protection, and outdoor connections.

What to bring to the counter for a surge protection order

You don’t need a finished design to talk with your local Security Data Supply franchise, but the more you know about the equipment and exposed wiring, the easier it is for the franchise team to help narrow down the appropriate protector options.

  • Devices and model numbers: Cameras, readers, panels, switches, power supplies, communicators, and other equipment connected to outdoor or between-building wiring.
  • Outdoor and between-building runs: Note which runs go to poles, exterior devices, gates, or other buildings, along with whether they’re Ethernet, coax, RS-485, or another type of wiring.
  • PoE and network requirements: Know the PoE standard or power requirement and Ethernet speed for the cameras or other network devices being protected.
  • Head-end equipment: NVRs, switches, panels, power supplies, and communicators, including AC requirements and which equipment needs battery or UPS backup.
  • Communication paths: Note whether the system uses IP, cellular, telephone, antenna/coax connections, or a combination.
  • Site layout and grounding information you already have: Let the franchise team know about separate buildings, remote poles, or other unusual site conditions. Bring the project grounding/bonding details if they’re available.
  • Project specifications: Bring any requirements for surge protection, product listings, manufacturers, grounding, or installation methods.
  • Existing protection: If this is a repair, takeover, or repeat storm-damage call, bring the model numbers or photos of any surge protectors already installed and note what equipment failed.

With those details, your SDS franchise can help narrow down surge-protection options for the circuits and equipment on the job.

Protect every path into the system. Bring your equipment list and outdoor run details to your local Security Data Supply franchise.

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Frequently asked questions

How do I protect PoE security cameras from lightning?

Treat it as a system. Protect both ends of each exposed outdoor PoE run, protect the AC supply to the switch and NVR, and follow the protector manufacturer’s grounding and bonding instructions so surge energy has a controlled path. No surge protector makes a camera lightning-proof, but properly selected and installed protection can reduce the risk of surge damage.

Do security cameras need surge protectors?

Outdoor cameras connected over exposed copper cabling are strong candidates for surge protection, especially in lightning-prone markets. The cabling provides a conductive path between the camera and the equipment inside the building, so the AC side and other exposed circuits should be evaluated too.

How do I surge protect an alarm panel?

Start by identifying the conductive paths connected to the alarm panel, including its AC supply, communicator or telephone connection, and field wiring that leaves the building or connects to exposed equipment. Use surge protection designed for the specific circuit and follow both the panel and surge-protector manufacturers’ instructions. Surge protection is separate from the panel’s standby-battery requirements.

Where do I install a PoE surge protector, at the camera or the switch?

For an exposed outdoor PoE run, protect both ends of the cable. Install one protector near the camera and another on the building side before the cable reaches the connected network equipment, following the protector manufacturer’s placement, grounding, and bonding instructions.

How important is grounding for surge protection?

Grounding and bonding are critical to surge-protection performance. Follow the protector manufacturer’s requirements for conductor size, routing, and connection points, and don’t add a remote ground rod as a shortcut without accounting for bonding requirements and the applicable electrical code.

Can a UPS protect security equipment from surges?

A UPS and a surge protector do different jobs. A properly sized UPS provides backup power to connected equipment during an outage, and some UPS products also include AC surge protection. But that doesn’t automatically protect Ethernet, coax, telephone, or other signal wiring connected to the equipment. Evaluate those paths separately.

Why did my cameras fail after a storm?

A camera can fail after a storm even without taking a direct lightning strike. Surge energy can reach connected equipment through outdoor copper cabling, AC power, or other conductive wiring. Water intrusion, physical movement, power loss, damaged connections, and other storm effects can also cause cameras to go offline, so don’t assume every post-storm failure has the same cause.

About the author

Ron Broussard is Chief Executive Officer of Security Data Supply and has more than 30 years of experience in the security industry. He has held executive leadership roles across distribution and manufacturing, giving him a broad perspective on the challenges contractors, integrators, and distributors face every day. At Security Data Supply, he guides the company’s franchise network, vendor relationships, and long-term growth strategy.

Methodology

This guide combines Security Data Supply’s distribution experience with published lightning data and surge-protection guidance from equipment manufacturers. It describes general system-protection principles and is not an electrical code interpretation. Product requirements vary by application, so contractors should confirm the surge protector and equipment manufacturers’ installation instructions, project specifications, applicable electrical code, and AHJ requirements before installation.

Sources and further reading