Electrical Safety Basics Every Technician Must Know

Every year, electrical accidents kill thousands of workers worldwide — not because electricity is unpredictable, but because safe procedures were skipped, PPE was not worn, or someone assumed the circuit was dead without verifying it. The tragedy is that virtually every electrical fatality is preventable. The knowledge exists. The procedures exist. The equipment exists. What is missing, in most cases, is disciplined application of what every technician should already know.

Whether you are an electrical technician, an automation engineer, a maintenance professional, or a student preparing to work on industrial equipment — this article covers the non-negotiable fundamentals of electrical safety that will protect you, your colleagues, and your career.

"Electricity does not forgive a second mistake. Every safety rule in this field was written because someone died the first time it was ignored."

1. Understanding Electrical Hazards — What Can Actually Kill You

To work safely around electricity, you must first understand exactly what makes it dangerous. There are four primary electrical hazards, and each requires a different response.

2. Lockout/Tagout (LOTO) — The Most Important Safety Procedure

Lockout/Tagout (LOTO) is the procedure used to ensure that a machine or circuit is completely de-energised — and stays de-energised — before any maintenance or repair work begins. LOTO prevents the accidental re-energisation of equipment while someone is working on it. It is the single procedure that prevents the majority of electrical fatalities in industrial environments.

LOTO is not optional. It is mandated by IEC 60364, OSHA 29 CFR 1910.147, BS EN ISO 14118, and the safety regulations of every country with workplace safety legislation. Bypassing LOTO is grounds for immediate dismissal in any professionally-run organisation — and criminal prosecution if someone is injured as a result.

The 6-Step LOTO Procedure

3. Arc Flash — The Invisible Killer

Arc flash is the most underestimated electrical hazard in industry. Many experienced technicians have never received formal arc flash training, yet work daily on equipment capable of producing a catastrophic arc flash event. Understanding the basics is not optional for anyone working on energised electrical equipment.

What Causes an Arc Flash?

• Accidental contact between conductors with a conductive tool or body part
• Insulation breakdown caused by contamination (dust, moisture, vermin)
• Overvoltage events (lightning, switching surges)
• Incorrect insertion of test equipment while equipment is energised
• Tracking across contaminated busbar surfaces

Arc Flash Protection — The Hierarchy of Controls

Control Level	Method	Effectiveness
1. Elimination	De-energise before working. LOTO applied. No live work.	100% — removes the hazard entirely. Always the first choice.
2. Substitution	Replace high-incident-energy equipment with arc-resistant switchgear (arc-proof panels)	Reduces severity if arc still occurs
3. Engineering controls	Zone-selective interlocking, bus differential protection, reducing fault clearing time	Reduces incident energy by faster fault clearance
4. Administrative controls	Establish an Energised Electrical Work Permit (EEWP) system. Only permit live work when absolutely necessary with documented justification.	Reduces frequency of exposure
5. PPE	Arc-rated FR clothing, face shield, insulating gloves. The LAST line of defence, not the first.	Reduces injury severity — does NOT prevent the arc

4. Personal Protective Equipment (PPE) for Electrical Work

When de-energisation is not possible and justified live work must proceed, the correct PPE must be selected based on an arc flash risk assessment that calculates the incident energy in cal/cm² at the working distance. The PPE arc rating must exceed the calculated incident energy.

5. Safe Working Practices — The Daily Habits That Keep You Alive

Beyond LOTO and PPE, there are fundamental day-to-day practices that distinguish a safe technician from one who will eventually have a serious incident.

Use the Right Tools — Always

• Use insulated tools only — every screwdriver, pliers, spanner, and probe that goes near live conductors must be rated for the voltage class. VDE-rated (1000V AC / 1500V DC) tools are the minimum standard for LV electrical work.
• Use a calibrated voltage tester — not a cheap multimeter with frayed test leads. Use a CAT III or CAT IV rated tester appropriate for the installation. Replace test leads that show any signs of damage.
• Use one hand where possible — when testing live equipment that cannot be de-energised, keep one hand behind your back or in your pocket. This reduces the risk of a hand-to-hand current path through your heart.

Work Area Safety

• Never work alone on energised equipment — always have a second person present who can call for emergency services and begin CPR if needed. They must not touch the casualty until the power is confirmed off.
• Clear the work area — remove all conductive objects, tools, jewellery, and debris from the work area. Rings, watches, and metal-framed glasses have caused electrical burns and fatalities.
• Barricade the work zone — use warning tape and barriers to prevent unauthorised personnel from entering the electrical work area. Post warning signs: "ELECTRICAL WORK IN PROGRESS — KEEP OUT."
• Maintain a clean, dry workspace — water and electricity are a lethal combination. Dry all surfaces before beginning electrical work. If the environment is wet, do not proceed without additional precautions.

Permits and Documentation

• Use Permit-to-Work (PTW) for all energised work — a PTW is a written record that documents the isolation, the workers authorised, the scope of work, and the safety measures applied.
• Never work beyond your competency — if you are not qualified or trained for a task, stop and get the right person. Overconfidence is a primary cause of electrical accidents.

6. Emergency Response — What to Do If Someone Is Electrocuted

Knowing how to respond correctly in the first 30 seconds can mean the difference between life and death for a colleague.

Step	Action	Critical Detail
1. Do NOT touch	Do NOT touch the casualty if they are still in contact with live electricity	You will become a second casualty. Isolate the power first.
2. Isolate power	Switch off the supply at the nearest isolator, breaker, or emergency stop	If you cannot isolate, use a dry non-conductive object to push the casualty away from the source
3. Call emergency services	Call emergency services (police/ambulance) immediately — before starting CPR if you cannot do both simultaneously	Give your exact location, the nature of the incident, and the number of casualties
4. Begin CPR	If the casualty is unresponsive and not breathing normally, begin CPR immediately (30 chest compressions : 2 rescue breaths)	Electrical shock causes cardiac arrest and respiratory arrest. CPR must begin within 4 minutes for best outcome
5. Use AED if available	Attach an Automated External Defibrillator (AED) as soon as one is available and follow its instructions	AEDs are required by law in many countries in all workplaces above a certain size
6. Treat for shock and burns	Even if the casualty is conscious, treat for shock. Cover entry/exit burn wounds lightly with a clean dressing.	Electrical burns are often deeper than they appear. ALL electrical shock casualties must be assessed by a medical professional, even if they "feel fine."

7. Key Electrical Safety Regulations

Standard	Region	What It Covers
IEC 60364	International	Complete electrical installation safety — design, protection, wiring, inspection, and testing. The foundation of all national electrical safety codes.
NFPA 70E	USA	Standard for Electrical Safety in the Workplace. Arc flash assessment, PPE selection, LOTO, energised electrical work permit. The most detailed arc flash standard in the world.
BS 7671 (IET Wiring Regulations)	UK	National adoption of IEC 60364 with UK amendments. Applies across UK and many former Commonwealth nations. Currently 18th Edition (2018 + Amendment 2, 2022).
OSHA 1910.269 / 1926.950	USA	Electric power generation, transmission, and distribution safety. Mandates LOTO, PPE, and approach distances for all high-voltage work.
IEC 60900	International	Live working — minimum requirements for insulating hand tools. Specifies voltage ratings and testing intervals for electrical insulating tools.
IEC 60903	International	Specification for insulating rubber gloves used in electrical work. Defines voltage classes (00, 0, 1, 2, 3, 4) and mandatory 6-monthly testing intervals.

8. The Most Common Electrical Safety Mistakes

• Assuming the circuit is dead — the most common fatal mistake. Always verify with a tester. Always.
• Using PPE as a substitute for isolation — gloves and face shields reduce injury; they do not make working on live equipment safe.
• Skipping LOTO for "just a quick job" — the majority of electrical fatalities happen during brief, routine maintenance tasks where LOTO was skipped because the job "only takes two minutes."
• Not checking for multiple supply sources — equipment fed from two separate panels, UPS systems, capacitor banks, and standby generators have all killed technicians who isolated only one source.
• Using unrated tools — a standard screwdriver used to probe a live terminal has no insulation at the tip. One slip and the tool becomes a conductor.
• Ignoring near-misses — near-miss events (a small arc, an unexpected shock, a sparking tool) are warnings. Every near-miss must be reported and investigated as if it were a serious accident, because next time it may be.