: The bonding of all non-current-carrying metal parts of equipment and installations to earth. This relates to the safety of human life, animals, and property, and is sometimes called “equipment earthing”.
The complete official text of is available for purchase and download through the Singapore Standards e-shop . SS 551:2022 - Singapore Standards
SS 551 is listed as a and compliance is generally required under the Electricity (Electrical Installations) Regulations .
Stabilizing voltage levels under normal conditions and preventing catastrophic damage during lightning strikes or surges. 2. Core Concepts of Electrical Earthing ss 551 code of practice for earthing
: Guidance on measuring and calculating soil resistance, which is vital for effective electrode placement.
SS 551 emphasizes the importance of . This involves connecting all extraneous conductive parts (like metal water pipes, gas lines, and structural steelwork) to the main earthing terminal. By doing so, all conductive parts in a building are kept at the same electrical potential, virtually eliminating the risk of electric shock if someone touches two metal surfaces simultaneously. 3. Integration with Lightning Protection
The standard also provides:
The primary objectives of the code are:
Always conduct physical soil resistivity testing before calculating rod depth.
For engineers and contractors, keeping this summary checklist handy ensures basic alignment with SS 551: : The bonding of all non-current-carrying metal parts
Chapter 13 of SS 551 is dedicated to corrosion prevention. The standard provides:
In the realm of electrical engineering and building safety, the primary objective of any electrical installation is to prevent hazards such as electric shock, fire, and equipment damage. At the heart of this safety infrastructure lies proper earthing (or grounding) and bonding. For professionals operating in Singapore and adopting similar international guidelines, serves as the foundational, authoritative standard .
In high-risk areas like bathrooms, laboratory spaces, or damp industrial floors, local supplementary bonding must connect all localized metal fixtures together to guarantee zero voltage variance. Earth Electrode Installation Standards SS 551:2022 - Singapore Standards SS 551 is
As technology advances—particularly with the growth of green energy installations, electric vehicle charging hubs, and hyperscale data centers—staying updated with the latest revisions of SS 551 remains a core duty for every electrical professional in the region.
Chapter 15 of SS 551 covers the inspection and testing of earthing systems. Regular testing is essential to verify that the earthing system continues to perform as designed and remains compliant with safety requirements.