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(B) Special Conditions, Over 300 Volts
DC microgrids operating at voltages greater than 300 volts dc shall be reference-grounded dc systems or resistively grounded dc systems ...
(B) Special Conditions, Over 300 Volts
DC microgrids operating at voltages greater than 300 volts dc shall be reference-grounded dc systems or functionally grounded dc systems ...
(A) Wiring and Protection, Two-Wire, Direct-Current Systems
with 250.20 shall not be required to be grounded. Exception No. 3: Direct-current fire alarm circuits having a maximum current of 0.030 ampere as specified ...