Concerning § 7.2.2 of the Technical Specification (Factory Type Test on SCB):
"1) TFC FDU and mock‐up: A direct voltage equal to the nominal value plus 10%, with duration of 1 minute shall be applied to the turned‐off Static CB. The test shall be repeated 3 times for each polarity."

We have three questions:
a) When SCB opens, the voltage of 5.2/5.5 kV appears for a time of some seconds across the SCB, and then decreases as the current in Dump Resistors goes to zero. Snubber and clamp resistors are designed in energy for this duty. May them be disconnected during this test lasting 60 seconds?
b) According to fig. 7 of TS, FDU are designed for unidirectional current flow. So the voltage at SCB opening develops in one polarity only. Is this correct? If yes, in our opinion the test voltage shall not be reversed
c) Does this holds for the Mock-up too?