Came away with a different lens on refactoring legacy electrical layouts without blowing up existing infra. The grounding and bonding chapter stuck, especially the subpanel walkthrough where the neutral/ground tie gets relocated and the knock-on effects are traced. It bridged to how I think about arch changes in prod—how a tweak lands in the repo, survives a PR, and shows up in obs. Wasn't sold on the short motor-starting calc section; wished there was more on fault current, but it did close the gap between what I knew and what I thought I knew.

At first glance, the topics looked familiar, but the depth surprised me. Coming from a working background in oil & gas facilities and some crossover automotive automation projects, the way the course tied control panel design to real operating constraints stood out. The sections on PLC I/O schematics and IEC vs NEC differences helped close a gap I’ve had when reviewing vendor panels for compressor skids and test benches. One challenge was keeping up during the CAD-based schematic work. Moving from concept to a clean, standards‑compliant drawing in EPLAN took more effort than expected, especially around wire numbering and terminal planning. That said, struggling through that part mirrored real project pressure more than a polished demo would have. The most practical takeaway was a clearer method for panel layout—spacing, heat dissipation, and grounding decisions now feel intentional instead of rule-of-thumb. The safety modules, especially LOTO and grounding practices, directly apply to both refinery panels and automotive assembly cells where audits are common. This wasn’t abstract theory; it lined up with panels I’ve actually had to troubleshoot during commissioning. I can see this being useful in long-term project work.