Dịch vụ & Phân phốiCâu 42 / 521
The optional feeder/service calculation of 220.84 for a multifamily dwelling may be used only when which condition is met?
a.There are at least 3 units and no dwelling is supplied by more than one feeder
b.The building is over 3 stories
c.Each unit exceeds 2,000 sq ft
d.Only one meter serves the building
Giải thích
Per 220.84, the optional multifamily method applies when there are 3 or more dwelling units, no unit is supplied by more than one feeder, and each unit has electric cooking plus electric heat or AC. Story count, unit size, and meter count are not the qualifying conditions.
Trích dẫn luật: 2023 NEC §220.84Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Under the optional dwelling calculation, how are the general loads (other than heating/AC) treated?
- A dwelling's general lighting plus small-appliance/laundry load totals 13,500 VA. Using the standard demand factors (first 3,000 VA at 100%, remainder at 35%), what is the demand?
- What is the minimum service disconnecting means rating for a one-family dwelling?
- A dwelling has 10 kW of electric heat and a 5 kW air conditioner that never run at the same time. What load is included in the calculation?
- Service-entrance conductors must supply a computed load of 160 A continuous. What minimum conductor ampacity is required per 230.42?
- What is the full-load secondary current of a 45 kVA, 3-phase, 208 V transformer?
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