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Affiliate power tools manufacturer , Sichuan Ben small share knowledge with you [2014-11-22]

Portable electric machines and hand-held power tools must use single-
 
phase power line three core soft rubber cable , three-phase four core 
 
rubber cable, power cord must usedWire, cable sheathing should wear to 
 
the junction box and fixtures .
2 , power tools should be checked before using the following matters:
 
(1 ) shell, handle no cracks, no injury;
 
(2 ) to protect the ground line or zero line connected correctly and 
 
firmly ;
 
(3 ) cable or rope in good condition;
 
( 4 ) is inserted in good condition ;
 
(5) Switch action is normal, flexible , and no defects;
 
(6 ) Electrical protective devices are in good condition ;
 
(7 ) mechanical protection devices are in good condition ;
 
 
3 , power tools, insulation resistance should always use 500 v 
 
Megaohmmeter measurements, such as the insulation resistance between 
 
live parts and enclosure reach 2 m Ω must repair process .
 
4, after the electric tool motor parts repair, you must conduct stress 
 
tests , measure the insulation resistance and insulation test voltage 
 
of 380 v, test time is 1 minute .
 
5, the connection circuit of electrical machinery and tools should be 
 
set individually switch or outlet, and provide leakage current 
 
protection , metal shell ; prohibited the brakes after a variety of 
 
devices

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