You insert it from the bottom of the clip, the part that will be inside the box. Leave it extend above the clip about 1/2". Now, push the clip down over the side of the box (with whatever will work), bend the 1/2" tail over the side of the box and trim it off if necessary.
That said, these things are a big PITA! I rarely use them and, as said, will only work on a straight sided box.
[This message has been edited by hbiss (edited 04-07-2004).]
...Somehow they don't look anything like as secure as attaching the ground wire with a screw.
That's why I don't like to use 'em. Not only are they a pain, but I've seen them installed incorrectly several times (which led to a really poor connection) and even when done properly, some of them didn't seem to grip the conductor very well. I prefer a ground screw any day of the week.
That being said, if I ever ran into a job with a bunch of old boxes that didn't have tapped holes for ground screws, I'd probably use the clips instead of spending all that time drilling and tapping.
#36461 - 04/08/0405:34 PMRe: Grounding clips: How do you attach and do you trust 'em?
I actually found one of those in a branch circuit panel the other day. Somebody twisted a few bare grounds together, left one of them longer, and placed it under a grounding clip on the protruding steel tab over the main breaker. Didn't have a camera so I just rolled my eyes 'n fixed it.
#36462 - 04/08/0405:42 PMRe: Grounding clips: How do you attach and do you trust 'em?