Siemens SCALANCE X-300 Manual page 109

Grounding
PE connection with X-300EEC and XR-300EEC
Grounding simply via the housing is inadequate. For safe operation, the protective ground
must be connected to the grounding bolts.
On the SCALANCE X-300EEC, the PE connector is on the bottom of the device. On the
SCALANCE XR-300M EEC, the PE connector is on the rear of the device between the
power connectors.
19" rack mounting
19" rack mounting is possible for all rack devices identified by (XR).
Refer to the technical specifications, Installation options table for each product group. The
rack device (R) is installed using two mounting brackets fitted to the front. After fitting the two
mounting brackets, the rack device can then be installed in a 19" cabinet.
CAUTION
Do not cover the ventilation grilles
During installation, select a mounting position so that the ventilation grilles are always free
to achieve adequate cooling. In the standard position, the ventilation grilles are on the top,
bottom and sides of the housing.
If you install more than one rack device, make sure that the permitted ambient conditions
are met for all devices in the rack.
CAUTION
Four-point mounting
If mechanical load is high, the device should be secured at four points. You will find more
detailed information in the section "Mechanical stability in operation".
SCALANCE X-300
Operating Instructions, 10/2010, A5E01113043-10
WARNING
Installation
5.2 Installing a switch
109