Just read what John and Greg wrote and would add the words in 250.64(C) and that is the only place I find the word "irreversible", when they are taking about splicing the GEC. This gets used for example when the main service panel is being relocated and they want to extend the GEC to the new location instead of installing a whole new wire. Beyond that I think you can use exothermic welding or connectors Listed for grounding and bonding. I'm sure you could also us an "irreversible" connector if you choose to but that would probable depend on what was on the truck
250.64(C)(1)
