What symbol is used to denote low voltage in general electrical diagrams?

• A. Diamond with PL
• B. Diamond
• C. Circle
• D. Triangle

Answer: (B)

Low voltage is shown with a simple diamond shape because it provides a clear, unobtrusive tag that identifies the voltage level without implying a specific device or connection. The diamond stands out on diagrams and can be read quickly, which helps with safety and planning when handling circuits at lower voltages. A circle is typically used for other purposes (such as indicating a specific device or connection point), a triangle is often associated with other conventions (like delta configurations or warnings in some standards), and a diamond with letters (like PL) would point to a specific tag or device type rather than a general voltage indicator. So, the plain diamond is the standard symbol for low voltage.