Issuing body
IEEE
Latest edition
2013 (R2015)
Region
USA, Global
Equipment items
1
Scope
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.
Related standards (1)
Applied to 1 equipment item
Electrical Systems