Mạch nhánh & Đi dâyCâu 170 / 521
Liquidtight flexible metal conduit (LFMC) is especially suited for which of the following uses?
a.As a general lighting raceway in dry ceilings only
b.Only for service-entrance conductors
c.Connections to equipment where flexibility and protection from liquids are needed
d.Only for direct burial without fittings
Giải thích
Section 350.10 permits LFMC where flexibility or protection from liquids, vapors, or solids is required, such as connections to motors and outdoor equipment. It is not limited to dry ceilings, is not intended specifically for service-entrance conductors, and requires listed fittings rather than bare direct burial.
Trích dẫn luật: 2023 NEC §350.10Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Direct-buried conductors or cables emerging from grade must be protected by enclosures or raceways from the required cover depth up to what height above finished grade?
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- Electrical metallic tubing (EMT) is generally not permitted to be used in which condition?
- Rigid metal conduit (RMC) is permitted to be used under which of the following conditions?
- Cables or raceways installed under metal-corrugated sheet roof decking must be kept at least what distance from the lowest surface of the roof decking to the top of the raceway or cable?
- What is the minimum working-space depth for electrical equipment operating at 151 to 600 volts to ground under Condition 2 (exposed live parts on one side and grounded parts on the other)?
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