Which symbol is used to denote four-way switching in diagrams?

Which symbol is used to denote four-way switching in diagrams?

• A. S6
• B. S4
• C. S3
• D. S2

Answer: (B)

Four-way switching involves an intermediate switch placed between two end switches to let a load be controlled from multiple locations. In diagrams, each switch type is given a designation, and the symbol used for a four-way switch is S4. This label reflects that the device has four terminals and can connect two traveler pairs, enabling the circuit to be completed from different end positions. The other symbols represent different switch configurations and do not indicate this four-terminal, intermediate function, so they aren’t used for four-way switching.

Four-way switching involves an intermediate switch placed between two end switches to let a load be controlled from multiple locations. In diagrams, each switch type is given a designation, and the symbol used for a four-way switch is S4. This label reflects that the device has four terminals and can connect two traveler pairs, enabling the circuit to be completed from different end positions. The other symbols represent different switch configurations and do not indicate this four-terminal, intermediate function, so they aren’t used for four-way switching.