Siemens SIPROTEC 6MD665, Manual

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3 Installation and Commissioning
108
6MD665 Manual
C53000-G1876-C103-3
must be equal to the cross-sectional area of any other control conductor connected
to the device. The cross-section of the ground wire must be at least 2.5 mm
2
.
• Connections are realized via the plug terminals or screw terminals on the rear side
of the device according to the circuit diagram. When using forked lugs for direct con-
nections or screw terminal, the screws, before having inserted the lugs and wires,
must be tightened in such a way that the screw heads are even with the terminal
block. A ring lug must be centred in the connection chamber, in such a way that the
screw thread fits in the hole of the lug. Section /1/ has pertinent information regard-
ing wire size, lugs, bending radii, etc.
Figure 3-9 Panel flush mounting of a 6MD665
3.1.3.2 Rack Mounting and Cabinet Mounting
To install the device in a frame or cubicle, two mounting brackets are required. The
order numbers can be found in the Appendix.
• Loosely screw the two mounting brackets in the rack or cubicle with four screws.
• Remove the 4 covers on the corners of the front plate. This exposes the 4 elongated
holes in the mounting bracket.
• Tighten the unit with 4 screws at the angle brackets.
• Reinstall the 4 covers.
• Tighten the mounting brackets to the rack or cubicle using eight screws.
• Connect the ground on the rear plate of the device to the protective ground of the
panel. Using at least one M4 screw. The cross-sectional area of the ground wire