UL SUBJECT 3703

Abstract

These requirements cover Solar Trackers intended for installation as freestanding units (that is, not attached to buildings), in accordance with the National Electrical Code, NFPA 70. Trackers intended to be installed in readily accessible locations are to be evaluated for all mechanical hazards as defined in this Outline. Products intended for installation in locations not readily accessible shall be evaluated with consideration given to the mechanical hazard requirements of this Outline. <br>These requirements cover the attachment of Listed flat-plate photovoltaic modules and panels, to the tracker platform, as well as the attachment of other Listed photovoltaic equipment attachment to the top of the tracker platform. <br>The tracker and its functions are to be evaluated with respect to risk of electric shock and fire hazards, as well as the mechanical loading of the platform in accordance with the Outline of Investigation for Rack Mounting Systems and Clamping Devices for Flat-Plate Photovoltaic Modules and Panels, Subject 2703. <br>These requirements cover solar trackers intended for use with photovoltaic module systems with a maximum system voltage of 1000 V. <br>These requirements do not cover: <br>a) Equipment intended to accept the electrical output from the array, such as power conditioning units (inverters/converters) and batteries; <br>b) Cell assemblies intended to operate under concentrated sunlight; <br>c) Charge controllers; <br>d) Optical concentrators; <br>e) Trackers installed in non-restricted access locations; <br>f) Trackers that are intended to operate in stow mode (placing the PV modules in an inverted positioning); <br>g) Mechanical or structural integrity of the tracker under wind conditions, and uplift conditions of the tracker base and base to platform connection; <br>h) Trackers installed in offshore and/or locations above standing water; and <br>i) Lightning striking the tracker.