TAVRIDA ELECTRIC ISM15_LD_1 Series, Application Manual

Page: 22 / 70

22
Mechanical Interlocking
The ISM provides the following interfaces for interlocking (Figure 32):
· Stub shafts at both sides with grooves and tapped holes (Figure 32,
details 1 and 3).
· Two interlocking pins with tapped holes (Figure 32, detail 2).
Protective Earthing
For protection of personnel the metal housing of the ISM
must be connected according to the applicable regulations,
such as NFPA-70, via the marked earth screw of the ISM to
the earth arrangement of the particular panel. The earth
connection can be carried out with cable or a flat copper bar.
The cross section must be dimensioned such that a worst-case
fault current (short circuit) does not cause a weakening of the
earth connection (Figure 31).
Reference values for cross sections of earth
connections (copper):
Fault
current(1 s)
Max. tempe-
rature
Cross section
earth connection
16 kA 300 °C 55-95 mm²
20 kA 300 °C 70-120 mm²
The area around the earth screw shall be cleaned before providing the earth connections. After the occurrence of a
short circuit, the proper condition of the protective earthing must be checked.
Figure 31
Bolt M12x25
Lock washer
Washer
XT1 XT2
50-70 Nm
6
M6
OFF
ON
B
44 °
+1.5
-6
°
°
22°
2 Settings
OF F
Stroke
ON
2
+2.5
-1.5
5 29
+1
-4
M
10
2 Dettings
68 ° B-B
8
OFF ON
°
22°
44°
+1.5
-6
°
M6
8
Figure 32
Mechanical interlocking
Detail 3
Detail 2
Detail 1
Detail 1
Detail 2
Detail 3
3