In this article, I will explain to you how motor overload relay is sized according to National Electrical Code (NEC). I will be sharing with you what I have learned from college and review center when I took registered master electrician. What is an Overload Relay? Overload Relay is normally used for motor control as a protective device against overloading. It can be an electronic type or the conventional type that uses a bimetallic strip that will react to the amount of line current passing. It's wired in series with the power circuit for current sensing and has usually two contacts for signalling and command. Why do we need to properly size an Overload Relay? Overload relay must be properly sized
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