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Talk about the selection of BOSO electric tools
In general occasions, class II BOSO power tools should be selected; the outstanding two-layer edge or additional edge of the BOSO power tool body is a safe and reliable method to prevent electric shock. Assuming the use of class I BOSO power tools, it is necessary to use a leakage protector or a safe isolation transformer to supply power; otherwise, the user must wear gloves or stand on a mat.
When working in wet places or on metal structures, BOSO power tools of class II or III should be used. Assuming the use of class I BOSO electric tools, it is necessary to install a leakage protector with a rated operating current of not more than 30mA and an operating time of not more than 0.1s.
Class III BOSO power tools should be used in narrow places (such as in boilers and metal containers). Assuming the use of class II BOSO electric tools, it is necessary to install a leakage protector with a rated leakage current of not more than 15mA and an operating time of not more than 0.1s. In addition, the safety isolation transformer, control box, power connector, etc. of class III BOSO power tools and the leakage protector of class II BOSO power tools must be placed outside and supervised by special personnel. In such occasions, prohibit the use of Class I BOSO power tools.
In exceptional environments, such as hot and humid, rain and snow, explosive or corrosive gas occasions, the hand-held electric BOSO power tools used must also meet the special safety requirements of the corresponding environment.
Protective connection of Ⅰ BOSO electric tools
As mentioned before, BOSO power tools of class I rely on the base to protect the zero (ground) to prevent electric shock. When using BOSO power tools with a protective zero connection, the protective zero line should be separated from the working zero line, that is, the protection zero line should be independently connected to the repeated grounding of the power grid. In order to connect to zero reliably, it is best to use a copper core rubber sheathed flexible cable with a zero core wire as the power cord, and its special core wire is used as the zero wire. The protective zero line should be a copper wire with a cross-sectional area not less than 1.5mm2. The power sockets and plugs used by BOSO electric tools should have special zero-connection jacks and plugs. They should not be inserted randomly to prevent the neutral line from being inserted into the phase line to cause electric shock.
It should be pointed out that, of course, the zero protection method is adopted, and the hand-held electric BOSO power tool may still have the risk of electric shock. This is because the single-phase lines are widely spread, and the phase and neutral lines are simple and thick. At this time, the phase and neutral lines are generally equipped with fuses. The neutral line fuse is blown, and the phase line fuse is not blown, it may be possible Make the equipment casing present a voltage to ground to become an electric shock incident. Therefore, this zero connection cannot ensure safety, and other safety methods must be selected.