4.5. Grounding and overvoltage protection
The proper grounding together with surge protection components should be installed on site to increase
the resiliency of the whole installation against natural overvoltage situations (stimulated by storms,
lightning and other atmospheric issues). Such a system has to respect local standards for grounding
and electromagnetic protection, otherwise the risk of damaging the unit and/or connected IT infrastructure
gets much higher. We also recommend to consult each site situation with local experts to ensure the
installed grounding is enough for the actual site conditions and that the overvoltage protection of
sensitive components or infrastructures is reasonably effective against typical situations on site.
The rule is that every metallic component of wireless infrastructure located outside the building (in
LPZ0) should be properly grounded and protected against overvoltage, especially:
• grounded RAy unit itself (as described in
Section 4.3.3, “RAy unit grounding”
)
• grounded all shields from all metallic Ethernet cables
• grounded all DC cables (shields or one wire)
• overvoltage protection is applied on all metallic Ethernet cables at the point of entrance to the building
• overvoltage protection is applied on DC cable at the point of entrance to the building
All types of cables should be grounded and longer cables should be grounded in several places (outside
the building every few meters). Overvoltage protective devices are available for all types of cables and
usage. Accessories offered by RACOM for those purposes are listed in
of RAy
web site.
Important
The unit and mast must be properly grounded before the power supply and/or the user network
are connected to RAy unit.
Warranty does not apply for units destroyed by surges or over-voltage (see RACOM warranty
conditions at
).
Note
Some PoE power sources, PoE injectors and DC power supplies have overvoltage / surge
protection built in. Please consult the datasheets of those versus the local standards and site
requirements.
On sensitive sites additional overvoltage protection should / could be applied between different
zones (or rooms) even within one building (for example between network center and datacenter).
LPZ acronym means Lightning Protection Zone.
The example and rules below are designed in accordance with regulation EN 62305.
1. Where it is possible, the antenna should be located in an LPZ 0B protection zone with the use of a
local or artificial air termination device for protection against direct lightning strikes.
2. When meeting conditions for ensuring electrical insulation (distance from the lightning conductor)
in accordance with article 6.3 of this standard, it is not recommended to ground the load-bearing
structure and antenna to the external air termination network. Grounding should be attached to the
protective system of the internal LV (Low Voltage) wiring or grounded internal structures using a
CYA 6 mm
2
bonding conductor , see
Fig. 4.20 Grounding installation 1
.
36
https://www.racom.eu/eng/products/microwave-link.html#accessories_zemneni
RAy3 Microwave Link – © RACOM s.r.o.
64
Installation
Summary of Contents for RAy3-11
Page 2: ......
