Disconnecting Means, Equipment. Means shall be provided to disconnect power production equipment, such as utility interactive inverters or transformers associated with a power production source, from all ungrounded conductors of all sources of supply. Equipment intended to be operated and maintained as an integral part of a power production source exceeding 1000 volts shall not be required to have a disconnecting means.

705.22 Disconnect Device. The disconnecting means for ungrounded conductors shall consist of a manually or power operable switch(es) or circuit breaker(s) with the following features:

(1) Located where readily accessible

(2) Externally operable without exposing the operator to contact with live parts and, if power operable, of a type that could be opened by hand in the event of a power-supply failure

(3) Plainly indicating whether in the open (off) or closed (on) position

(4) Having ratings not less than the load to be carried and the fault current to be interrupted. For disconnect equipment energized from both sides, a marking shall be provided to indicate that all contacts of the disconnect equipment might be energized.

FPN No. 1 to (4): In parallel generation systems, some equipment, including knife blade switches and fuses, is likely to be energized from both directions. See
240.40.
FPN No. 2 to (4): Interconnection to an off-premises primary source could require a visibly verifiable disconnecting device.

(5) Simultaneous disconnect of all ungrounded conductors of the circuit

(6) Capable of being locked in the open (off) position

705.30 Overcurrent Protection. Conductors shall be protected in accordance with Article 240. Equipment

and conductors connected to more than one electrical source shall have a sufficient number of overcurrent devices located so as to provide protection from all sources.

(A) Solar Photovoltaic Systems. Solar photovoltaic sys- tems shall be protected in accordance with Article 690.

(B) Transformers. Overcurrent protection for a trans- former with a source(s) on each side shall be provided in accordance with 450.3 by considering first one side of the transformer, then the other side of the transformer, as the primary.

(C) Fuel Cell Systems. Fuel cell systems shall be pro- tected in accordance with Article 692.

(D) Utility-Interactive Inverters. Utility-interactive in verters shall be protected in accordance with 705.65.

(E) Generators. Generators shall be protected in accor dance with 705.130.

705.32 Ground-Fault Protection, here ground-fault protection is used, the output of an interactive system shall be connected to the supply side of the ground- fault protection.

Exception: Connection shall be permitted to be made to the load side of ground-fault protection, provided that there is ground-fault protection for equipment from all ground-fault current sources.

705.40 Loss of Primary Source. Upon loss of primary source, an electric power production source shall be automatically disconnected from all ungrounded conductors of the primary source and shall not be reconnected until the primary source is restored.

Exception: A listed utility-interactive inverter shall be permitted to automatically cease exporting power upon loss of primary source and shall not be required to automatically disconnect all ungrounded conductors from the primary source. A listed utility-interactive inverter shall be permitted to automatically or