I'm trying to attach a #8 solid bonding wire to an aluminum window frame that's about 3 feet away from a new spa. I can't seem to find any type of listed clip that will work - all of the standard press-on grounding clips only work up to #10 wire, and I haven't found anything else that will work.

I could drill a small hole in the frame and bolt on a copper grounding lug, but not sure if that's to code. Anyone have any suggestions or pointers to some type of clip that might work?

As you might have guessed, the local inspector can be really picky about (sometimes irrelevant) details!

Thanks!

Bolt + Ground Lug= Good connection plus it kinda looks official. Especially if you use a stainless steel bolt and nut.

Sounds like the best alternative.

Inspectors like things that look good and at least appear to be functional... (well let's just say - appear to meet code).

But grounding to a window? What's the window grounded to?

I mean no offense, but I think the inspector's ladder doesn't reach the top. Never have I heard of any inspector requiring ALL metal within a distance from a tub be grounded, especially a window frame. In any case, when bonding aluminum conductors, you need to use lugs rated for use with aluminum. Copper against aluminum will corrode due to electrolisis of the two metals...like a battery. There are special coatings you would need to use in this situation. BTW after skimming through the National Electric Code book, I didn't run across an instance noting any type of grounding in this manner for this situation. Perhaps your inspector can show you this notation?