Longitudinal Protection from Moisture ingress

Tenderers are to include means of longitudinal protection to block moisture propagation longitudinally to the cable. The design and manufacturing shall be such so as the requirement of paragraph 19.22 of !EC 60502-2 is met and at the same time this insulation screen and copper wire screen are at an equipotential and the aluminium foil and copper-wire screen are at a galvanic contact. The use of swellable powder only shall not be accepted.

Radial Protection from moisture ingress

Tenderers are to include means for radial protection from moisture ingress. The protection shall be Aluminium foil tightly bonded to the PE sheath of minimum thickness of 0,2 mm and minimum overlap of 5 mm. Designs including foil as adding to the rating of Copper Wire screen shall not be accepted.

请问各位！上面是什么结构？谢谢

纵向阻水保护：投标文件应包括防止水分向电缆纵向传播的方法。电缆的设计和制造应符合IEC60502.2中19.22章要求，并且绝缘屏蔽和铜丝屏蔽应该是等电位，铝箔和铜丝屏蔽应是连电导通的。不允许仅采用阻水粉的方法。

径向阻水保护：投标文件应包括防止水分向电缆径向传播的方法。防护措施是，纵包铝箔应与PE外护套紧密结合，且铝箔厚度不小于0.2mm，纵包搭盖宽度不小于5mm。（最后一句话不太明白）

12/20kV电缆的绝缘厚度是5.5mm，楼主的12/20kV电缆是用于水下的吧。

用铝塑复合带纵包结构