DFA SqwidNET Visio Tamper Manuel d'installation - Page 8

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4. Device Installation

Fibre-reinforced Polymer Type

Step 1: Drilling preparation

Instructions:

1. Place the device with the bottom edge approximately 10mm

from the manhole lip.

2. Mark the position of the holes with a pencil or punch.

Fig. 4.1

Fig. 4.2

Step 2: Drilling

Instructions:

1. Mark a drill depth of 13mm on the drill bit (2mm diameter).

2. Drill the hole vertically into the manhole cover, taking care to

stop at the marked depth.

Fig. 4.3

Fig. 4.4