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Wednesday, February 24, 2021
Question:
Good Morning,
What is the minimum HP rating for a single disconnect switch supplying two 1 HP motors rated at 230 V single phase? The motors may be started simultaneously. We are using the 2020 code.
Logan Wolosek
A
Answer:
Logan,
Thanks for the question. The minimum ampere rating of the switch must carry at least 18.4 amperes. The HP rating of the switch must be 3 HP minimum. Code Sections are 430.110(C )(1), 430. 110(C )(2), Table 430.248 and Table 430.251(A).