lightning & surge protection & earthing/grounding

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Lightning & Surge Protection &

Earthing/Grounding

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Data from space-based optical sensors reveal the uneven distribution of worldwide lightning strikes. Units: flashes/km2/yr.

Image credit: NSSTC Lightning Team.

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COMPARATIVE PROBABILITY OF DEATH FOR AN INDIVIDUAL PER YEAR OF EXPOSURE (ORDER OF MAGNITUDE)

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Source: BS 6651:1992

In Australia: Between 6 and 10 people are killed each year by lightning. Most common causes: - Playing golf- Swimming, sailing, fishing, being in large open areas

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Myths about lightningLIGHTNING NEVER STRIKES TWICE (Truth: it hits the Empire State Building about 25 times a year.)

RUBBER (TYRES) WILL INSULATE ME FROM LIGHTNING (Truth: it has travelled miles through space…a few inches of rubber mean nothing at all.)

YOU SHOULD NEVER TOUCH SOMEONE AFTER HE/SHE HAS BEEN HIT BY LIGHTNING (Truth: It is perfectly safe.)

LIGHTNING CAN BE PREVENTED (unconfirmed/sheer advertising.)

FIRST STRIKES FROM LIGHTNING CAN BE PREDICTED (unconfirmed/sheer advertising.)

NEW HIGH-TECH TYPES OF LIGHTNING RODS CAN CONTROL LIGHTNING (unconfirmed/sheer advertising.)

BOLT FROM THE BLUE (Misconception)

Source: National Lightning Safety Institute (USA)

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The localized nature of lightning

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“Bolt from the blue” phenomenon

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“Bolt from the blue” phenomenon

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The unpredictability of lightning

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Fairly accurate average distance

Ignore

Boltek StormTracker Lightning Detector- RF type detector

- Direction accurate if antenna installed correctly

- Distance only approximate indication: Strong strikes appear closer than what they really are, weak strikes appear further away.

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When is lightning an immediate threat?- AS1768 suggests 5 km

- New research in USA found distance between subsequent strikes greater than previously thought: frequently up to 8km and sometimes more

- NLSI recommends 30/30 rule: Employ safety measures / seek shelter when Flash-to-Bang time is 30 seconds or less (10 km); wait 30 minutes after last local lightning

- Sound of thunder travels approx. 1 km every 3 seconds

- Audible range of thunder approx. 8 – 13 km

- Safe shelters: Substantial buildings, fully metal enclosed vehicles, large metal sheds

- Unsafe shelters: TREES, vehicles with open sides or non-metal roofs / canopies, tents, fibre-glass cubicles, close to isolated towers / masts

- Surface arc: May be lethal up to 40m from object struck (step potential) –mitigated by good earthing

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Effects of lightning discharge currents in the ground

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Incorrect / Unnecessary: Air terminal on top of metal structure

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Incorrect / Unnecessary: Air terminal on top of metal structures

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Incorrect / Unnecessary: Air terminal on top of metal structures

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Incorrect earthing practice: Earth conductor coiled – high impedance

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Incorrect practice: Surge arrester not earthed adequately

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Incorrect practice: Surge arrester not earthed adequately

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Incorrect practice: Surge arrester earthing introduces surges again into wiring

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Incorrect practice: Surge arrester earthing introduces surges again into wiring

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Incorrect practice: Surge arrester earthing introduces surges again into wiring

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Interest: Plane hit by lightning

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