In which section of the NEC can recommended maximum voltage drops be found?

• A. NEC Section 300.12
• B. NEC Section 210.19(A)(1)
• C. NEC Section 400.10
• D. NEC Section 500.5

Answer: (B)

The recommended maximum voltage drops can be found in NEC Section 210.19(A)(1). This section addresses branch circuits and includes guidance on maintaining acceptable voltage levels to ensure efficient operation of electrical systems. Specifically, it outlines the maximum allowable voltage drop for circuits that serve lighting and receptacle outlets in residential and commercial buildings, emphasizing that excess voltage drop can lead to inadequate operation of appliances and lighting.

In contrast, the other sections listed do not pertain specifically to voltage drop calculations. Section 300.12 deals with the requirements for conductor sizing to ensure safe and effective operation, but does not provide specific guidance on maximum voltage drops. Section 400.10 covers flexible cords and cables, focusing on their proper use and installation rather than electrical performance factors such as voltage drop. Section 500.5 addresses hazardous locations and the requirements for installation in such areas, which is unrelated to voltage drop recommendations. Therefore, NEC Section 210.19(A)(1) is the authoritative source for understanding recommended maximum voltage drops in branch circuits.