Electricity Remains a Serious Workplace Hazard
Excerpt Courtesy of OH&S Publication
By Laura Proctor, Srin Kuchibotla
The body's reaction to electric shock can range from a minor tingling sensation to instant death. Even at levels as low as 3 milliamperes, current traveling through the body can cause indirect or secondary injuries, including bruising and bone fractures. A milliampere (mA) is a measurement of current, with 1,000 milliamperes per amp. For example, 120 volts/1000 Ώ is equal to .120 AMP, which is equal to 120 mA.
Consider how the body reacts when it comes into contact with the following levels of electricity:
0.5-3 mA
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Tingling sensation
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3-10 mA
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Muscle contractions and pain
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10-40 mA
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"Let-go" threshold
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30-75 mA
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Respiratory paralysis
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100-200 mA
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Ventricular fibrillation
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200-500 mA
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Heart clamps tight
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1500+ mA
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Tissue and organs start to burn
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To put these levels of exposure into perspective, the voltage levels for equipment and power sources present in many industrial facilities follow:
120V
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Standard office wall voltage
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240V
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Heater circuits, small machinery, drill presses
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277V
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High-intensity overhead lighting circuits
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480V
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Heavy-duty machinery
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600V
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Mining machinery
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13000-15000V
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Incoming feed from the power company
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