: Connecting non-current-carrying metalwork to the earth to prevent dangerous voltages on equipment casings. The standard specifically covers:
Historically, Singapore followed BS 7430. However, due to Singapore’s unique tropical climate (high humidity, lightning density, and corrosive soil conditions), local amendments were necessary. SS 551 tailors international standards to local soil resistivity, lightning risk profiles, and legal framework (Energy Market Authority – EMA requirements). ss 551 code of practice for earthing
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