I need to join 4 wires together: a 6 gauge wire, two 10 gauge wires and a 22 gauge wire. The 6 gauge wire is the current source, the two 10 gauge wires will draw a continuous current of up to 30A and the 22 gauge wire about 20 mA. I need to do that twice - one for each leg of a 208/240v circuit. This is for an electric vehicle charging application.

I have been using a large size wire nut for this, but twice now it has failed due to overheating.

Left to my own devices, my next attempt would be with a split nut, but then I'm going to need to wrap it all in a mile of electrical tape.

This is all going to be inside of a sealed chassis. The chassis will be portable, but all of the wires will have strain relief at the chassis entrance.

I need to join 4 wires together: a 6 gauge wire, two 10 gauge wires and a 22 gauge wire. The 6 gauge wire is the current source, the two 10 gauge wires will draw a continuous current of up to 30A and the 22 gauge wire about 20 mA. I need to do that twice - one for each leg of a 208/240v circuit. This is for an electric vehicle charging application.

I have been using a large size wire nut for this, but twice now it has failed due to overheating.

Left to my own devices, my next attempt would be with a split bolt, but then I'm going to need to wrap it all in a mile of electrical tape.

This is all going to be inside of a sealed chassis. The chassis will be portable, but all of the wires will have strain relief at the chassis entrance.