Etouch50=(1000+1.5Cs⋅ρs)0.116tscap E sub touch50 end-sub equals open paren 1000 plus 1.5 cap C sub s center dot rho sub s close paren the fraction with numerator 0.116 and denominator the square root of t sub s end-root end-fraction represents the nominal resistance of a human body ( Ωcap omega ) from hand to foot. ρsrho sub s is the surface material resistivity ( ), typically a crushed rock layer. Cscap C sub s
The 2013 version introduced several critical updates over previous iterations (such as the 2000 edition), making the PDF document indispensable for modern engineering:
Note: Always use the official IEEE Xplore site to ensure you are accessing the latest, most accurate version of the standard. Summary of 2013 Revision Improvements
The IEEE Standard 80-2013 provides several benefits, including: ieee standard 80-2013 pdf
For professionals, having the full IEEE Std 80-2013 PDF is invaluable because:
The standard reinforces the importance of a high-resistivity surface layer (crushed rock) on substation surfaces. It provides corrected formulas for the derating factor (Cs) that are easier to apply iteratively. The 2013 version explicitly warns engineers about the reduction in rock resistivity when wet or contaminated.
This standard provides guidelines for the safety of electrical installations in industrial and commercial power systems, including power generation, transmission, and distribution. Etouch50=(1000+1
It provides the exact, vetted equations for grounding resistance and voltage calculation, which are often implemented in specialized software.
When a fault occurs, current flows into the earth, elevating the ground potential. The standard identifies several critical shock pathways:
Establish the fault current magnitude, fault duration, and maximum allowable touch/step voltages. Summary of 2013 Revision Improvements The IEEE Standard
Calculate the initial grid resistance ( Rgcap R sub g ) to ensure it's low enough. 3. Calculation of Tolerable Voltages
Estimate the total electrical resistance of the grounding grid to remote earth.
IEEE Std 80-2013, the IEEE Guide for Safety in AC Substation Grounding , is the primary global standard for designing safe, effective earthing systems to protect personnel from electric shock during fault conditions. This critical 2013 update refines safety criteria, introduces standardized benchmark cases, and updates equations for calculating touch and step voltages. Review the full standard on IEEE Xplore . IEEE-std80.pdf - Slideshare