Which symbol is commonly used in wiring diagrams to represent a single-pole switch?
A straight line layout featuring a center break and a diagonal lever
Electrical wiring diagrams use standardised graphic symbols so that any electrician can read a circuit, and each device has its own agreed shape drawn on the conductor it belongs to.
A single-pole switch interrupts one live conductor, so its symbol is drawn directly on that line: a straight line with a break, bridged by a short diagonal lever that pivots to make or break the contact.
The diagonal lever is the key feature, because it visually shows the moving blade closing onto or lifting off the fixed contact when the switch is operated.
A continuous zigzag with sharp alternating bends is the standard symbol for a resistor, representing opposition to current, not a switching action.
A plain rectangle with two internal horizontal lines is used for components such as a heating element or a general boxed device, not a switch.
A small circle with a centred dot and no lever denotes a terminal, junction or connection point, which simply joins conductors rather than opening the circuit.
Hence, the answer is A straight line layout featuring a center break and a diagonal lever.
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