NEC 690
1500 V PV Strings, MC4 Evo2 and the Connector Mixing Problem: What Solar Installers Should Know in 2026
Residential strings are moving to 1500 V, Stäubli's MC4 Evo2 is the new reference connector, and NEC 690.33 now bars mixing connector brands. What that means for jumpers, combiners and the parts bin.
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