Public Warning System (Singapore)

The Public Warning System (PWS) is a network of civil defense sirens installed by the Singapore Civil Defence Force on over 2,000 strategic points in Singapore to warn Singaporeans of impending dangers, air raids and atomic bomb blasts.

[1] When it was a British colony, Singapore had mechanically-powered air raid sirens over the island, but the system did not work perfectly and was defunct after World War II.

Then, in the 1980s, the SCDF planned a network of powerful electrical sirens throughout Singapore to warn the people of natural disasters and air raids.

Also built as on ground sirens in certain areas of Singapore: Yew Tee Industrial Estate, Sungei Kadut, Adam Road Mid-Sub Power Station, Mandai Air Base, an unknown factory in northern Woodlands and on the compounds of Woodlands Fire Station.

"Zig-Zag": Four horns joined together in a "zig zag" pattern on both left right sides of a thin short steel pole, this is the default configuration of the ECN 600 completed in 2009 it is currently on the rooftop of Clementi Fire Station.

In 2009, Hörmann Warnsysteme GmbH of Germany uses sirens made for the SCDF in other countries, with their default configuration having its horns attached to front and rear of the pole.