FYI.
In the UK, there are 3 specific standards relating to the design, build and testing of electrical control panels for machinery and environmental (HVAC) control systems.
1. BS60204. Industrial Control Equipment. (For design and testing detail of the panel itself.)
2. BS7671. Electrical...
Wiring up a small relay based circuit is a great way to grasp the basics before realising the benefit of moving on to using miniature PLCs and the like.
If you start out by specifying what small automation project you want to create, then that will get you ready to select components, figure out...