It's a matter of your company having a dwg that has all of the blocks that they use. I don't know the exact electrical standards, but I could probably send you a general; if you pay attention to what's used, it's pretty simple.
As long as you use blocks that you call out in your General Notes/Legend sheet, you can use smiley faces if you want.
Once you have that office-standard, you can copy/paste the whole sheet in, then just copy/paste the blocks as you need within whatever drawing you're working in.
Whatever clients your work with; see what they use, and that'll be the best way to determine what you should set up for your company's needs.
I'm sure there's somewhere that has a general set of symbols/blocks you'll need. I don't know of it personally, but most companies keep the same general symbols.