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692.61 Output Characteristics. <br /> <br />The output of a fuel cell system operating in parallel with <br />an electric supply system shall be compatible with the <br />voltage, wave shape, and frequency of the system to which <br />it is connected. <br /> <br />FPN: The term compatible does not necessarily mean <br />matching the primary source wave shape. <br /> <br />692.62 Loss of Interactive System Power. <br /> <br />The fuel cell system shall be provided with a means of <br />detecting when the electrical production and distribution <br />network has become de-energized and shall not feed the <br />electrical production and distribution network side of the <br />point of common coupling during this condition. The fuel <br />cell system shall remain in that state until the electrical <br />production and distribution network voltage has been <br />restored. <br />A normally interactive fuel cell system shall be permitted to <br />operate as a stand-alone system to supply loads that have <br />been disconnected from electrical production and dis- <br />tribution network sources. <br /> <br />692.64 Unbalanced Interconnections. <br /> <br />(A) Single Phase. Single-phase interactive fuel cell systems <br />shall not be connected to a 3-phase power system unless the <br />interactive system is designed so that significant <br />unbalanced voltages cannot result. <br /> <br />(B) Three Phase. Three-phase interactive fuel cell systems <br />shall have all phases automatically de-energized upon loss <br />of voltage, or unbalance of voltage in one or more phases, <br />unless the interactive system is designed so that significant <br />unbalanced voltages will not result. <br /> <br />692.65 Point of Connection. <br /> <br />The output of a fuel cell system power source shall be <br />connected as specified in 692.65(A) or (B). <br /> <br />93 <br /> <br /> <br />