IEC 62938:2020 provides a method for determining how well a framed PV module performs mechanically under the influence of inclined non-uniform snow loads. This document is applicable for framed modules with frames protruding beyond the front glass surface on the lower edge after intended installation and as such creates an additional barrier to snow sliding down from modules. For modules with other frame constructions, such as backrails formed in frames, on the side edges, on the top edge and on the lower edge not creating an additional snow slide barrier, this document is not applicable. The test method determines the mechanical non-uniform-load limit of a framed PV module.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3 Terms and definitions 4 Sampling <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5 Prerequisites 6 Testing 6.1 General 6.2 Projections of the test results 6.3 Test plan <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figures Figure 1 \u2013 Test plan for inhomogeneous snow load test <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 7 Test procedures 7.1 Visual inspection 7.2 Maximum power determination 7.3 Insulation test 7.4 Wet leakage current test 7.5 Humidity-freeze test 7.6 Electroluminescence imaging 7.7 Non-uniform snow load test 7.7.1 Purpose 7.7.2 Load specification <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 2 \u2013 Distribution of load on the test specimen at inclination Tables Table 1 \u2013 Applicable load in relation to angle of pitch of roof <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 7.7.3 Apparatus <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figure 3 \u2013 Simplified cross-sectional view of module width along bottom frame <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7.7.4 Procedure <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 4 \u2013 Test procedure for the snow load test Figure 5 \u2013 Different deflection graphs under static load <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8 Fail criteria 9 Verification of the test results 10 Statistical analysis 10.1 General <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 10.2 5 % fractile value with Student’s distribution 10.3 Safety factor 10.4 Example 10.5 Quantiles of the t distribution (Student’s distribution) <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 11 Test report Table 2 \u2013 Quantiles of the t distribution (Student’s distribution) <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 12 Modifications <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Annex A (informative)Use of determined values A.1 Estimated snow loads and use of the determined resistance A.2 Calculate the bearable loads for different angles <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Photovoltaic (PV) modules. Non-uniform snow load testing<\/b><\/p>\n |