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(A) Manually Operable
The disconnecting means for ungrounded PV conductors shall consist of a manually operable switch(es) or circuit breaker(s). The disconnecting means shall be permitted to be power operable with provisions for manual operation in the event of a power-supply failure. The disconnecting means shall be one of the following listed devices:
  1. A PV industrial control switch marked for use in PV systems
  2. A PV molded-case circuit breaker marked for use in PV systems
  3. A PV molded-case switch marked for use in PV systems
  4. A PV enclosed switch marked for use in PV systems
  5. A PV open-type switch marked for use in PV systems
  6. A dc-rated molded-case circuit breaker suitable for backfeed operation
  7. A dc-rated molded-case switch suitable for backfeed operation
  8. A dc-rated enclosed switch
  9. A dc-rated open-type switch
  10. A dc-rated rated low-voltage power circuit breaker
Informational Note: Devices marked with "line" and "load" are not suitable for backfeed or reverse current.
(B) Simultaneous Opening of Poles
The PV disconnecting means shall simultaneously disconnect all ungrounded supply conductors.
(C) Externally Operable and Indicating
The PV disconnecting means shall be externally operable without exposing the operator to contact with live parts and shall indicate whether in the open or closed position.
(D) Disconnection of Grounded Conductor
A switch, circuit breaker, or other device shall not be installed in a grounded conductor if operation of that switch, circuit breaker, or other device leaves the marked, grounded conductor in an ungrounded and energized state.
Exception No. 1: A switch or circuit breaker that is part of a ground-fault detection system required by 690.5, or that is part of an arc-fault detection/interruption system required by 690.11, shall be permitted to open the grounded conductor when that switch or circuit breaker is automatically opened as a normal function of the device in responding to ground faults.
Exception No. 2: A disconnecting switch shall be permitted in a grounded conductor if all of the following conditions are met:
  1. The switch is used only for PV array maintenance.
  2. The switch is accessible only by qualified persons.
  3. The switch is rated for the maximum dc voltage and current that could be present during any operation, including ground -fault conditions.
(E) Interrupting Rating
The building or structure disconnecting means shall have an interrupting rating sufficient for the maximum circuit voltage and current that is available at the line terminals of the equipment. Where all terminals of the disconnecting means may be energized in the open position, a warning sign shall be mounted on or adjacent to the disconnecting means. The sign shall be clearly legible and have the following words or equivalent:
WARNING
ELECTRIC SHOCK HAZARD
DO NOT TOUCH TERMINALS.
TERMINALS ON BOTH THE LINE
AND LOAD SIDES MAY BE ENERGIZED IN THE
OPEN POSITION
The warning sign(s) or label(s) shall comply with 110.21(B).
Exception to (A) through (E): A connector shall be permitted to be used as an ac or a dc disconnecting means, provided that it complies with the requirements of 690.33 and is listed and identified for use with specific equipment.

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