| Phase conductor cross-section (mm²) | Minimum PE cross-section (mm²) | |--------------------------------------|--------------------------------| | ≤ 16 | Same as phase | | 25 – 35 | 16 | | > 35 | Half of phase conductor (rounded up) |
SS 551 provides detailed specifications for components and design to achieve a low-impedance path to the ground: 07) - SS 551 - 2009 (Earthing) | PDF - Scribd ss 551 code of practice for earthing
Earthing is a safety measure that involves connecting electrical systems and equipment to the earth, providing a safe path for electrical currents to flow to the ground in case of a fault or short circuit. The primary purpose of earthing is to: | Phase conductor cross-section (mm²) | Minimum PE
IEEE 80 (for HV substations), BS 7671 (for final circuits), and SS 555 (for lightning protection). BS 7671 (for final circuits)
SS 551 Code of Practice for Earthing is a Singapore Standard that provides comprehensive guidance on the design, installation, and maintenance of earthing systems for land-based electrical installations.