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Industrial / Electrical Maintenance Technician

4-6 months training· 8 lessons
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Electrical Safety Fundamentals

12 min read

Learning objective

By the end of this lesson you can identify common electrical hazards and apply fundamental safety rules to prevent accidents in industrial settings.

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Electrical Safety Fundamentals

Welcome. In this lesson we will cover electrical safety fundamentals. It takes about 12 min.

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Working with electricity is dangerous. One mistake can cause death, fire, or permanent injury. The rules are simple and must never be broken: (1) Always turn off power at the main breaker before working on any circuit. (2) Verify with a multimeter that the power is truly off — never trust a switch alone. (3) Wear insulated gloves and rubber-soled shoes. (4) Never work on electrical systems in wet conditions or with wet hands. (5) Use insulated tools with safety markings.

In industrial settings (factories, mines, construction sites), voltages are higher and dangers are greater. A 240V household shock is painful; a 11,000V industrial shock is lethal. Lockout/tagout procedures ensure that when you turn off power to work on a machine, no one else can turn it back on until you finish. This procedure — locking the breaker with your personal padlock — has saved countless lives.

Diagrams for this lesson

Download them to study on paper, away from the phone.

Multimeter — where the probes go 12.6 V V⎓ V∼ A Ω COM VΩmA Battery 12 V + − Black to COM and to negative. Red to VΩmA and to positive. 12.6 V ≈ 100% · 12.2 V ≈ 50% Safety note: never select Amps across a battery — it shorts the meter. Voltage is measured across a component. Current is measured in the line. Continuity is only tested with the power off. Miva Skills Navigator — study sheet
Multimeter — where the probes go

Voltage is measured across a component. Current is measured in the line. Continuity is only tested with the power off.

Series and parallel — what happens to volts and amps In series 12 V 5 A 12 V 5 A = 24 V · 5 A In parallel 12 V 5 A 12 V 5 A = 12 V · 10 A Rule: the controller sets the limit. Never exceed its input volts or amps. Volts (V) · Amps (A) · Positive (+) · Negative (−) Series adds voltage and keeps current. Parallel adds current and keeps voltage. Two 12 V / 5 A panels give 24 V / 5 A or 12 V / 10 A. Miva Skills Navigator — study sheet
Series and parallel — what happens to volts and amps

Series adds voltage and keeps current. Parallel adds current and keeps voltage. Two 12 V / 5 A panels give 24 V / 5 A or 12 V / 10 A.

Practice question

  1. What should you do AFTER turning off the main breaker before working on a circuit?