#Single line diagrams series

#Single line diagrams series

The symbol is a combination of a normally open contact (switch), overload relay, motor and disconnect device.Ī series of circle symbols representing meters usually mounted in a common enclosure. The symbol is a combination of a fuse and disconnect switch with the switch in the open position. The symbol is frequently shown in conjuction with a transfer switch. Protects a motor should an overload condition develop. Additional motor information is commonly printed next to symbol, such as horsepower, RPMand 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 closedposition 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 usuallymounted in assembled equipment. Represents current transformers mounted in assembled equipment. Represents a switch in low or medium/high voltage applications (open position shown)

Represents a fixed mounted low voltage circuit breaker. 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 one-lines 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. It is very versatile and comprehensive because it can depict a very complicated three-phase system. A single line can show all or part of a system. We usually depict the electrical distribution system by a graphic representation called a single line diagram (SLD).