Turns out 4 AWG connectors are too large for 4 AWG stranded THHN ground wire. Apparently 4 AWG wire with coarse strands have a smaller diameter than 4 AWG wire with finer strands. The solution is to use 6 AWG connectors despite the cable being 4 AWG. Warning: measure the diameter of your wire and connectors, and validate that the connectors you are using are the appropriate rating for the work you are doing.

Thanks to the staff at TEMCo Industrial for the information about crimpers and connectors for the type of wire that I am using. They make several types of crimping devices and connectors. Here are some links if you are interested in checking them out:

TEMCo crimpers: [ Ссылка ]
TEMCo 6 AWG connectors: [ Ссылка ]

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