Gas PipingCâu 92 / 120
A corrugated stainless steel tubing (CSST) gas system is installed in a two-story house. What is the minimum size of the copper bonding jumper used to bond the CSST system to the electrical service grounding electrode system?
a.14 AWG
b.12 AWG
c.6 AWG
d.10 AWG
Giải thích
CSST that is not listed as arc-resistant jacketed must be directly bonded with a jumper no smaller than 6 AWG copper, connected to a rigid metallic component of the gas piping upstream of the first CSST fitting. Smaller conductors such as 14, 12 or 10 AWG cannot reliably carry lightning-induced energy and would not satisfy the bonding requirement.
Trích dẫn luật: IFGC §310Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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