UL 2703-2021 pdf free download.Mounting Systems, Mounting Devices, Clamping/Retention Devices, and Ground Lugs for Use with Flat-Plate Photovoltaic Modules and Panels. 4.2 A component is not required to comply with a specific requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 4.3 A component shall be used in accordance with its rating established for the intended conditions of use. 4.4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions. 5 Undated References 5.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 6 General ] 6.1 Rack mounting system and all components shall be designed with suitable materials and at sufficient material thickness for structural integrity for the loads the rack system will be subject. Materials shall also have suitable corrosion resistance (see Section 10). Any dissimilar metals that significantly contribute to galvanic corrosion shall not be utilized. The electrochemical potentials table of Figure 6.1 shows various common metal combinations. Combinations below the table cutoff line, 0.6 V or less, are considered to be acceptable. Inherently, corrosion resistant metals that are not dissimilar, for example an austenitic stainless steel fastener used on an austenitic stainless steel clamp, are not subject this requirement. Exception No. 1: Forthe combination ofaustenitic stainless steel (i.e. 300-series stainless steel) and zinc galvanized material; if the immediate adjacent area of materials zinc galvanized to austenitic stainless steel is greaterthan 2:1, the galvanic potential maybe considered as 0.6 V. Exception No. 2: 5000 and 6000 series aluminum alloys are considered Al/Mg alloy (although some in these series ofalloys may contain additional alloying elements). Forexample, an austenitic stainless steel fastenerused with 5000 series aluminum rail would be 0.55 Vin Figure 6.1.UL 2703 pdf download.
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