CCC 和 VDE 的实验室都确认过了,是不必要做的。The clause 25 b) of IEC 60884-1 and the clause "C" of the table 22A of VDE 0620-1 are nearly the same requirement, except of clause 25.2 which is required for plug inserts in VDE 0620-1 but not in IEC 60884-1. In our opinion the requirements for PVC- and rubber material are the same. Therefore the ball pressure test according cause 25.3 is not required for the PVC-moulding.