Ideally the IP-68 8C molded connectors for the extension cables will have plastic male and female threading parts since we don’t have to worry about them binding together over time when buried. We may choose brass connectors for the chassis connectors.

We could consider IP-67/68 if it passes our tests.Support maximum current 10-15A

Here’s more information for both CL-2 & TC/ER cables below for your reference and sourcing!