1, high pressure, low pressure, safe voltage how to differentiate?

Voltage to earth in 250 v above for high pressure, voltage to earth in 250 v for low voltage, voltage to ground less than forty v for safe voltage. In our country is often used to 36 v and 24 v and 12 v for safe voltage.

2, get an electric shock accident type is divided into how?

(1) the single-phase electric shock, refers to the human body on the ground or other grounding conductor, a part of human body touch a phase of the electric shock accident;

(2) the two phase electric shock, refers to the human body in two at the same time two phase charged body touch the electric shock accident, its harmfulness is compared commonly big,

(3) the step voltage electric shock, when charged body ground have defined the electricity, the current in the joint site in soil around produce voltage drop, the human body in the earth point around between two feet in voltage that is striding voltage, which cause electric shock accident that ?

3, get an electric shock accident prevention measures have?

(1) every because insulation failure and may have dangerous voltage electrical equipment and electrical installation of the metal shell and frame, have reliable grounding;

(2) all easy to be met electrical equipment should be a barrier, and hang warning card;

(3) often for electrical equipment for inspection, found that the temperature rise too high or insulation fault shall promptly report, timely treatment to avoid the equipment working in spite of illness;

(4) the operation of high voltage power supply, should use safety equipment. Such as operating bar, insulating rubber boot, etc.;

(5) repair electrical equipment should be cut off the electricity supply before, and hang out "some work no switching" notice board. Without listed person to agree, in any circumstances be closing or will notice board removal;

6 the use of lamp voltage shall not be more than 36 v, in metal containers or wet work (such as cleaning the pool of water, and water irrigation make lamp voltage shall not be more than 12 v);

7 judgment knife and insurance application protection screen protection, the fuse capacity must comply with the safety of the circuit current;
8 should maintain electrical equipment dry, not in electrical equipment nearby flush items;

9 when electrical fire put out, the application of electrical fire extinguisher, such as: carbon tetrachloride, carbon dioxide, dry powder fire extinguisher, etc.