Section 4: Fence Touch & Step Potential, Fault Clearance Time

Objectives

Understand risks associated with fences and boundary areas

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Introduction

This course focuses on critical electrical safety concepts related to Fence Touch Potential, Step Potential, and Fault Clearance Time in substations and electrical installations. Participants will gain a clear understanding of how dangerous voltage gradients develop during earth faults and how these can pose serious risks to personnel near fences, structures, and ground surfaces.

The course explains methods to evaluate and control fence touch and step potentials through proper earthing design, fencing practices, surface resistivity, and bonding techniques. It also covers Fault Clearance Time, emphasizing its role in limiting the duration of exposure to hazardous voltages and ensuring effective operation of protection systems.

Through practical examples, calculations, and industry best practices, learners will develop the skills needed to assess risks, improve safety around substations and electrical facilities, and ensure compliance with applicable electrical safety standards.