Lập kế hoạch & Dự toánCâu 415 / 521
What is the line current of a 30 kVA, three-phase load supplied at 208 V?
a.144 A
b.100 A
c.72 A
d.83 A
Giải thích
For a three-phase load, I = VA ÷ (V × 1.732) = 30,000 ÷ (208 × 1.732) = 30,000 ÷ 360 = 83 A. Dividing by 208 alone or by 120 gives the incorrect single-phase-style results.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- The 2023 NEC requires one- and two-family dwellings to have an emergency disconnect installed where?
- For 120/240 V equipment likely to require examination while energized (Condition 1), what is the minimum depth of working space in front of it?
- What is the minimum width of working space in front of electrical equipment (or the width of the equipment, whichever is greater)?
- What is the minimum headroom (height) of working space about electrical equipment such as panelboards?
- A complete bid price for an electrical project generally consists of which of the following?
- The NEC is updated on a three-year cycle. The 2023 NEC directly follows which prior edition?
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