Connecting
6.3 Connecting the grounding
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
127
6.3.2 Grounding of the X-300EEC
Functional ground
With the devices X-300EEC and XR-300M EEC with a 100 to 240 VAC / 60 to 250 VDC
power supply, functional ground must be connected to the grounding bolts or the power
supply terminal of every power supply unit. With the devices X-300EEC and XR-300M EEC
with 24 to 48 VDC, functional ground must be connected to the grounding bolts or the
mounting brackets (XR-300M EEC). On the X-300EEC, the functional ground is on the
bottom of the device, on the XR-300M-EEC on the side.
To wire up the functional ground, use a copper cable of category 18-8 AWG or cable with a
cross-section of 0.75 to 6 mm².
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.
CAUTION
Connecting the protective ground
When operating with the multirange power supply unit 100 to 240 VAC / 60 to 250 VDC, it
is essential that you connect the main protective conductor via the grounding bolt on the
bottom or side of the device.
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.
Grounding bolts on the underside of the housing of the X-300EEC or on the rear of the XR-
300M-EEC
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