How should I connect aluminum wire ground?

I'm working in a building with aluminum wiring and I have to install some new outlets and replace lights.

All of existing splices are done with regular wire nut, even Al to Cu splices. Some shows signs of over heating (melted, discolored insulation).

So, I will be repairing splices in the junction boxes I work on with proper connectors.

I will be using AlumiConn 3 port connectors, but they are not cheap. Do I have to use special aluminum connectors for ground wiring as well or can I just twist and use regular wire nut for grounds?

If not, is connecting Al ground to metal junction box with grounding screw, then grounding Cu wire to the junction box is acceptable?

 

It's all a mess, but grounding to the box should be OK. It's hard to give advice on this one because the standard wirenut should be OK on grounds due to it not being a current carrying conductor; however wirenuts are not listed for use with aluminum, so it is a violation. Same deal for barrel crimps. I'd use some noalox paste no matter what.

Honestly given how much more likely homes with aluminum are to have electrical fires, I always do them on the up-and-up. CYA...

 

Thanks for the advise.

I am using plenty of Noalox every connection. Even sanding Al wires for connections showing signs of over heating.

One good thing (and only one thing) I find with Al wire is they are soft. Easy to push in to junction box.