HIKVISION DS-2CD3021G0-I Quick Start Manual page 20

Network Bullet Camera·Quick Start Guide
2. Drill the screw holes in the ceiling according to the supplied drill
template.
Note:
Drill the cable hole, if adopting ceiling outlet to route the cable.
3. Route the cables through the cable hole (optional), or the side
opening.
4. Fix the camera on the ceiling with supplied screws.
Figure 2-3 Fix the Camera on the Ceiling
Figure 2-2 The Drill Template
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