Computer grounding. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Grounding. Computer grounding. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Grounding and grounding

What is it for computer ground? A computer without it is quite functional and, as a rule, successfully performs the tasks assigned to it by the user. But there are a number of small nuances (Fig. 14.1).

Computer grounding
Rice. 14.1. Computer power supply

In most computer power supplies, there is an elementary filter at the input, consisting of two capacitors. Its task is to ensure that the high-frequency component is not missed. The filter may be more advanced, including inductors (depending on the "seriousness" of the PSU manufacturer), but, in most cases, this is the filter shown in fig. 14.1.

As a result, depending on the capacitance of the capacitors, we get a potential of about 100 V on the computer case relative to phase (L) and zero (N) wires. In other words, under certain conditions, if you touch the computer case, you can get an electric shock.

In rooms where the network is wired according to a three-phase scheme, the situation is much worse: the potential difference between the cases of computers sitting on different phases will already go to hundreds of volts. As a result, when combining computers, for example, in a network, we are almost guaranteed to get hardware damage.

Author: Koryakin-Chernyak S.L.

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