Category
Electrical Systems
Subcategory
Earthing
Applicable standards
3
Issuing bodies
3
Description
Substation / plant earthing grid design — IEEE 80 / IEC 60364 / IS 3043.
Applicable Standards (3)
IEC — 1 standard
IEC 60364 (series)
Low-voltage electrical installations
Design, selection and erection of LV electrical installations in buildings/industry.
IEEE — 1 standard
IEEE 80
Guide for Safety in AC Substation Grounding
Design of substation grounding for personnel safety — step/touch voltage.
Key requirements (7)
- Substation grounding system safety.
- Step voltage and touch voltage limits derived from body resistance and fault duration.
- Allowable touch voltage: E_touch = (1000 + 1.5·ρs)·0.116/√t (Volts) — 50 kg body, fault duration t.
- Ground grid mesh design via equations 89–94 for IGS factor and step voltage.
- Soil resistivity testing (Wenner 4-pin method) before design.
- Ground rod: 3 m × 16 mm Cu-clad steel typical; rebar at substation periphery.
- Conductor sizing: A = I·√(t·αρ/(TCAP·log((Ko+Tm)/(Ko+Ta)))) — Onderdonk derived.
BIS — 1 standard
IS 3043
Code of Practice for Earthing
Indian earthing system design — system, equipment, and lightning earthing.