LEGRAND NUMERIC HP i 33 40 kVA Series User Manual page 42

Step 5 Install 4 expansion bolts M12 into the installation holes. The structure and installation of the expansion
bolt is as shown in Figure 4-11.
Bolt
Nut
Spring gasket
Flat gasket
Expansion tube
Figure 4-11. Structure and installation of the expansion bolts
Note:
The exposed height of expansion bolt must be within 50 mm.
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1. Drill holes on the installation ground by hammer drill.
2. Tighten the expansion bolt mildly, and put it to the hole vertically,
and then knock the expansion bolt by rubber hammer till all the
expansion tubes fit into the holes.
3. Pre-tighten the expansion bolt.
4. Screw out the bolt, take down the spring gasket and flat gasket.
CAUTION
The expansion tube shouldn't be higher than the ground, so as to avoid affecting
the installation.