The complete official text of is available for purchase and download through the Singapore Standards e-shop . SS 551:2022 - Singapore Standards
: Integration of the earthing system with lightning protection systems (governed by the SS 555 series).
: Improved guidance on the interface between Low Voltage (LV) and High Voltage (HV) substations within the same building.
The MET acts as the "hub" for the earthing system. All protective conductors and bonding conductors are brought to this point to ensure equipotentiality across the entire building. Protective Equipotential Bonding ss 551 code of practice for earthing
Connecting non-current-carrying metalwork to the earth to ensure that in the event of a fault, human beings are not exposed to fatal voltages. 2. Key Objectives and Scope of SS 551
The 2022 revision introduced several key updates to reflect modern electrical infrastructure needs:
#SS551 #Earthing #ElectricalSafety #CodeOfPractice #SingaporeStandards #ElectricalEngineering #SafetyFirst The complete official text of is available for
Factors influencing earthing system design, including soil resistivity, current density, and fault levels.
The standard to several specialized environments, including: Ships, aircraft, or offshore installations. Medical equipment earthing. Internal earthing of equipment or functional earthing.
SS 551 highlights that an earthing system is not merely a one-time installation but requires ongoing maintenance. The standard provides guidance for: The MET acts as the "hub" for the earthing system
SS 551:2022 is the definitive code of practice for earthing in Singapore. It provides a comprehensive, systematic, and safety-focused approach to designing, installing, and maintaining earthing systems for land-based electrical installations. For anyone involved in electrical engineering in Singapore—from design consultants and contractors to facility managers and safety practitioners—a thorough understanding of SS 551 is not just a regulatory requirement but a fundamental responsibility in safeguarding lives and property from the hazards of electricity.
The earthing conductor links the earth electrodes to the Main Earthing Terminal (MET) of the installation. SS 551 dictates that these conductors must be sized appropriately to withstand maximum expected fault currents without overheating or degrading. Copper and galvanized steel are the standard materials, with cross-sectional areas calculated based on the fault duration and adiabatic equations. 3. Protective Equipotential Bonding
Regular inspection and maintenance are essential for ensuring the long-term safety and reliability of the system. A sample inspection checklist is provided in of the standard: "Ground mounted plant installation model inspection form".
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