Tightening Torques for Terminal Screws
Type of Line
Current Terminal
Voltage Terminal with
Spring-Loaded Terminals
Voltage Terminal with
Screw Connection
Stranded wires with ring-
type lug
2.7 Nm
No ring-type lug
No ring-type lug
Stranded wires with boot-
lace ferrules or pin-type
lugs
2.7 Nm
1.0 Nm
0.6 Nm
Solid conductor, bare
(2 mm
2
)
2.0 Nm
1.0 Nm
–
Bare stranded wire
Not permitted
1 Nm
0.6 Nm
i
i
NOTE
For current and voltage terminals, the maximum speed of the tool must not exceed 640 rpm.
i
i
NOTE
Use copper cables only.
Torques for Other Screw Types
Screw Type
Torque
M4 x 20
1.2 Nm
M4 x 8
1.2 Nm
M2.5 x 6
0.39 Nm
Countersunk screw, M2.5 x 6
0.39 Nm
Countersunk screw, M2.5 x 8
0.39 Nm
Collar screw, M4 x 20
0.7 Nm
Technical Data
12.1 General Device Data
800
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020