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
NOTE
For current and voltage terminals, the maximum speed of the tool must not exceed 640 rpm.
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
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