Lightning and surge protection: check power, coax and outdoor cable paths

Start with the cables, not the damaged device

A television may connect to AC power, coax and a network cable. A home-office router may connect to outside communications infrastructure as well as a power supply. A gate controller may have long outdoor power, control and data routes. A panel surge device alone cannot describe the protection of that entire connected arrangement.

A Reddit owner reported damaged GFCI receptacles, light switches, a modem, router, Ethernet switches, televisions and an alarm system after a nearby lightning strike despite an Eaton protector at the main disconnect. That account supports taking a complete equipment inventory; it does not establish which cable or other path carried the damaging event.

Prepare an equipment-and-connection inventory from visible, accessible areas. Identify where each metallic service enters the building and which devices bridge power and signal systems. Do not remove covers or climb to inspect an antenna. The inventory gives the electrician and communications specialist a shared scope; it does not prove the path of a past lightning event.

Source: National Weather Service: Lightning Rods and complete protection systems · Huge lightening hit

Coordinate grounding and bonding at the entry

Bonding connects conductive systems to reduce hazardous differences in electrical potential. Have the qualified team review how power, communications protection and the building grounding system are coordinated at their entries, including the applicable intersystem bonding arrangement. An isolated new ground rod beside a cable protector is not a substitute for the required coordinated grounding and bonding design.

The National Weather Service explains that a complete lightning-protection system combines interception, a conductive path, grounding, bonding and protection for incoming power, data and communication lines. A panel SPD is one component with a different scope from that complete system. Where a full lightning-protection design is appropriate, use a specialist working to the applicable NFPA 780 and other governing standards, rather than treating a surge-device installation as that design.

Source: National Weather Service: Lightning Rods and complete protection systems

A protector must suit the signal it carries

Specify the actual interface before choosing a signal-line protector. Coax, telephone and Ethernet are not interchangeable connections; outdoor network equipment may also carry power over the data cable. The selected product must support the required service, equipment interface and installation environment. A protective accessory that prevents a link from operating is not an acceptable design outcome.

Eaton’s CHSPT2 instructions, for example, distinguish the AC module from a separate coax-protection module and give different environmental provisions. That supports checking each product’s intended role. It does not establish that this product family is the correct selection for every modern network or that any small inline accessory provides equivalent protection.

Source: Eaton: CHSPT2ULTRA product and technical resources

Illustrative review: a television and an outdoor camera

For a television, list its power connection, incoming coax and any wired network connection. Ask the proposal to identify which entry and downstream provisions address those paths. Keep the scope traceable to actual devices rather than a general promise to protect the entertainment system.

For an outdoor camera, trace the outdoor cable’s entry and connection to the indoor network equipment. The specialist should address the supported signal/power arrangement, environment and bonding design. Replacing copper with a suitable fiber link can change the conductive path, but it is a system-design choice that must account for power and every remaining metallic connection. This is a planning example, not an instruction to reroute existing wiring.

Assign the interfaces between trades

Name who supplies and installs each protector, who reviews the grounding and bonding arrangement, who tests signal operation and who keeps the final model records. A quotation limited to the panel SPD should say that communications entry work is excluded. If that work is needed, obtain a separate defined scope rather than assuming the cable provider or electrician included it.

At handover, request the device schedule, locations, product instructions and normal status indications. The owner should know which indicators are safely visible and whom to call for a change. Keep a diagram of the protected interfaces so a future router, antenna or gate replacement can be reviewed against the existing design.

Keep protection limits separate from the event investigation

Even a coordinated system cannot promise immunity from every lightning event. If damage occurs, prioritize safety and obtain an appropriate assessment before reusing damaged equipment. Do not infer an exact lightning path merely because one device failed and another survived.

Warranty evidence and insurer requirements belong in the separate records guide. The decision here is whether the proposed protection scope follows all relevant conductive connections and coordinates their bonding, rather than giving a panel device credit for work that was never included.

Put it into practice

A decision table to keep handy