Determine NEC voltage class, equipment ratings, and code requirements based on PV system maximum voltage.
Input Parameters
Results
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Temp-Corrected Voc/Module
V
--
Max System Voltage
V
--
NEC Voltage Class
--
Min Equipment Rating
V
Note: Most residential systems are 600V class. 1000V permitted on commercial. 1500V for utility-scale with qualified personnel only. All equipment must be voltage-rated.
Reference
Corrected Voc = Voc_STC x (1 + TempCoeff/100 x (25 - T_min))
Max System Voltage = Corrected Voc x Modules/String
600V: residential, 1000V: commercial
1500V: utility-scale only
Per NEC 690.7