Medium-Voltage Safety Training

Lesson 1 • Defining Medium-Voltage Range

Covers voltage classifications from low to high voltage and where medium voltage fits. Provides the baseline terminology used throughout the entire course.

Lesson 2 • Regulatory and Standards Overview

Introduces the regulatory framework governing MV work, including safety standards and employer obligations. Sets the compliance context for all subsequent safety practices.

Lesson 3 • Electrical Fundamentals Review

Reviews Ohm's law, power calculations, and AC circuit behavior at medium-voltage levels. Reinforces the physics underlying MV hazards and protective device operation.

Lesson 4 • System Configurations and Topologies

Explains radial, loop, and network distribution topologies used in MV systems. Topology awareness supports safe isolation and switching decisions.

Lesson 1 • Arc Flash Physics and Energy

Describes arc flash initiation, plasma temperatures, and incident energy release at MV levels. Establishes the science behind arc flash boundaries and PPE selection.

Lesson 2 • Secondary and Environmental Hazards

Covers induced voltage, capacitive stored energy, toxic gases, and fire risks in MV environments. Broadens hazard awareness beyond direct electrical contact.

Lesson 3 • Hazard Assessment and Risk Ranking

Applies a structured risk matrix to evaluate likelihood and severity of MV hazards. Produces a prioritized hazard profile used in job planning and PPE selection.

Lesson 4 • Arc Flash Boundary Concepts

Defines limited, restricted, and arc flash protection boundaries and their calculation basis. Boundary knowledge directly governs worker approach distances in later chapters.

Lesson 1 • PPE Categories and Ratings

Maps arc-rated PPE categories to incident energy levels and MV exposure scenarios. Correct category selection is the primary defense against arc flash injury.

Lesson 2 • Insulating Gloves and Sleeves

Covers voltage classes, leather protectors, and inspection protocols for rubber insulating gloves. Gloves are the most critical contact protection for MV tasks.

Lesson 3 • PPE Inspection, Care, and Retirement

Establishes pre-use inspection criteria, cleaning procedures, and retirement triggers for all MV PPE. Defective equipment must be removed from service before it causes injury.

Lesson 4 • Insulating Tools and Equipment

Identifies hot sticks, insulated hand tools, and live-line tool ratings for MV applications. Proper tool selection prevents inadvertent contact with energized conductors.

Lesson 1 • Energy Control Program Principles

Defines the purpose, scope, and required elements of a written energy control program. A compliant program is the administrative foundation for all LOTO activities.

Lesson 2 • Verification of Zero Energy State

Applies test-before-touch protocol using rated voltage detectors to confirm de-energization. Verification is the final barrier before physical contact with isolated equipment.

Lesson 3 • Restoring Equipment to Service

Sequences lock removal, personnel clearance, and re-energization steps after work completion. Improper restoration is a leading cause of post-maintenance electrical incidents.

Lesson 4 • De-energization and Isolation Steps

Details the sequence for opening disconnects, racking out breakers, and verifying open position. Correct sequence prevents switching errors that could energize adjacent equipment.

Lesson 5 • Lockout Device Application

Covers lock selection, hasp use for group lockout, and tag placement on MV isolation points. Each authorized worker must apply a personal lock before work begins.

Lesson 1 • Job Briefing and Pre-Task Planning

Structures a pre-task job briefing covering hazards, controls, roles, and emergency actions. Briefings align the entire crew before any MV work begins.

Lesson 2 • Working on Energized MV Equipment

Applies safe work methods including insulated tools, barriers, and body positioning during live work. Technique discipline reduces inadvertent contact probability to the lowest achievable level.

Lesson 3 • Energized Work Justification

Establishes the conditions under which energized MV work is permissible and requires written justification. Limiting energized work is the highest-priority risk reduction strategy.

Lesson 4 • Two-Person Rule and Standby

Explains when a second qualified worker or safety observer is required for MV tasks. The two-person rule ensures immediate response capability in emergencies.

Lesson 1 • Engineering Controls for Arc Flash

Covers remote racking, arc flash detection relays, and current-limiting fuses as incident energy reducers. Engineering controls are preferred over PPE as the primary mitigation layer.

Lesson 2 • Arc Flash Study Process

Outlines the data collection, modeling, and calculation steps in a formal arc flash hazard study. A completed study is the basis for all arc flash labels and PPE requirements.

Lesson 3 • Arc Flash Labels and Equipment Marking

Defines required label content including incident energy, PPE category, and boundary distances. Labels communicate hazard data to workers at the point of exposure.

Lesson 4 • Protective Device Coordination

Explains how relay settings and fuse coordination affect arc flash clearing time and incident energy. Faster clearing times directly reduce incident energy at the worker's position.

Lesson 1 • Normal and Emergency Switching

Distinguishes planned switching sequences from emergency switching under abnormal system conditions. Emergency switching requires faster decisions with the same procedural discipline.

Lesson 2 • Switching Communication Protocols

Establishes radio, phone, and face-to-face communication standards during switching operations. Clear communication prevents misidentification of equipment and switching errors.

Lesson 3 • Switching Order Fundamentals

Defines the purpose, format, and authorization chain for written switching orders. Formal orders prevent improvised switching that causes outages and injuries.

Lesson 4 • Interlocks and Anti-Reclose Features

Explains mechanical and electrical interlocks that prevent out-of-sequence switching operations. Interlocks are the last engineered defense against switching errors.

Lesson 1 • Incident Investigation and Reporting

Structures a post-incident investigation to identify root causes and prevent recurrence. Accurate reporting fulfills regulatory obligations and drives systemic safety improvements.

Lesson 2 • Victim Rescue Without Contact

Demonstrates safe victim separation from energized sources using insulated tools and de-energization. Rescuers must never become secondary victims through direct contact.

Lesson 3 • First Aid for Electrical Injuries

Covers CPR, burn management, and shock treatment specific to electrical injury patterns. Electrical injuries have unique internal damage patterns requiring specific first aid priorities.

Lesson 4 • Fire Response in MV Environments

Applies correct extinguisher selection, evacuation routes, and de-energization steps for MV electrical fires. Water and foam agents are prohibited on energized MV equipment.