In high-risk zones where the human body is highly vulnerable—such as bathrooms, swimming pools, and damp industrial floors—supplementary bonding conductors must interconnect all local exposed metalwork to minimize any possible voltage differences. 5. Inspection, Testing, and Maintenance
While Singapore Standards are generally voluntary in nature, they may be made mandatory by regulatory authorities. For SS 551, several regulations reference the standard:
: Establishes standards for recording earthing system details to ensure long-term safety and compliance. Notable Updates in the 2022 Revision
The standard path to validating an earth electrode's effectiveness is the (3-terminal test). ss 551 code of practice for earthing
Chapter 7 of SS 551 covers industrial and commercial distribution systems and includes measures to be taken to reduce the effects of high frequency interference and low voltage system issues.
Ensure inspection chambers are built to facilitate regular maintenance and testing by LEWs.
IEEE 80 (for HV substations), BS 7671 (for final circuits), and SS 555 (for lightning protection). In high-risk zones where the human body is
| Installation type | Maximum interval | |-------------------|------------------| | Residential | 5 years | | Commercial / Offices | 3 years | | Industrial / High-risk | 1 year | | Construction sites | 3 months |
SS 551 distinguishes between two fundamental types of earthing:
What is the (e.g., standard commercial building, industrial plant, or data center)? For SS 551, several regulations reference the standard:
The 2022 revision of SS 551 added additional information on documentation requirements. Proper documentation of earthing system design, installation, and testing results is essential for regulatory compliance and future maintenance.
Maintaining clear records of the earthing layout and test results for future audits and troubleshooting. 5. Why Compliance Matters
It provides a stable reference point for the electrical system, helping to manage voltage surges and lightning strikes. 2. Key Components of an Earthing System