PART III. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR
250.70 Grounding Electrode Conductor Termination Fitting.
The grounding electrode conductor must terminate to the grounding electrode by exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means. In addition, termination fittings must be listed for the materials of the grounding electrode.
When the termination to a grounding electrode is encased in concrete or buried, the termination fitting must be listed and identified for this purpose. No more than one conductor can terminate on a single clamp or fitting unless the clamp or fitting is listed for multiple connections. Figure 250.121
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