Motors & EquipmentCâu 100 / 120
A recessed luminaire that is NOT identified for insulation contact must maintain what minimum clearance from thermal insulation?
a.1 inch
b.1/2 inch
c.6 inches
d.3 inches
Giải thích
A non-IC recessed luminaire must be spaced at least 3 inches from thermal insulation so heat can dissipate, and insulation must not be installed above it in a way that traps heat. The 1/2-inch dimension is the required clearance from combustible materials other than the mounting surface, which is a different measurement.
Trích dẫn luật: 2023 NEC §410.116Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A hermetic refrigerant motor-compressor has a rated-load current of 20 amperes. What is the maximum branch-circuit short-circuit and ground-fault protective device at the standard 175 percent figure?
- For that same 20-ampere rated-load compressor supplied alone, what minimum conductor ampacity is required?
- A surface-mounted luminaire with a completely enclosed light source is installed in a clothes closet. What is the minimum clearance to the nearest point of the defined storage space?
- A generator nameplate current rating is 200 amperes. What minimum conductor ampacity is required from the generator terminals to the first overcurrent device?
- A photovoltaic source circuit uses modules with a rated short-circuit current of 10 amperes. What minimum conductor ampacity is required before any temperature or conduit-fill adjustments?
- A motor with a service factor of 1.16 will not start because the overload device trips, even though it is sized at 125 percent of nameplate current. To what maximum percentage may the overload device be increased?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với Journeyman Electrician Licensing Exam (NEC-based) · Quy trình kiểm tra