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systems shall not be connected to 3-phase power systems <br />unless the interconnected system is designed so that signifi- <br />cant unbalanced voltages cannot result. <br /> <br />(B) Three Phase. Three-phase inverters and 3-phase ac <br />modules in interactive systems shall have all phases auto- <br />matically de-energized upon loss of, or unbalanced, voltage <br />in one or more phases unless the interconnected system is <br />designed so that significant unbalanced voltages will not <br />result. <br /> <br />690.64 Point of Connection. <br /> <br />The output of a photovoltaic power source shall be <br />connected as specified in 690.64(A) or (B). <br /> <br />(A) Supply Side. A photovoltaic power source shall be <br />permitted to be connected to the supply side of the service <br />disconnecting means as permitted in 230.8(5). <br /> <br />(B) Load Side. A photovoltaic power source shall be per- <br />mitted to be connected to the load side of the service dis- <br />connecting means of the other source(s) at any distribution <br />equipment on the premises, provided that all of the follow- <br />ing conditions are met: <br /> <br />(1) Each source interconnection shall be made at a dedi- <br />cated circuit breaker or fusible disconnecting means. <br /> <br />(2) The sum of the ampere ratings of over current <br />devices in circuits supplying power to a busbar or <br />conductor shall not exceed the rating of the busbar or <br />conductor. Exception: For a dwelling unit, the sum of <br />the ampere ratings of the over current devices shall not <br />exceed 120 percent of the rating of the busbar or <br />conductor. <br /> <br />(3) The interconnection point shall be on the line side <br />of all ground-fault protection equipment. <br /> <br />Exception: Connection shall be permitted to be made to the <br />load side of ground fault protection, provided that there is <br />ground fault protection for equipment from all groundfault <br />current sources. <br /> <br /> 82 <br /> <br /> <br />