Glass fibre does not conduct a lightning surge, while the powered ONT and router remain connected to household electricity. Aerial fibre and lightning therefore needs the fibre path separated from the electrical risks around its active equipment.

Quick Answer

The optical fibre strand that carries data is non-conductive, but an aerial fibre service is a complete installation. Its cable may include metallic strength or trace elements, and the ONT, router, power supplies, Ethernet, and building wiring create electrical paths. Ask the network provider and a qualified electrical professional how the exact installation is protected.

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Map the fibre system

Identify the outdoor drop, entry box, indoor fibre lead, ONT, router, Ethernet switches, access points, phones, televisions, PCs, and their power adapters. Do not bend, disconnect, stare into, or clean fibre connectors without provider guidance.

Find out whether the aerial cable construction has metallic members and how they terminate. Do not earth, cut, or alter provider cable yourself. The provider owns the service method and should confirm its lightning and bonding requirements.

The ONT and router plug into mains or backup power. Their Ethernet ports connect to indoor equipment through copper conductors. A nearby event can affect those electrical paths even when light in the fibre remains isolated.

Protect power and data as one network

Use a safe earthed supply and surge protection selected for the installation. Have a registered electrician assess fixed wiring, earthing, bonding, and distribution-board protection.

Do not insert an arbitrary Ethernet protector. It must support the link speed, PoE where used, pairs, earthing design, and installation. A poor inline device can reduce network performance or create another unsafe path.

If you unplug before a storm, do it before dangerous conditions arrive and only through a safe plan that considers power and copper data links. Never handle outdoor or electrical connections during active lightning.

After an event

Do not power burnt, wet, cracked, or hot equipment. Photograph the arrangement and contact the network provider for the ONT and service line. Use the insurer or qualified technician route for your router and connected devices.

Test power adapter, Ethernet cable, router port, and device path separately after the installation is declared safe. An online light on the ONT does not prove every Ethernet port survived.

Keep provider account and fault-reference details off the public network label. You need quick support access without exposing customer information beside the router.

FAQ

Can lightning travel through glass fibre?

The glass data strand does not conduct electricity. The complete aerial cable and powered equipment can include other electrical or metallic paths that need assessment.

Should I protect the ONT and router?

Yes, within a coordinated plan for their mains, backup, Ethernet, building wiring, and provider installation. Use exact device and professional guidance.

Can I replace the ONT myself?

Usually the service provider controls and configures the ONT. Contact it before disconnecting, replacing, or altering fibre equipment.

Map the fibre, power, and Ethernet paths, then coordinate provider guidance with a qualified electrical assessment before the next storm.