There are three types of lighting schematic diagrams: single-line, analytical and operational. To draw a single-line schematic, include only the important elements of the lighting circuit. In an analytical schematic, show all lines connecting various parts of the circuit. When drawing an operating schematic, detail the paths of electrical current.Continue Reading
Remember that each line containing a lighting circuit includes three conductors, which must be shown in the colors specified in regulations: brown or black for phase conductors, light blue for neutral conductors and yellow/green for ground conductors. A dashed yellow/green line indicates the ground that connects to the lamp from the common ground, represented by a continuing yellow/green line. The dashed line represents a secondary connection.
Some basic symbols are used in all types of lighting schematics: a straight line, indicating the electrical wire through which current is conducted; a circle filled with an x, indicating a lamp; two connected lines with a dark circle at the point of connection signifying connected wires; and a rectangle imposed over a straight line, indicating a fuse circuit. A fuse circuit disconnects to protect a circuit from current overload. Switches are indicated by a short line off a small circle. When the line is unattached, the circuit is not connected. In lighting schematics, circuits are commonly shown in a switched-off mode.Learn more about Electrical