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English Translations » 电气工程圈 » 【Electrical Version】Daily Question 20180325

【Electrical Version】Daily Question 20180325

2018-03-25View Original

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When the down conductors of building lightning protection systems are installed concealed, their diameter must not be less than ( ). (A) Φ6mm (B) Φ8mm (C) Φ10mm (D) Φ12mm Answer: D
Reply #22018-03-25
When the down conductors of building lightning protection systems are installed concealed, their diameter must not be less than (D) Φ12mm.

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Translated at 2026-07-23 01:36:52

Original: https://bbs.hcbbs.com/thread-1948701-1-1.html

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