The letter inside circle indicates the color. Additional motor information is commonly printed next to symbol, such as horsepower, RPM and voltage.Ĭan represent a single contact or single pole switch in the open position for motor controlĬan represent a single contact or single pole switch in the closed position for motor control Represents a motor and is also shown with an “M” inside the circle. Represents a battery in an equipment package Represents potential transformers usually mounted in assembled equipment. Represents current transformers mounted in assembled equipment. Represents low and medium/high voltage bus duct. Represents a switch in low or medium/high voltage applications (open position shown) Represents a drawout low voltage circuit breaker. Represents a fixed mounted low voltage circuit breaker. Represents a structure equipped to accept circuit breaker in the future, commonly known as provisions. Normally represents a MV drawout circuit breaker 5kV and above.įuture removable or drawout circuit breaker position Additional information is normally printed next to symbol indicating winding connections, primary /secondary voltages and KVA or MVA ratings. Represents a variety of transformers from liquid filled to dry types. This chart shows the most frequently used symbols. To interpret SLDs you first need to be familiar with the electrical symbols. We use universally accepted electrical symbols to represent the different electrical components and their relationship within a circuit or system. Learn To Interpret Single Line Diagram - SLD (on photo: An example of 66/6.6kV power substation single line diagram)
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