Mạch nhánh & Đi dâyCâu 166 / 521
Bends in electrical metallic tubing (EMT) must be made so that which of the following is true?
a.At least six bends are used
b.The tubing is heated first
c.The tubing is not damaged and its internal diameter is not effectively reduced
d.The radius is as tight as possible
Giải thích
Section 358.24 requires EMT bends to be made so the tubing is not damaged and the internal diameter is not effectively reduced, using at least the radius shown in Chapter 9, Table 2. Kinking or flattening the tubing violates this. Heating EMT, forcing the tightest radius, or a fixed number of bends are not the standard.
Trích dẫn luật: 2023 NEC §358.24Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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