Wiring Methods & MaterialsCâu 69 / 120
How must electrical metallic tubing be secured and supported on a normal horizontal run?
a.Secured within 3 feet of each box and supported at least every 10 feet
b.Secured within 12 inches of each box and supported every 4 and 1/2 feet
c.Secured within 3 feet of each box and supported every 6 feet
d.Support is required only every 10 feet with no requirement near boxes
Giải thích
EMT must be securely fastened within 3 feet of every box, cabinet or termination and supported at intervals not exceeding 10 feet. The 12-inch and 4 and 1/2-foot figures belong to Type NM and Type AC cable, and the 6-foot interval is the MC cable support spacing.
Trích dẫn luật: 2023 NEC §358.30(A)Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the minimum burial cover for rigid metal conduit installed underground in a location not otherwise specified?
- What is the minimum burial cover for a nonmetallic raceway listed for direct burial without concrete encasement, installed under a lawn?
- A GFCI-protected 120-volt, 20-ampere residential branch circuit is direct buried in a yard. What is the minimum cover?
- How must Type NM cable be supported where it enters a box equipped with cable clamps?
- At what maximum interval must Type MC cable be supported and secured?
- At what maximum interval must Type AC cable be supported?
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