Which symbol should be used for a switch in electrical plans?

The correct symbol for a switch in electrical plans is a circle with a line. This representation is part of standard electrical drafting conventions. The circular shape suggests the rotary or toggled action associated with many types of switches, while the line indicates the connection point of the switch, illustrating how it interacts with the electrical circuit.

In electrical schematics and blueprints, symbols are crucial for clearly communicating the design and intended functions of the electrical components. The symbol for a switch is universally recognized and helps electricians and engineers quickly identify the component's role within the system during installation, maintenance, or inspections.

The other options, such as the zigzag line, rectangle, and triangle, represent different electrical components or functions that do not correspond to a standard switch symbol. This specificity is essential in ensuring clear communication and avoiding confusion during the electrical work process. Understanding these symbols is fundamental for anyone involved in electrical planning and installation.