2. Electrical Safety

Therefore tasers and other stun guns can immobilize

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Unformatted text preview: power distribution – 60 Hz in North America and 50 Hz in Europe and many other parts of the world. For DC (zero frequency) and at 10 kHz, the threshold is ~5- fold higher. <Sidebar> The Let- Go threshold is the lowest at the 50 – 60 Hz frequencies, which are chosen for industrial and household power distribution. For DC (zero frequency) and at 10 kHz, the threshold is ~5- fold higher. The muscle paralysis is also dangerous for the following reason: if you see another person “frozen on the circuit” and touch his/her body trying to help, you can get “frozen on the circuit” yourself! The best course of action is to interrupt the current from the power source to the victim’s body. Sim analysis, we consider the worst- case scenario by substituting the lowest resistance values listed for the chosen conditions. In industry, any voltage above 30 V is considered as potentially dangerous. <Sidebar> In industry, any voltage above 30 V is considered as potentially dangerous. © 2013 Alexander Ganago Page 9 of 28 Last printed 2013- 07- 07 12:28 AM File: 2013 EEW 1- 02 Electrical safety.docx Engineering in the Electrical World (EEW) Part 1 Unit 2: Electrical safety Working conditions are extremely important: in a cool and dry lab room, a person may have dry skin with very high electric resistance; in a flooded basement or in an open field under hot sun, the same person will likely have wet skin whose electric resistance is much lower, which greatly increases the risk of a deadly electric shock. At home, remember about the potentially deadly combination of electricity and water. The data in Figure 2- 2 remind us that when our body gets wet, especially all wet immersed in a bathtub, many household sources of electricity may become deadly. Everyone has seen the tags warning not to use hair dryers in a bathtub; now you know that the danger is real! <Sidebar> Combination of electricity and water is potentially deadly. Never use any electric appliance when sitting in a bathtub! Another factor not listed in Figure 2- 2 involves jewelry, metallic rims of eyeglasses, and other conductive objects that may be in direct electric contact with the skin. Rings are in tight contact with relatively large areas of skin (around and between fingers) and are made of highly conductive metals. Rings,...
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