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Part VIII Direct-Current Systems
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Part VIII Direct-Current Systems
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Part VIII Wiring and Protection, Direct-Current Systems
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 250 Grounding and Bonding > VIII Direct-Current Systems
685.12 Special Equipment, Direct-Current System Grounding
Two-wire dc circuits shall be permitted to be ungrounded ...
National Electrical Code 2020 of Minnesota > 6 Special Equipment > 685 Integrated Electrical Systems > 685.12 Direct-Current System Grounding
(2) Wiring and Protection, Feeders Supplied From Direct-Current Systems
Where a feeder is supplied from a dc system operating at more than 60 volts, each ungrounded conductor of 4 AWG or larger shall be identified ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 215 Feeders > 215.12 Identification for Feeders > (C) Identification of Ungrounded Conductors > (2) Feeders Supplied From Direct-Current Systems
(C) Wiring Methods and Materials, Reverse Polarity (Backfeed) Protection of Direct-Current Systems
A suspended ceiling low-voltage power distribution system shall be permitted to have reverse polarity (backfeed) protection of dc circuits by one ...
National Electrical Code 2020 of Minnesota > 3 Wiring Methods and Materials > 393 Low-Voltage Suspended Ceiling Power Distribution Systems > 393.45 Overcurrent and Reverse Polarity (Backfeed) Protection > (C) Reverse Polarity (Backfeed) Protection of Direct-Current Systems
(2) Wiring and Protection, Branch Circuits Supplied From Direct-Current Systems
Where a branch circuit is supplied from a dc system operating at more than 60 volts, each ungrounded conductor of 4 AWG or larger shall be identified ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 210 Branch Circuits > 210.5 Identification for Branch Circuits > (C) Identification of Ungrounded Conductors > (2) Branch Circuits Supplied From Direct-Current Systems