The metal wire is not parallel to the surface of the roof was just becuase the two indicated insolators are not in the same surface. In order to improve this issue, our engineers provide two options as below:Option 1: Could we leave the metal wire outside of the slot of the indicated insolators? See the above picture shown.Option 2: Add the height of indicated insulators' base steps by 0.50mm. After making this modification, the left side metal wire need to be shorten by 2.00mm so that the wire won't touch with the pantongraph.