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Student & Learning Zone - City & Guilds
How Fast Should A Fuse Trip If Cannot Let Go?
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<blockquote data-quote="Technician" data-source="post: 316724" data-attributes="member: 15198"><p>There is no hard and fast rule that could be used to determine the</p><p></p><p>resistance of the human body. This means that it is almost if not</p><p></p><p>completely impossible to determine the current that would flow when</p><p></p><p>a human body is subjected to a given shock voltage, either under</p><p></p><p>conditions of direct or indirect contact.</p><p></p><p>I think Andy has hit it on the head; the body resistance IS too</p><p></p><p>high to permit such a current to flow that would cause a protective</p><p></p><p>device to operate.</p><p></p><p>30mA was chosen as the setting for additional protection because</p><p></p><p>it is less than the 50 mA threshold at which the more serious effects</p><p></p><p>of electric shock are experienced.</p><p></p><p>I recently had a check-up for Carpal Tunnel and this involved the</p><p></p><p>passage of electric currents up each arm. The display was clear.</p><p></p><p>Test currents were passed up each arm at 30mA. I felt no serious</p><p></p><p>or lasting ill effects but the path of the current was nowhere near</p><p></p><p>the old ticker.</p><p></p><p>I would be interested in what someone like Apache says about this</p><p></p><p>topic. He may confirm that livestock is FAR more susceptible to the</p><p></p><p>effects of electric shock than us humes.</p><p></p><p>Could Sidewinder post a link to that site if it is available?</p></blockquote><p></p>
[QUOTE="Technician, post: 316724, member: 15198"] There is no hard and fast rule that could be used to determine the resistance of the human body. This means that it is almost if not completely impossible to determine the current that would flow when a human body is subjected to a given shock voltage, either under conditions of direct or indirect contact. I think Andy has hit it on the head; the body resistance IS too high to permit such a current to flow that would cause a protective device to operate. 30mA was chosen as the setting for additional protection because it is less than the 50 mA threshold at which the more serious effects of electric shock are experienced. I recently had a check-up for Carpal Tunnel and this involved the passage of electric currents up each arm. The display was clear. Test currents were passed up each arm at 30mA. I felt no serious or lasting ill effects but the path of the current was nowhere near the old ticker. I would be interested in what someone like Apache says about this topic. He may confirm that livestock is FAR more susceptible to the effects of electric shock than us humes. Could Sidewinder post a link to that site if it is available? [/QUOTE]
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How Fast Should A Fuse Trip If Cannot Let Go?
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