IEC TS 62788-5-2:2020提供了评估边缘密封防止水分从光伏组件边缘进入的能力的指南。本文件不包括框架粘合剂（有时通俗地称为边缘密封），其设计不能有效防止水分进入。边缘密封件应防潮、保持粘附，并与环境保持电气绝缘。大部分测试可以在材料层面上进行，但考虑到存在多个表面、材料相互作用和机械应力，有必要在微型模块或模块上进行测试。为了实现这一点，本文档包含三种类型的测试样本类型、材料、微型模块和全尺寸模块。其目的是仅使用材料进行快速评估和比较。随后将使用小型模块进行更严格的测试，所有接口都正确表示。 最后，使用全尺寸模块测试来评估实际的构建过程，以解决意外问题。

IEC TS 62788-5-2:2020 provides guidelines to assess the ability of an edge seal to prevent moisture ingress from the edges of PV modules. This document does not cover frame adhesives (sometimes colloquially referred to as edge seals) which by design do not serve to prevent moisture ingress to a meaningful degree. Edge seals should keep moisture out, remain adhered, and maintain electrically insulation from the environment. Much of the testing can be done on the material level, but given the fact that there are multiple surfaces, materials interactions, and mechanical stresses, testing on mini modules or modules is necessary. To accomplish this, this document contains three types of test sample types, materials, mini-modules, and full-size modules. It is intended that a quick evaluation and comparison can be made using materials only. This would be followed up by more rigorous tests using mini-modules where all the interfaces are correctly represented. And finally, full-size module tests are used to evaluate the actual construction process to allow unanticipated concerns to be addressed.