I'm starting to design things that run off mains voltage and I want to be sure that I have a proper connection from my chassis to earth ground.
I've been reading a bit about proper grounding and have learned the basics about stripping any paint off the chassis near the grounded point and connecting earth to the chassis as shown in this picture:
Finding the right hardware is easy enough, I plan on using all #10-32 machine screws and the associated nuts/washers.
I'm curious how other people on this site choose an "approved earth lug". I was thinking of using one of these.
I'm not exactly sure which agency's approval I am looking for. I'm also generally curious what other people have used in their designs. If some of you could share some part numbers for lugs you like to use, that would be helpful.
Additionally, I learned here that NEC requires the earth wire to be at least 14 AWG, while IEC requires 18AWG. I'm not exactly sure what situations call for meeting either of these specs.
So to summarize:
- Can someone give a few examples of ground lugs they like to use in their designs? Extra points if it doesn't require an expensive crimp tool.
- When is it important to use 14AWG rather than 18AWG for the earth wire?
[Edit: I should add a few notes that relate to agency approval. I live in the US and I'm designing devices for personal use, nothing to sell. None of my devices necessarily need to be approved by any agency, safety is my only real concern.]