【Daily Question 14】June 14, 2018
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Electrical circuits in explosive gas environments should be installed in areas where the risk of explosion is lower or at a greater distance from the source of ignition. When flammable substances are heavier than air, electrical circuits should be installed in （ ）； Cable trays are advisable for overhead installation ； When laying in cable trenches, the trenches should be filled with sand, and drainage facilities are advisable. A. Installation on the interior walls of buildings B. Installation at lower levels C. Installation in cable trenches D. Installation at higher levels or directly buried. D: For management purposes, if you need to access content from a few days ago, please use the summary post below to do so. https://bbs.hcbbs.com/home.php?m ... w=me&from=space
D. Installed at a higher position or directly buried
D. Installed at a higher position or directly buried
D. Installed at a higher position or directly buried