Dịch vụ & Phân phốiCâu 114 / 521
In a standard dwelling load calculation, the general lighting and receptacle load demand factor applies 100% to:
a.The first 3000 VA
b.The first 10,000 VA
c.All VA above 120,000
d.None of the load
Giải thích
Per Table 220.42, the first 3000 VA of general lighting/receptacle load is taken at 100%, the portion from 3001 to 120,000 VA at 35%, and any remainder at 25%. The other choices misstate the thresholds of the demand-factor table.
Trích dẫn luật: 2023 NEC §220.42Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A detached garage is supplied by a feeder from the main dwelling. At the garage, the code generally requires:
- On a 4-wire delta system where the midpoint of one phase is grounded, the conductor with the higher voltage to ground (the high leg) must be durably and permanently marked, typically colored:
- A service raceway enters a building from an underground distribution system. To prevent moisture and gases from entering, the raceway must be:
- Where multiple service disconnects are installed under the 2023 NEC, the general requirement (compared to older editions) is that they be:
- When installing a surge-protective device (SPD), the best practice for the connecting conductors is to:
- A series-rated combination of overcurrent devices is permitted to protect equipment where the available fault current exceeds the interrupting rating of a downstream device, provided the combination is:
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra