Explainer: Why did lightning bolt skip protection rod at top of Queenstown HDB block? Are buildings in Singapore safe?

The photo, taken by a Facebook user named Mak Wei Seng, showed a lightning bolt striking the side of Block 53, a 43-storey block of Housing and Development Board flats on Strathmore Avenue.

Lightning protection systems work by providing a low-resistance path for electricity to travel to the earth where it can dissipate safely. “For a tall building, the upper part of the down-conductors and the horizontal bonding rings of the building also function as a part of the air termination system to intercept lightning that strikes the sides of the buildings.”

As for the equipotential zone, he explained: “All metallic parts that a resident touch or stand on are connected or bonded together to have the same voltage potential. There will be no electric shock hazard when there is no voltage difference between parts of a human body.”Analysing the photo, Emeritus Professor Liew Ah Choy from the National University of Singapore, a lightning protection expert, said that there was “nothing very unusual”.

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