Electric motors Size 63 - 225 ATEX / IECEx
Maintenance
52
2021-05-31
Pos : 9. 29 /KN 2006-Pr ojekte/Herf order Elektromot oren-Wer ke/ Wart ung/1.1 Sc hraubenanz ugsdr ehmomente @ 67 \ mod_1208937207889_1. doc @ 1150009
9.4 Tightening torque values for screws
Explosion protection
EXPLOSION PROTECTION!
The introduction of ignition sources such as sparks,
open flames and hot surfaces can cause
explosions in the potentially explosive area.
Therefore, when carrying out all maintenance work
on the machine in the potentially explosive area:
– Do not start any maintenance work without a
written permit.
– Only carry out maintenance work to the
exclusion of a potentially explosive atmosphere.
– Only use tools which are approved for use in
the potentially explosive area.
Failure to adhere to these instructions will lead to
a loss of the explosion protection.
NOTE!
Strength class 8.8 screws must be used for all
screwed connections which are used to seal
the pressure-resistant space.
Replace screws which can no longer be used with
new screws of the same type and strength class.
If not otherwise stated, the following tightening torque values apply
for screw connections.
9.4.1 Tightening torque values for screws for electrical connections
Thread
Tightening torque
value [Nm]
Thread
Tightening torque
value [Nm]
M 4
1.2
M 12
15.5
M 5
2
M 16
30
M 6
3
M 20
52
M 8
6
M 24
80
M 10
10
M 30
150
