I Use Ilscp PBTS NIMUS connectors.
These are what 90% of the electricians use when splicing wires together. They use screw terminals to make the splice secure. Make great mechanical connection and will not become loose because of heat causing the wire to expand and contract. They are totally insolated and will pass any electrical code requirement.
You can get them at Home Depot.
The PBTS-2-4 are good for wire from 4 to 14 gauge.
These are what 90% of the electricians use when splicing wires together. They use screw terminals to make the splice secure. Make great mechanical connection and will not become loose because of heat causing the wire to expand and contract. They are totally insolated and will pass any electrical code requirement.
You can get them at Home Depot.
The PBTS-2-4 are good for wire from 4 to 14 gauge.