[timun]

Originally Posted by PaperBagger'14

Also a little research would show that there are in fact marrettes for aluminum wiring, you can even find them at specialty electrical stores like home depot.

https://www.homedepot.ca/product/mar...ck-/1000148262

Okay, I stand corrected. I've only ever seen the purple Al-to-Cu ones. I'll freely admit this limitation is completely irrelevant to me as I have no aluminum wiring in my house, but it stands to reason a professional has to deal with Al-to-Al sometimes.

A quick contact resistance test would prove you wrong, it's actually very easy to prove with a ductor and about 10 seconds of time.

I thought you meant that the mechanical connection is worse. From the youtube videos I've watched of people using them they're very snug and resist a tug test better than a wire nut.

With respect to the electrical connection, I would imagine they have a slightly higher resistance because the conductors are not in direct contact, but I find it incredulous that it'll make much of a difference. At least, on typical 120 VAC/15 A circuits the likes you'd find in a house.