BASIC REMEDIES, being more secure installation.
General requirements.
Electrical safety is ensured by the following measures of protection:
appropriate, and in some cases increased (or double) insulation;
Unavailability of live parts, grounding of electrical enclosures and electrical items. That may be under stress, the potential equalization, fast and reliable automatic safety shutdown;
lowering the voltage to 42 V and below, the division of protective systems;
Warning alarm, slogans and placards, protective equipment and devices. In reviewing and selecting these protective measures should be borne in mind that none of them is not universal. Every security measure has inherent advantages and disadvantages, which impose certain limitations on its scope in each case, selected measures of protection under the given conditions are more efficient and reliable.
Danger of contact with live parts under voltage in the first place can be prevented by creating a reliable electrical insulation of electrical systems and keep it in good condition and adequate fencing.
HAZARD ungrounded equipment cabinets, find themselves under stress, may prevent the isolation of man from the housing directly or indirectly.
In some cases, resolution of this issue is reflected in the production of electrical equipment (such as power tools and household appliances), double insulated.
Sometimes it turns out to be an effective measure to protect ground shells, in which an electrical circuit in which the accident including the human body, is shunted by low resistance grounding device. The electric current passing almost human passes through the conductors in the earth grounding device. Current is distributed in this case inversely proportional to the resistance of the human body and resistance shunt.
In the operation of certain electrical for electrical safety is not enough of any single protection. Then apply two or more complementary protection (eg, grounding, and safety shutdown, grounding and potential equalization, etc.).