abgreifbare Spannung
English translation: touch potential
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| 10:02 Jan 15, 2004 |
| German to English translations [PRO] Tech/Engineering / Railways | |||||||
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|  Selected response from: John Jory Germany Local time: 22:40 | ||||||
Grading comment
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| Summary of answers provided | ||||
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| 4 +1 | measurable current |
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| 5 | touch potential |
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| 5 | stray voltages |
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| 2 | pickup current? |
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Answers
51 mins confidence: 
pickup current? Explanation: Duden Oxford: ab|greifen unr. tr. V. a) measure (with one's hand); eine Strecke mit dem Zirkel abgreifen: measure a distance with compasses; s. auch abgegriffen 2; b) (Elektrot.) pick up Might help |
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2 hrs confidence: peer agreement (net): +1
peer agreement (net): +1measurable current Explanation: High transient voltages may be induced in the rails of electrified lines when a DC traction motor passes. This current may be shorted out by the human body, if the human body happens to be standing on one of the rails and bridging across to earth. Unlikely, but not impossible, and may be the reason for railway lines to be bonded to earth at regular intervals. -------------------------------------------------- Note added at 3 hrs 3 mins (2004-01-15 13:06:44 GMT) -------------------------------------------------- \"Potentially-hazardous/dangerous induced currents which can be shorted out by the human body may be generated....\" |
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3 hrs confidence:
touch potential Explanation: "Touch potential" is the voltage between the energized object and the feet of a person in contact with the object. (ref 1) "A consequence of having good rail insulation contributes to higher rail voltages on the system, which may introduce hazardous touch potentials to personnel and passengers at stations (for example, a passenger touching a vehicle body whilst a train is at the station)." (ref 2) Reference: http://www.osha-slc.gov/pls/oshaweb/owadisp.show_document?p_... Reference: http://www.pbworld.com/news_events/publications/network/issu... |
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Grading comment
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5 hrs confidence:
stray voltages Explanation: Along transmission lines there are several different hazards: 1. Cracked insulators on high voltage towers render the tower hot, whereby you have voltage differentials across the ground, painful to cattle, as the voltage seeks a return path. 2. Electro magnetic radiation along high tensionlines 3. Electro magnetic induction from high tension lines 4. Negative Return. A wire attached to the rail (or ground) that is used to return spent DC voltage (current) to the power source. The vast majority of systems attach the negative return to the rail. When ground is used as the negative return on DC systems, stray voltage may cause corrosive damage to utility connections (water, gas, etc.) of buildings near the ROW. Look also in Google for court cases relatind to alledged damage due to such stray voltages. Many of the problems affect cattle and horses more than people, because of the greater distance between their legs, they can pick up larger voltages from the ground. -------------------------------------------------- Note added at 2004-01-15 16:00:13 (GMT) -------------------------------------------------- ROW (Right Of Way) The area between and directly adjacent to the tracks. Also refers to dedicated off-street tracks for light rail vehicles. Light Rail systems have the ability to control work performed in or adjacent to the ROW. Reference: http://www.lightrail.com/terminology.htm |
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