Electricity is characterized by "invisible, invisible, inaudible, indistinct, indistinct". If the structure or installation of electrical equipment is imperfect, or improperly held, it will cause electric shock, affect production, and endanger personal safety. Electricity is the most convenient and widely used energy source, and it has become an important part of the production and life of contemporary people. However, in the use process, due to lack of knowledge of electricity safety and lack of safety protection measures, or due to lack of word management and improper operation and maintenance, electricity will also bring us harm. Therefore, it is very important to ensure the safety of electricity use. Strict implementation of relevant safety regulations should ensure correct installation, proper use, timely maintenance, and thorough disassembly to prevent accidents.
1. Safety voltage limit and rated value
(1) Limit
The limit is the highest voltage value that cannot occur between any two conductors under any operating conditions. my country's standards stipulate that the effective value of power frequency voltage is limited to 50V and that of DC voltage is 120V. Under normal circumstances, the allowable current of the human body can be considered as getting rid of the current; in the case of a quick-break holding device to prevent electric shock, the allowable current of the human body can be determined under the conditions of 30mA and human body resistance 1700Ω.
(2) Rated value
my country stipulates that the rated values of the effective value of the power frequency are 42V, 36V, 24V and 6V. Hand-held electric tools used in a particularly dangerous environment should use a safety voltage of 42V; hand-held lighting and local lighting used in an environment with a risk of electric shock should use a safety voltage of 36V and 24V; in a metal container, in a particularly humid place, etc. The hand-held lighting used should adopt a safe voltage of 12V; a safe voltage of 6V should be adopted in places such as underwater operations. When electrical equipment uses a safe voltage above 24V, protective measures must be taken against direct electric shock.
2. Basic requirements for electricity safety
(1) Do not move electrical equipment casually. If the electrical part fails and cannot be operated with illness, please call an electrician for repair immediately.
(2) The distribution boxes, switchboards, knife switches, button switches, sockets, plugs, and wires that you frequently contact and private must be kept in good condition.
(3) When operating the knife switch and magnetic switch, the cover must be properly covered to prevent the occurrence of an electric arc or fuse blown splash in case of a short circuit and hurt people.
(4) The electrical equipment used and its shell shall be grounded or zeroed protectively in accordance with relevant safety regulations. The facilities for grounding or zeroing should be checked frequently to ensure the connection is firm.
(5) When it is necessary to move certain non-fixed installation electrical equipment, such as electric fans, lighting lamps, electric welding machines, etc., the power must be cut off before moving. At the same time, the wire must not be dragged around on the ground to avoid wear. If the wire is pressed by an object, do not pull it hard to prevent it from breaking.
(6) The running lights used should have good insulated handles and metal lampshades. The metal socket of the bulb must not be exposed. The voltage of running lights should generally not exceed 36V. In particularly dangerous places, such as boilers, metal containers, small cabins, and wet trenches, the voltage should not exceed 12V.
(7) Under normal circumstances, temporary lines are prohibited. If it must be used, it should be approved by the relevant department. At the same time, the temporary line should be hung up in accordance with relevant requirements, and it is not allowed to drag it anywhere, and should be removed in time after use.

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