box lid, terminal box base, should pass the hydraulic pressure lest, with the pressure is
1.0MPa and lasted 1 minute.
b. The length of the junction plane for explosion-proof, the gap, the surface roughness, the
electric gas between the exposed conductors, between the exposed conductor and the
metal covering ,and the creeping distance ,please look at the drawing No.1、2.
c. There are spring washers under the bolts connect the outer covering parts, which can
prevent the bolts loosing.
d. The stator housing, end cover, the inner bearing cap, the terminal box, the terminal
block, the shaft, and the oil seal is the parts for the explosion–proof.
6.2 Under the worst status, the temperature of the surface of the motor should not surpass
+135℃. The factory should use the motor according to table 4.
Table 4
Type of explosive admixture T1 T2 T3 T4
Allowed temp rising of the surface (℃） 450 300 200 135
7. Install and use
7.1 Preparative before to install
7.1.1. The wrapping is good or not should be checked up before it open.
7.1.2. The dust and the anticorrosive things should be eliminated the motor are installed.
7.1.3. The steps should be done before install the motor.
a. There are a mark and a card number of explosion-proof with the motor. Please check
if it fulfillsthe demand of the using environment.
b. The bolts connecting the outer covering parts should not loose.
c. The parts of outer covering should have not crackled or disfigurements.
d. The grease must be enough, and the tools for grease are good.
e. The insulation resistance should not be lower than 0.38 MΩwhen the rated voltage is
380V and should not be lower than 0.66MΩwhen the rated voltage is 660V.
7.2 The electric motor uses the elastic shaft coupling transmission; the center of the motor
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