wiring a 3 way switch with BX

i have 3 questions relating to my sconce that i'm installing to a 3 way switch.

1) The sconce has aluminum wires. do i connect these with regular wire connectors to my copper wire that runs to the power source?

2) one run of the 3 way leg is old BX wire, grounded with a metal sheath. does the sheath ground by being connected with a compression fitting to a metal junction box? also, the older copper wires are in really good shape (no cracked insulation, but the copper is really dark. is this ok to connect to the new copper wires?

any other advice on working with old BX that is in otherwise good condition? i'm a bit confused on how the metal sheath serves as the ground.

3) does it matter what kind of screw (metal type) that i'm using for or the grounding screw? my current box has no grounding screw, so i was going to take another screw and use that as the grounding screw.

 

Most likely it is tinned copper not aluminim. Use regular wire nuts.

It should be OK.

Make sure you use the red hats in the end of the BX. Yes it matters for the grounding screw. You can not use a sheet metal screw. You can buy special ground screws.

 

not the linux software distributor!

thanks for your help!

 

Yes, it is Red Hat Linux 8.0. Just take that CD, heat it up a bit, and mold it over the sharp edges of the BX. It's what Torvalds would do!

Or perhaps Joe means anti-short BX flex bushings, those plastic things that protect conductors from sharp edges. Cost a few cents each and come in bags.