Heavy Duty Copper C Tap Grounding Connector For 4/0 to 1 Awg Applications: Copper "C" Taps Ensure Positive, All Around Compression With Low-Resistance and High Pull-Out Values. Made Of High Conductivity Copper, They Satisfy The Requirements Of NEC250-81 and 250-91 For Connecting to The Grounding Electrode System. Rated 600 Volts.