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Common electrical terms can be more easily understood by comparing them to players on a soccer field.
We all understand that electricity can kill us, but why does a higher voltage mean more danger? In fact, why does voltage matter at all? After all, it’s the amperage that causes the electrical injury.
Voltage is the force that moves the amperage. Think of amperage as a soccer ball (fútbol) and voltage as the kicker. If the kicker does not kick the ball, then the ball doesn’t move. The harder the ball is kicked, the further it will travel across the field.
This is the same with electricity: If there is no voltage on the wire then the amperage doesn’t move. An increase in voltage causes the amperage to travel further through wires, other conductive objects, and the air. This is why a minimum approach distance (MAD) from a 21-kilovolt (kV) primary is further than the MAD from a 240-volt secondary.
The pressure (voltage) in the primary wire is high enough that it could jump (arc) through the air to your body. However, in the secondary wires, there is not enough pressure to cause the amperage to leave the wire and enter your body (unless you touch the wire, of course).To prevent the amperage from entering our bodies, we must stay further away from wires with higher voltage.
So why doesn’t the electricity travel through things like insulated pole tools and insulators on the pole? This has to do with ohms. Ohms are a measure of resistance. Resistance is like a goalkeeper in soccer. When the soccer ball is kicked really hard toward the goal, a strong goalkeeper will keep the ball from entering the goal.
Insulators on a pole and insulated pole tools have very strong resistance (high ohms) therefore, the electricity (amperage) cannot pass through the insulator and into the pole or through the insulated pole tool and into the worker. To prevent electricity from entering your body, be sure to maintain the appropriate distance and use insulated pole tools when cutting branches that are in contact with wires.
Additional items to consider:
Remember, it only takes 1/10 of an amp to put your heart into ventricular fibrillation (V-Fib). This occurs when your heart beats at an abnormal rhythm and prevents proper blood flow, which can lead to a heart attack and death.
ACRT Arborist Training provides entry-level through advanced arborist classes and certifications for line clearance companies, government agencies, tree care companies, municipalities, and individuals around the nation.
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