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Which standard specifies that metal mesh of 10*10 mm should be installed in the window openings of distribution rooms?
Code for Design of Low-Voltage Power Distribution Systems (GB 50054-2011) 4.3.7 The doors and windows of the power distribution room shall close tightly； Holes and ventilation openings that lead to the outside should be fitted with mesh covers to prevent small animals such as rats and snakes from entering, and their protection level should not be lower than IP3X as specified in the current standard \"Protection Degree of Enclosures (IP Code)\", GB 4208. Ventilation openings that are in direct contact with the outdoor area should also be equipped with measures to prevent rain and snow from entering.
4.3.7 It also does not state that a metal mesh must be added outside the window; it only emphasizes that the closure should be airtight.