## 3.4 Grounding the Equipment

First connect the PGND to the grounding lug of the rack and then connect the grounding lug to the grounding bar of the equipment room.

(1) Precautions

l Determine the sectional area of the grounding wire according to the possible maximum current, and use cables of the good conductor.

l Do not use bare wires.

l The grounding electric resistance should be less than 1 Ω.

Figure3-5 Grounding Installation

Caution

l To guarantee the security of the body and the device, the switch must be well-grounded. The grounding resistance for combined grounding should be less than 1 Ω.

l The maintenance personnel must check whether the AC socket powering the switch is well connected to the building protective earth (PE). If not, the personnel must connect the grounding lug of the AC socket to the PE with a grounding connector.

l The AC socket must be installed near the device and easily used.

l When installing the switch, ensure that the grounding is connected first and then disconnected.