Engineering
Lightning Doesn't Have to Hit You to Hurt You
The storm rolls over Norbrook, the flash lands somewhere up in the hills, and the next morning your neighbour's WiFi is dead, your fridge is making a noise like a small helicopter, and the gate motor has achieved a higher state of consciousness (it's unresponsive). Nobody's roof was touched. Everyone's equipment is fried.
Welcome to the indirect strike — the most common way lightning damages buildings in St Andrew, and the one almost nobody protects against.
The physics, minus the drama
When lightning hits anything — a pole on Constant Spring Road, a tree two properties over, a tower on the ridge — enormous current dumps into the ground and induces surges in every conductor nearby. Your building is full of conductors that lead somewhere:
- Power lines. The surge rides the grid straight into your main panel and fans out through every circuit.
- Phone and data lines. ADSL-era copper, outdoor cameras' cables, gate intercom lines — all outdoor paths in.
- The earth itself. Ground potential rise means the surge can arrive through your grounding if the system was never designed for it.
Distance helps, but not the way people hope. A strike a few hundred metres away is close enough to ruin your evening.
Why the little surge bar doesn't save you
That strip under the desk with the reassuring little switch is not a lightning plan. Surge protection that actually works in a lightning climate is layered:
- At the panel — a Type 1/2 surge protection device intercepting the surge where power enters the building
- At sub-panels and critical circuits — layered downstream protection
- At the device — point-of-use protection for the things you genuinely can't lose
- On data lines — the surge arriving on a camera cable doesn't care that your power was protected
And all of it depends on the same thing: a real, measured, low-resistance earth to dump the energy into. An SPD with a bad earth is a very small lightning rod pointed at your server.
How we approach it
Innovera treats surge protection as a system — panel-level SPDs, downstream layers, data-line protection, and the earthing the whole thing discharges into. One afternoon of engineering versus the recurring October equipment budget. — most buildings already own the optimistic plastic strip.