I am using micro USB socket to charge the battery in one of the device and now we are planning to go for CE certification for which we are doing EMI/EMC test. For the ESD IEC 61000-4-2 (+/- 6 kV contact +/- 8 kV air) test standard. The outer shied of micro USB should be connected to ground. But in one of the reference diagram it is connected to ground via some resistor and TVS diode. (Schematic attached below).
Should I connect micro USB outer casing to ground or connect it via some resistor to ground and then employing TVS diode as shown in the schematic?
I think using the second technique the ESD pulse would not affect the common ground and will not affect the sensitive IC connected to the common ground.