Hand-held power tools (hereinafter referred to as the tools) use rise very convenient, in the industry and agriculture production site construction, mine is widely used. However, because in the process of operation to hold in the hand of the users, so, once shell charged, current will through the human body, causes dangerous consequences of an electric shock. Therefore, using handheld electric tools should double pay attention to the following ten safety problems.
Soft line or cable tools of safety requirements:
1. Ⅰ kind of power tools must be of the three core (single tool) or four core (three-phase tools) more shares TongXin rubber sheath soft cable or sheath soft line. Among them, the green/yellow double color line in any case can only be used for protection of ground zero line or to accept.
2. The tools of soft cable or soft line arbitrarily pick long or systems.
3. Tools to plug, plug safety requirements:
The plug and socket used tools must comply with the relevant national standards. With the plug sockets, ground pins, in compliance with regulations should be inserted timeliness of contact order,glue gun prevent mistakenly inserted. Tools or soft soft cable line to dismantle the plug or change.
Three hole electrical outlet grounding jack should be used alone wires connected to the ground wire (the protection of ground) alone or with wires connected to meet the zero line (the protection of zero take) shall not be in the socket with wires directly to the ground zero line line up.
A, according to the use of the environment selection tool type. Handheld electric tool classification method are many, according to the different methods of electric shock protection is divided into three kinds, namely Ⅰ, Ⅱ and Ⅲ three categories. In general place, to ensure the safety of the user, should choose Ⅱ kind of tools. Ⅱ kind of tool itself good double insulation, which can effectively prevent to get an electric shock accidents. In damp places or metal structure homework, should choose Ⅱ class or Ⅲ kind of tools. In a narrow place (such as boiler, metal container) should be used Ⅲ kind of tools. In the special environment, such as hot and humid, rain and snow, explosive or corrosive gas, site of the use of handheld electric tool also must meet the corresponding environmental special safety requirements.
Second, long delayed or damp tools before use to measuring insulation resistance. For the long-term delayed or damp tools before use by electrical measuring insulation resistance should be, look to whether meet the requirements. The insulation resistance requirements are: Ⅰ kind of not less than 2 ohms for-volt ac; Ⅱ kind of not less than 7 ohms for-volt ac; Ⅲ kind of not less than 1 ohms for-volt ac.
Three, before each use for appearance and electrical inspection. Inspection including: shell, the handle for cracks and damage, fasteners are complete effective; Soft cable or soft wire are intact,glue stick protection by zero (ground) is correct, strong, plugs are in good condition; Switch action is normal, flexible, and in good condition; Electrical protection device and mechanical protection devices are in good condition; Tools rotational part is flexible barrier-free, card head whether firmly, etc.
Electrical tests: after electrify reaction normal, switch control is effective; After the power supply by ShiDianBi inspections should not shell leakage; The signal indicates to the right, automatic control function normal; For rotating tool, after electrify should observe brush sparks and voice is normal or not.
Four, tools and power connections comply with requirements. The power tools must be of the stream TongXin rubber soft cable or sheathed cable, and the middle can not have joint, shall not take any long or systems; Tools original plug may not arbitrarily removed or change, when the power supply and the work place distance is farther should be used when moving the switch box solution. It is strictly prohibited to need not plug directly the wire wire into socket.