Reliable power supply and grounding are paramount to the operation of appliances, computers, local area networks, peripheral devices, connect the various cables (e.g., computer, printer, TV-VCR, and in other cases). The use of protection devices, in particular, uninterruptible power supply (UPS) efficiently only in the presence of good grounding. The practical implementation of a reliable ground as relevant (from the point of view of protection, long-term use and safety) that is no less important than, say, the life and health of a person. Because these concepts are interrelated. How to securely ground the equipment — the theme of my article.
The ground connection in a single electrical circuit
Consider some of the features connect to a lighting network 220 V electric devices from the point of view of security of both people and devices.
Figure 1 shows a diagram of the network filter power (FP), used in almost every power supply home appliances of varying complexity (television, computer or peripheral devices).
Filter capacitors are designed to shunt high-frequency interference of the lighting network to the ground via the protective ground wire and the corresponding three-pole plug (plug) and socket. The ground wire is connected to the ground loop, it is unacceptable to connect with the “zero” of the lighting network. When the device of “the vanishing” is necessary to guarantee that a zero will not be a phase if someone “invert” DC power plug. If “ground” the device will not connect to the case (common wire) of the device may receive AC voltage of 100 V (Fig.2): filter capacitors operate as a capacitive voltage divider, and since the capacity is the same, 220 is divided in half.