Planning & EstimatingQuestion 390 of 521
A continuous load (operating 3 hours or more) draws 16 A. What minimum overcurrent-device/conductor rating must serve it?
a.16 A
b.18 A
c.20 A
d.25 A
Explanation
Continuous loads are multiplied by 125%: 16 A × 1.25 = 20 A. Sizing at the load itself (16 A) or by other factors does not satisfy the continuous-load rule, so 20 A is required.
Law Reference: 2023 NEC §210.20(A)Practice all 521 questions free — no signup required.
Related questions on this topic
- For a branch circuit, what maximum voltage drop does the NEC recommend for reasonable efficiency?
- A dwelling's total calculated load is 44,000 VA on a 240 V service. What is the smallest standard service rating that will carry this load?
- Electric-vehicle supply equipment is considered a continuous load. At what percentage of its rating must the branch circuit and feeder be sized?
- In a non-dwelling occupancy, 20 general-use receptacle outlets are installed. What load must be included for these receptacles?
- A mercantile (store) occupancy has 5,000 ft² of floor area and a general lighting unit load of 3 VA/ft². What is the general lighting load?
- A retail store has 10 linear feet of show-window lighting. Using the show-window unit load, what load must be included?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-10 Electrical Trade Examination · How we review