
Connecting up
6.1 Lightning protection, power supply and grounding
SCALANCE W786-x
Operating Instructions, 11/2014, A5E03678337-07
35
Grounding
NOTICE
Damage to the device due to potential differences
To fully eliminate the influence of electromagnetic interference, the device must be
grounded. There must be no potential difference between the following parts, otherwise the
device or other connected device could be severely damaged:
•
Housing of the SCALANCE W700 and the ground potential of the antenna.
•
Housing of the SCALANCE W700 and the ground potential of a device connected over
Ethernet.
•
Housing of the SCALANCE W700 and the shield contact of the connected Ethernet
cable.
Connect both grounds to the same foundation earth or use an equipotential bonding cable.
If it is used outdoors, the device must always be connected to protective earth.
Notice for USA/Canada (UL Requirements)
When an external antenna or the device itself is located outdoor:
- The Ethernet-Port (RJ45) is considered a TNV-1 circuit (according IEC 60950-1).
Connected Ethernet circuits must fulfill TNV-1 requirements (SELV circuits are not sufficient).
- The device must be properly earthed at the chassis earthing terminal.
- The 12 – 24 V power supply lines of the device are considered a TNV-1 circuit. Connected
power supply circuits must fulfill TNV-1 requirements. The PS791-2AC power supply may be
connected directly to 100 – 240 C AC primary circuits. The 100 – 240 AC wiring system must
be conducted to conduits. This wiring system (including conduits) shall be secured before
installation of the product, for example by using an outlet box, according to NEC or CEC.
When the device is located indoor:
- The Ethernet Port (RJ45) is considered a SELV circuit (according IEC 60950-1). All
connected Ethernet circuits must fulfill SELV requirements and shall be entirely contained
within a single low-voltage power distribution and within a single building.
- Do not connect any external LAN-circuit, powersupply or antenna coming from outdoor.
WARNING
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.