Thiết bị & Hệ thốngCâu 348 / 521
How must exposed non-current-carrying metal parts of PV module frames and equipment be treated?
a.Frames need no bonding
b.Bond only the inverter
c.Exposed non-current-carrying metal parts of PV module frames and equipment shall be bonded and grounded
d.Use only bare copper laid loosely on the roof
Giải thích
Section 690.43 requires exposed non-current-carrying metal parts of module frames, racking, and equipment to be bonded together and connected to an equipment grounding conductor, using listed devices or means. Bonding only the inverter or leaving frames unbonded would leave metal surfaces energized during a fault.
Trích dẫn luật: 2023 NEC §690.43Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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