Let me try this question here

If I understand you correctly, a "Split bolt" is probably what you're looking for. There is also one (made of plastic?) that doesn't require wrapping but I have no idea of the name/mfgr.

An electrical supply house is where you want to ask/check to get the best answer for your purpose.

I've never attempted anything like this. However, I suspect you'll get a better set of answers if you give a little more information on your intended applications. Are you trying to make a whole-house extension cord? Splice a welder cable? Is the connection subject to mechanical stresses? High voltages?

Assuming I'm thinking of the right general kind of cable, asking in a welding group, stagecraft group (think tours with lighting dimmer racks that need to be tied into the house supply), "high-end" car audio group, or electrical supply house--depending upon the application--might be more likely to get good info than rec.woodworking. Enquiring about applicable local electrical codes might also be a good idea.

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Thanks, appreciate it.

JC

I see it at work all the time, all the way to 4/0, for 48V DC.

I've seen them welded with a special form, crimped to lugs, and connected with a heavy clamp-style bolt.

Any decent electrical house should have some options to show you.

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Yep, cad welded (thermite) splices, in-line splicer reducers and gutter tap connectors.

Thanks.

JC

Crimpers for this kind of cable are hydraulic; you crimp to a lug, and the lug bolts to a bus bar. My house breaker box is fed with two such crimp/lug/bus connections. I believe crimp couplers are also available, but not common.

If the cables are aluminum, there are electrode pastes and approved crimp terminals for that.

For a simple splice in Cu wires, the split bolt is recommended.