🔍 Key Concepts

• Difference between a wiring diagram and a schematic/ladder diagram in terms of physical layout vs. functional logic • What a one-line diagram typically looks like and what it omits • How a block diagram represents components compared to detailed contacts, coils, and connections

💭 Think About

• Look at how the contacts, coils, and windings are shown. Are they drawn to show physical location/terminal numbering, or mainly to show how the control logic works? • Ask yourself whether each individual conductor is drawn, or if the drawing collapses phases/components into single symbols, as in a one-line representation. • Consider whether the drawing is made of simple labeled boxes with minimal internal detail, or if it shows specific switches, interlocks, and transformer taps.

✅ Before You Answer

• Check whether the drawing shows individual contacts and relay coils with standard schematic symbols (typical of one specific type of diagram). • Verify if the three power phases (L1, L2, L3) are shown separately or collapsed into one line, which would be typical of a one‑line diagram. • Confirm whether the diagram attempts to show physical cable routing and exact terminal locations (wiring diagram) or just the logical operation of the controller.