Grounding Of The Rack Devices - Siemens SCALANCE X-300 Series Operating Instructions Manual

Protective ground
When the device is operated with multirange power supply unit 100 to 240 VAC / 60 to 250
VDC, the protective ground is connected in addition to the functional ground.
Danger from line voltage
Grounding simply via the housing is inadequate.
In this case, connect the functional ground to ensure reliable operation.
With devices with a supply voltage of 100 to 240 VAC / 60 to 250 VDC, you should also
connect the protective earth to the grounding bolt.
To wire up the protective ground, use a copper cable of category 14-8 AWG or cable with a
cross-section of 1.5 to 6 mm².
6.5.1.1

Grounding of the rack devices

Grounding options
Grounding (functional ground) is via the mounting bracket on the device or via the bolts on the
rear of the device.
Position
The connector for the grounding cable is in the center of the rear panel of the device, see
section "Graphics (Page 221)".
Grounding is via a screw-in or a pressed in grounding bolt, see section "Product overview
(Page 31)".
Fitting screw in grounding bolts
①
②
To fit the screw-in grounding bolts, follow the steps below:
1. Thread the toothed washer
2. Screw in the grounding bolt
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24
CAUTION
1
2
Toothed washer
Grounding bolt
①
onto the bolt.
②
with a maximum tightening torque of 2 Nm.
Connecting
6.5 Grounding
125