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Alexander C. Frank, ETH Zürich 03.07.2010

Alexander C. Frank, ETH Zürich 03.07.2010. Georg Simon Ohm: “ Ohm‘s Law “, 1881. Why is High Voltage dangerous ?. (No electronic accidents reported before that date  ). Human Body : R = 1 k W d epends on body , clothing , shoes , …. I = U / R. I ~ 9 mA . I < 20 mA

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Alexander C. Frank, ETH Zürich 03.07.2010

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  1. Alexander C. Frank, ETH Zürich 03.07.2010

  2. Georg Simon Ohm: “Ohm‘sLaw“, 1881 Whyis High Voltagedangerous ? (No electronicaccidentsreportedbeforethat date  ) • Human Body : R = 1 kW • depends on body, clothing, shoes, …

  3. I = U / R • I ~ 9 mA • I < 20 mA • (by Design)

  4. Body – ElectronInteractions (Heartbeat out of lock ) • 0.05 mA prickle (kribbeln) • 1 - 15 mA heavy prickle, start of cramp • 15 - 20 mA cannotreleaseconductor • 20 - 50 mA heavycramp, 3 – 4 Min. to death • > 50 mA cardiacfibrillation, seconds to death • whenapplying DC Voltage an electrolysis of thebloodis to beadded.

  5. PRECAUTIONS bycommand of theexecutiveboard ! • NEVER everworkalonewith High Voltage (> 50 V) • UseFI-Switch (Residual CurrentProtectiveDevice) • OR • Use Isolation • Transformer

  6. NEVER workalonewith High Voltage (> 50 V) • Thereisnobodywhocan • switch off thecurrent • performfirstaid • call a doctor (MD!!!) • readtheEmergency Checklist 

  7. Howdoes an FI-Switchwork ?

  8. Howdoes an Isolation Transformerwork ?

  9. AnyQuestions ??? • estanochebuenasuerte !

  10. NumericExample :

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