Standard efficiency electric motors,high efficiency and premium efficiency motors all adopt Class F insulation system with Class B temperature rise,which is universal globally。

Class F insulation system with Class B temperature rise allow 25℃Temperature margin for high efficiency energy saving electric motors.It can increase the load within limited period，and allow the electric motors running at higher temperature and altitude,as well as running under bigger voltage and frequency tolerance.It can prolong the operation lifetime of the electric motors。

Class F insulation system：

The highest ambient temperature 40℃

The highest temperature rise is105K

Top temperature rise margin is+10K

class Btemperaturerise

The highestambient temperature 40℃

The highest temperature rise is 80K

Toptemperature rise margin is+10K

Imsulation systemclases：

ClassF155℃

Class B130℃

ClassH180℃

Grounding System

Earth screw（Ф?）		Terminal box earth screw（Ф）	Earth cable diameter（mm2）
71-112	M4	M4	1.5
132	M5	M5	205
200-250	M6	M6	16
280-315	M10	2×M10	25
355-400	M10	2×M10	45
450	M12	4×M12	50

1.If the sectional area of phase line is smaller than 25mm 2，it is the same size as the same phase line。

2.If the sectional area of phase line is 25-50 mm2，it is 25mm2。

3.If the sectional area of phase line is bigger than 50 mm2，it is half of the phase line。