What is insulink?

Can I run two different size wires on same circuit?

Yes, #2 wire can be spliced in a couple of ways. There is a device on the marked called an Insulink. The two ends of the wires are stripped about an inch in length and inserted into each end of the link. There is a special crimping tool that is used to crimp the wires into the link. You can find these types of splices in home distributions where the utility company connects to the wires that protrude from the weather head. Another type of splice for this size of wire is using #2 wire lugs on each end of the wire and then bolting the two lugs together back to back. This type of splice is used in motor connections. The splice is then half lap double wrapped with rubber amalgamation tape and then half lap double wrapped with regular electrical tape.