The requirements for equipment grounding electrodes are found in NESC Rule 94. These are installed for each distribution transformer or lightning arrester instal-lation. The NESC requires a minimum electrode nominal diameter of 1/2" or 5/8", depending upon material, and a. Today, we're diving deep into the world of distribution box grounding, breaking down the standards, and shining a light on those sneaky mistakes that even experienced electricians sometimes make. SEC Distribution System extends from the MV (33 kV, 13. 8 kV) feeder outlets of HV / MV Substations down to SEC Customer interface including KWH-Meters and meter boxes. To provide. ate compliance with relevant national and international standards as well as statutory legislation and licence condit s. has been issued to align wit latest releases of the ESQCR, BS EN 50522, ENA TS 41-2 N Distribution Substation Earthing Design ool. Amendments to the standard earthing. THAN 8 FT FROM THE FENCE. THE FENCE SHALL BE GROUNDED SEPARATELY FROM THE GRID UNLESS OTHERWISE NOTED ON THE A PROPRIATE PROJECT DRAWING. SEE APPLICATION "S",THIS DRAWING, FOR REQUIREMENTS FOR HIGH VOLTAGE TOWERS AND PO ES D BY GROUNDING ANALYSIS. Knowledge of the various types of system grounding and performance characteristics is critical when designing or operating an electrical system. The voltage, system arrangement, loads connected, and continuity of. This paper is intended to give an overview of the vari-ous relationships between neutral currents, ground currents, electrode impedances and voltage potentials that are en-countered in the grounding of multigrounded wye distribu-tion systems.