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    Home » Amperage, Not Voltage, Poses the Greatest Danger With Electrical Shock

    Amperage, Not Voltage, Poses the Greatest Danger With Electrical Shock

    November 26, 2021No Comments Skills & Specialties
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    There are many dangers associated with electricity. An accidental shock can cause severe burns, damage to internal organs, and even death. Interestingly, while most people think of electricity in terms of voltage, the most dangerous aspect of electrical shock is the amperage, not the voltage.

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    Voltage vs. Amperage

    Voltage and amperage are two measures of electrical current or flow of electrons. Voltage is a measure of the pressure that allows electrons to flow, while amperage is a measure of the volume of electrons. An electrical current at 1,000 volts is no more deadly than a current at 100 volts, but tiny changes in amperage can mean the difference between life and death when a person receives an electrical shock. 

    Although the physics are complicated, some experts use an analogy of a flowing river to explain the principles of electricity. In this analogy, voltage is equated with the steepness, or pitch, of the river, while amperage is equated with the volume of water in the river. An electrical current with high voltage but very low amperage can be seen as a very narrow, small river flowing nearly vertical, like a tiny trickle of a waterfall. It would have little potential to really hurt you. But a large river with lots of water (amperage) can drown you even if the speed of flow (voltage) is relatively slow. 

    Of the two, amperage is what creates the greatest risk.

    Effects of Amperage on Electrical Shock

    Different amounts of amperage affect the human body in different ways. The following list explains some of the most common effects of electrical shock at various amperage levels, according to the U.S. Occupational Safety and Health Administration (OSHA). To understand the amounts involved, a milliampere (mA) is one-thousandth of an ampere (or amp). A standard household circuit that supplies your outlets and switches carries 15 or 20 amps (15,000 or 20,000 mA). 

    • 1 to 5 mA: Little electrical shock is felt. Upsetting, but not painful.
    • 6 to 30 mA: Painful shock, loss of muscle control.
    • 50 to 150 mA: Extreme pain, possible severe muscle reactions, possible respiratory arrest, and even possible death.
    • 1,000 mA to 4,300 mA: Heart ceases pumping; nerve damage and death likely.
    • 10,000 mA (10 amps): Cardiac arrest, severe burns, and death.

    This gives you an idea of just how much danger there is in the home wiring system we take for granted, where wires carry 15,000 or 20,000 mA.

    Staying Safe

    The best way to prevent electrical shock is to follow standard safety procedures for all electrical work. Here are some of the most important basic safety rules:

    • Shut off the power: Always turn off the power to a circuit or device that you will be working on. The most reliable way to shut off the power is to switch off the breaker for the circuit in the home’s service panel (breaker box).
    • Test for power: After turning off a circuit’s breaker, check the wiring or devices you will be working on with a non-contact voltage tester to confirm the power is off. This is the only way to be sure you turned off the correct circuit.
    • Use insulated ladders: Never use an aluminum ladder for electrical work. Always use an insulated fiberglass ladder to keep you safe.
    • Stay dry: Avoid wet areas when working around electricity. If you are outdoors in damp or wet conditions, wear rubber boots and gloves to reduce the chance of getting shocked. Plug power tools and appliances into a GFCI (ground-fault circuit interrupter) outlet or GFCI extension cord. Dry your hands before grabbing any cord.
    • Post warnings: If you are working on the service panel or a circuit, place a warning label on the face of the panel to warn others not to turn on any circuits. Before turning the power back on, make sure no one else is in contact with the circuit.

    Source: The Spruce

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