3.1 Mounting and Connections
395
7SA522 Manual
C53000-G1176-C155-3
Figure 3-16 Installation example of a unit in a rack or cubicle (housing size
1
/
1
)
3.1.3.3 Panel Surface Mounting
For mounting proceed as follows:
• Secure the device to the panel with four screws. For dimensions see the Technical
Data in Section 4.23.
• Connect the earth of the device to the protective earth of the panel. The cross-sec-
tional area of the earth wire must be equal to the cross-sectional area of any other
control conductor connected to the device. The cross-section of the earth wire must
be at least 2.5 mm
2
.
• Connect solid, low-impedance operational earthing (cross-sectional area ≥ 2.5
mm
2
) to the earthing surface on the side. Use at least one M4 screw for the device
earth.
• Connections according to the circuit diagram via screw terminals, connections for
optical fibres and electrical communication modules via the inclined housings.
Specifications regarding maximum cross sections, tightening torques, bending radii
and tension relief as specified in the SIPROTEC
®
4 System Description (Order no.
E50417-H1176-C151) must be observed. You will find hints in the short description
included in the device.
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