CSA C451:26

Description

Preface This is the first edition of CSA C451, Standard test method for the dynamic wind pressure resistance of photovoltaic roof assemblies. This Standard is applicable to photovoltaic roof assemblies that can be installed on the majority of low-slope roof assemblies in North America. It is based on ongoing research and testing carried out by the National Research Council Canada (NRC). It provides a test method for evaluating the resistance of a photovoltaic roof assembly (PVRA) to the dynamic wind pressures applied to it. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of the NRC-led PVRA consortium. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was prepared by the Subcommittee on the Standard Test Method for Dynamic Wind Pressure Resistance of PVRAs, under the jurisdiction of the Technical Committee on Solar Photovoltaic Energy Systems and the Strategic Steering Committee on Performance, Energy Efficiency and Renewables, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 General This Standard covers the test method that determines the wind pressure resistance of photovoltaic roof assemblies, applicable for low-slope roofs, when subjected to dynamic wind loading cycles induced by actuators in laboratory conditions. 1.2 Inclusions This Standard applies to photovoltaic arrays with tilt angle no greater than 35° from roof surface, constructed on partially attached (hybrid) or adhesive-applied membrane roofing systems (PARS and AARS). 1.3 Exclusions This Standard is not applicable to photovoltaic arrays constructed on mechanically attached membrane roofing systems (MARS), vegetated roof assemblies (VRA), protected membrane roofs, or loose-laid membrane roofing systems. 1.4 Terminology In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 1.5 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.