Ziton ZP3, Руководство по установке и обслуживанию

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Appendix A: ZP wiring guide
ZP3 Fire Control Panel Installation, Commissioning, and Maintenance Manual 119
The panel is typically located in a building, which allows only limited earth
options. The following are the preferred rules that should be followed if possible.
Normally the panel is connected to the nearest external earth point. This external
earth point may vary in quality, from a high quality instrumentation earth to the
earth used by the electrical network. This external earth point is in turn connected
to the main building earth system.
The earth connection should preferably meet the following criteria:
• It should be a clean earth, preferably not shared with other electrical devices.
High-energy equipment should be connected to an earth point that is as close
as possible to true earth.
• Wiring codes normally require it to be bonded to the main building earth for
safety reasons.
• The resistance to true earth should be as low as possible.
See Figure 55 for a typical panel earth connection.
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1 2
3
4
5
6
7
8
9
1. Power supply
2. Panel
3. ZP loop
4. Common earth point at panel
5. Wire from panel to earth point 6. External earth point
7. Existing wire from earth point to main
building earth
8. Main building earth
9. High energy equipment
The wire from the panel to the external earth point should be at least 4 mm²
cable and be securely connected at both ends to ensure a good mechanical and
electrical connection. Use crimped lugs where possible.
If any loop device makes use of separate external power i.e. is not powered from
the ZP loop, then the earth connections must follow the guidelines below:
• The ZP loop shield must be connected to panel earth at the panel.