A.4.2 Tools and tightening torques
Fastening/unfastening components
Component Fastening/unfastening Tool Tightening torque
Mounting rail Drill hole: Diameter 6.4 mm
Screw M6
Wrench for screw M6 4 Nm to 6 Nm
CFU
Fixing screws on both sides of the
CFU
Screwdriver TORX T15 or
with 3 to 3.5 mm blade width
0.5 Nm
BusAdapter Screw is located in the BusAdapter Screwdriver
with 3 to 3.5 mm blade width
0.25 Nm
Cables on the plugs
You can find additional in‐
formation on this in the sec‐
tion "Preparing cables
(Page 63)".
Fixing screw on the screw terminal Screwdriver
with 3 to 3.5 mm blade width
min 0.4 Nm / max
0.5 Nm
Stranded wires without wire end fer‐
rule with push-in terminal
Screwdriver
approx. 3 mm blade width
Not applicable
CFU PA only: Shield con‐
nection for process cable
(shield terminal)
Spring terminals Not required Not applicable
CFU in aluminum housing
Cover screws M6
(Screws are fitted in the cover)
Screwdriver PH2 or
with 9 mm blade width
2.5 Nm to 3 Nm
Mounting rail Drill hole: Diameter 6.4 mm
Screw M6
Wrench for screw M6 Pre-assembled
Cable glands
(connection thread of the
cable gland)
M20x1.5:
approved for cable diameters from 7
mm to 13 mm (with reducing insert 4
mm to 8mm)
Wrench for SW24 cable
glands
Preassembled (2.3 Nm)
Cable glands
(cap nuts)
M20x1.5 with gasket ring Wrench for SW24 cable
glands
1.5 Nm
Functional earth Functional earth on the housing
(left part of the housing without pene‐
tration of its wall - cross-section acc.
to EN 60079‑14)
Screwdriver 8 mm blade
width
2.5 Nm to 3 Nm
Pressure compensation el‐
ement
M12 Wrench for screw SW17 Pre-assembled (1 Nm)
A.4.3 Cable cross-sections and ferrules
Cables with and without wire end ferrule
Rule for ... Connections PS<n> Connections FB<n> and DIQ<n>
Permitted cable cross-sections for solid cables 0.2 to 2.5 mm
2
AWG
*
: 24 to 13
Appendix
A.4 Mounting rules
SIMATIC CFU
186 Commissioning Manual, 08/2019, A5E39252870-AD