Siemens SIPROTEC 7XR81 Manual page 51

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The stripping length for use without bootlace ferrule is 10 mm to 12 mm (0.39 inch to 0.47 inch).
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The ferrule length (clamping section) of the bootlace ferrule is minimum 10 mm (0.39 inch) (e.g. DIN
46228-E1,5-10).
NOTE
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The connection to the rotor circuit has to be protected using a fuse with the proper rated voltage (e.g.
2000 V DC) 0.1 A T (time-lag).
NOTE
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Refer to 7UM62/7UM85 documents for connection examples.
SIPROTEC, Coupling Units for Generator Protection, Manual
C53000-H5040-C072-1, Edition 09.2018
7XR87 Voltage Divider for Excitation Voltage
4.2 Connection Notes
51