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When considering the earthing, you need to think about two aspects: The first is the system compatibility,
and the other is the external interference coupling into the earth circuit, which results in system error. For
the external interference is not regular, it is not easy to resolve.
3. Thunder proof ground method in the monitor system
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The monitor system shall have sound thunder proof earthing to guarantee personnel safety and
device safety.
⚫
The monitor system working ground resistance shall be less than 1Ω.
⚫
The thunder proof ground shall adopt the special ground cable from the monitor control room to the
ground object. The ground cable adopts copper insulation cable or wire and its ground section shall
be more than 20mm2.
⚫
The ground cable of the monitor system cannot short circuit or mixed connected with the strong
alternative current cable.
⚫
For all the ground cables from the control room to the monitor system or ground cable of other
monitor devices, please use the copper resistance soft cable and its section shall be more than
4mm2.
⚫
The monitor system usually can adopt the one-point ground.
⚫
Please connect the ground end of 3-pin socket in the monitor system to the ground port of the
system (protection ground cable)
4. The shortcut way to check the electric system using the digital multimeter
For 220V AC socket, from the top to the bottom, E (ground cable), N (neutral cable), L(live cable). Please
refer to the following figure.
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