HIKVISION ADS-24S-12 1224GPCN Quick Start Manual page 45

Video Intercom Main Unit·Quick Start Guide
Figure 3-46 Chisel Screw Hole
4. Remove the stickers and insert the expansion sleeves into the screw holes.
5. Thread the module-connecting line (400 mm) and grounding line across the thread
hole of both frames.
Figure 3-47 Place the Grounding Line and Module-Connecting Line
 There are 6 module-connecting lines in the package: 190 mm *4 and 400 mm*2.
 Take the 400 mm one for this step.
 The green-yellow line in the package is for grounding.
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