What type of wire splice is permitted to be used to connect a grounding electrode conductor that is too short?

A listed split-bolt connector is the correct choice for connecting a grounding electrode conductor that is too short. These connectors are specifically designed for joining conductors and are tested to ensure they meet safety and performance standards. They provide a secure, reliable, and code-compliant method to make electrical connections, particularly in applications involving grounding and bonding where maintaining a low-resistance connection is crucial for safety.

While twisted wires and soldered connections may be common practices in some wiring scenarios, they do not typically meet the requirements set by the National Electrical Code (NEC) for grounding systems. Twisted wires can be less reliable over time due to corrosion or loosening, and soldered connections do not offer the same mechanical strength and may fail under stress or movement. Therefore, using listed split-bolts is the preferred method for ensuring that the splice remains secure and compliant with electrical codes.