【Daily Topic】【Electrical Edition 20160823】
Thread Content
Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. When the artificial grounding electrode designed to protect against direct lightning strikes is located within 3 meters of the building’s entrances or pedestrian passages, what measures should be taken to reduce step voltage? ( ) A. The local burial depth of horizontal grounding electrodes should not be less than 0.8 m. B. The horizontal grounding electrodes should be covered with insulating material; an asphalt layer of 50–80 mm thickness can be used, and its width should exceed that of the grounding device by 2 m. C. An asphalt gravel surface can be used, or an asphalt layer of 50–80 mm thickness can be applied on top of the grounding electrodes, with its width also exceeding that of the grounding device by 2 m. D. The local burial depth of horizontal grounding electrodes should not be less than 0.5 m
B. The area around the horizontal grounding electrode should be insulated; an asphalt layer of 50–80 mm thickness can be used, and its width should exceed that of the grounding device by 2 m. C. An asphalt gravel surface can be used, or an asphalt layer of 50–80 mm thickness can be applied on top of the grounding electrode, with its width also exceeding that of the grounding device by 2 m
When the artificial grounding electrode designed to protect against direct lightning strikes is less than 3 m away from the building’s entrances or pedestrian passages, the measures that should be taken to reduce step voltage are (C). A. The local burial depth of horizontal grounding electrodes should not be less than 0.8 m. B. The horizontal grounding electrodes should be covered with insulating material; an asphalt layer of 50–80 mm thickness can be used, and its width should exceed that of the grounding device by 2 m. C. An asphalt gravel surface can be used, or an asphalt layer of 50–80 mm thickness can be applied on top of the grounding electrodes, with its width also exceeding that of the grounding device by 2 m. D. The local burial depth of horizontal grounding electrodes should not be less than 0.5 m
When the artificial grounding electrode designed to protect against direct lightning strikes is less than 3 m away from the building’s entrances, exits, or pedestrian passages, the measures that should be taken to reduce step voltage are (BC). A. The local burial depth of horizontal grounding electrodes should not be less than 0.8 m. B. The horizontal grounding electrodes should be covered with insulating material; an asphalt layer of 50–80 mm thickness can be used, and its width should exceed that of the grounding device by 2 m. C. An asphalt gravel surface can be used, or an asphalt layer of 50–80 mm thickness can be applied on top of the grounding electrodes, with its width also exceeding that of the grounding device by 2 m. D. The local burial depth of horizontal grounding electrodes should not be less than 0.5 m
When the artificial grounding electrode designed to protect against direct lightning strikes is less than 3 m away from the building’s entrances or pedestrian passages, the measures that should be taken to reduce step voltage are (ABC). A. The local burial depth of horizontal grounding electrodes should not be less than 0.8 m. B. The areas where horizontal grounding electrodes are located should be covered with insulating material; an asphalt layer 50–80 mm thick can be used, and its width should exceed that of the grounding device by 2 m. C. An asphalt-gravel surface can be used, or an asphalt layer 50–80 mm thick can be applied on top of the grounding electrodes, with its width also exceeding that of the grounding device by 2 m. D. The local burial depth of horizontal grounding electrodes should not be less than 0.5 m
When the artificial grounding electrode designed to protect against direct lightning strikes is less than 3 m away from the building’s entrances or pedestrian passages, the measures that should be taken to reduce step voltage are (ab ).
A. The local burial depth of horizontal grounding electrodes should not be less than 0.8 m. B. The horizontal grounding electrodes should be covered with insulating material; an asphalt layer with a thickness of 50–80 mm can be used, and its width should exceed that of the grounding device by 2 m