Engineering certification for the installation of solar photovoltaic (PV) modules on wood roofs is often denied because existing wood roofs do not meet structural design codes based on conservative analysis and codes. This report provides results from a testing program that documents actual load-carrying capacity of residential rooftops built to existing building codes.
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Some states and utilities require installation of UEDS between PV power systems and the utility grid as a device to ensure line worker safety. However, eight states and many major utility companies have recognized that safety devices and features already part of all code-compliant PV systems make the UEDS redundant and have eliminated its requirement.