Control Panel Wiring and Electrical Safety Checklist
A five-page document for panel designers, panel builders and maintenance staff on automated machines. The first eight tables are for selecting components: why short circuit, overload and earth leakage need three different protections; what each protective device actually measures; MCB, MCCB, RCCB, RCBO and fuses compared; B, C and D trip curves by inrush current; six conditions for choosing a circuit breaker (load current, cable rating, Icu, curve, coordination, selectivity); contactor utilisation categories AC‑1, AC‑3 and AC‑4; overload relay classes 10, 20 and 30; and a worked 24VDC supply sizing example with 30% margin. The next three cover layout and earthing: four zones inside the panel, the difference between system earthing, the PE conductor and equipotential bonding, and shield rules for motor, analog and Ethernet cables. The last five are for checking and maintenance: cold check, power-on check and functional test; choosing a measurement by the question it must answer; five steps for tracing a 24VDC fault; the machine's energy map and the seven steps of lockout/tagout. Six checklists A–F (layout, protection, 24VDC supply, earthing, first power-up, LOTO procedure review) are meant to be ticked at the panel. Distilled from twelve articles in the Learn Automation with MINATA series; final values must follow the applicable standards and device catalogues.
What is inside
- Short circuit, overload, leakage — three protections
- What each protective device measures
- MCB, MCCB, RCCB, RCBO and fuses
- B, C and D trip curves
- Six conditions for choosing a breaker
- Contactor categories AC‑1 / AC‑3 / AC‑4
- Overload relay classes
- Sizing a 24VDC supply
- Zoning inside the panel
- Earthing: system, PE, bonding
- Shielding by cable type
- Three stages of wiring checks
- Choosing a measurement by its question
- Tracing a 24VDC fault
- Energy map and the seven LOTO steps
- Six checklists A–F
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