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A switchboard, switchgear, or panelboard containing an ungrounded dc electrical system in accordance with 250.169 shall be legibly and permanently field marked as follows:
CAUTION: UNGROUNDED DC SYSTEM OPERATING — _____ VOLTS BETWEEN CONDUCTORS

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712.30 Special Conditions, System Voltage
and ungrounded dc systems. Informational Note: Examples of nominal dc system voltages include but are not limited to 24, 48, 125, 190/380, or 380 ...
712.30 Special Conditions, System Voltage
and ungrounded dc systems. Informational Note: Examples of nominal dc system voltages include but are not limited to 24, 48, 125, 190/380, or 380 ...
712.2 Special Conditions, Definitions
A source that supplies the majority of the dc load in a dc microgrid. Ungrounded DC System. A system that has no direct or resistive connection ...