Originally Posted by P-J
I suggest that you read the code that applies to the building wiring when it was installed.
I'll do that.
You might learn something.
I'm always willing to improve my understanding.
Here's something to improve yours.
I am an Industrial Controls Tech. I maintain, repair and upgrade control systems like these every day. I showed your E-stop circuit to our Electrical Design Engineering group. Degreed Engineers with collectively over a century experience. Every one of them said it was a bad design.
Will it work? Probably.
Is it a good way to implement an E-stop? No.
Is an E-stop needed? No. Electrical failures happen too quickly and the E-stop button is located next to whatever disconnect you have anyway.
Don't get me wrong. The schematics you have provided are otherwise fine and I appreciate the free service you have provided to members of this forum.
If you want a detailed explanation of why the engineers didn't like your circuit I will be happy to have one of them contact you.