If the lamp turns ON but motor does NOT run → suspect OL contact miswired: it interrupts lamp path but not K1. Based on field service reports from automotive and HVAC industries (2015–2025):
| Component | IEC symbol feature | ANSI equivalent | |-----------|----------------|----------------| | Normally open contact | ——/ —— | -] [- | | Normally closed contact | ——/\ —— (with slash) | -]/[- | | Relay coil | Rectangle with label K1 | Circle with label CR1 | | Thermal overload relay | Two bent lines (bimetal) | Square with “OL” | elektrotechnicka schemata a zapojeni v praxi 1 pdf
Practical resources emphasize the as the primary troubleshooting tool, because it abstracts away physical location and focuses on current paths. 3. Symbol Standardization (IEC vs. ANSI) In Czech practice, IEC 60617 is mandatory. Critical differences from ANSI that cause confusion: If the lamp turns ON but motor does