Terminal Box - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

For explosion-proof motors, the joints can be coated only with the following products:
Lumomoly PT/4 (Lumobras);
g
Molykote DC 33 (Dow Corning).
g
For other types of protection, apply Loctite 5923 (Henkel) on the joints.
Figure 8.2 - Machined surface of the terminal box of explosion-proof Motors.
For explosion-proof motors special care should be taken with the machined surfaces of the flame path. These
surfaces must be free of burrs, scratches, etc. that reduce the flame path length and increase the gap.
The gaps between terminal boxes and the respective terminal box covers should not exceed the values
specified in Table 8.7.
Table 8.7 - Maximum gap between terminal box and terminal box cover for explosion-proof enclosures.

8.3.1. Terminal box

Proceed as follows to remove the terminal box cover and to disconnect/connect the power supply cables and
the cables of the accessory devices:
Ensure that during the screw removal the terminal box cover does not damage the components installed
g
inside the terminal box.
If the terminal box cover is fitted with lifting eyebolt, lift the terminal box cover always by its lift eyebolt.
g
If motors are supplied with terminal blocks, ensure the correct tightening torque on the motor terminals as
g
specified in Table 8.7.
Ensure that the cables do not contact sharp edges.
g
Ensure that the original IP degree of protection is not changed and is maintained as indicate on the motor
g
nameplate. The power supply cables and the control cables must always be fitted with components (cable
glands, conduits) that meet the applicable standards and regulations of each country.
Ensure that the pressure relief device is in perfect operating condition, if provided. The seals in the terminal
g
box must be in perfect condition for reuse and must be reinstalled correctly to ensure the specified degree of
protection.
Ensure the correct tightening torque for the securing bolts of the terminal box cover as specified in Table 8.8.
g
Screw type and seal
Hex bolt/hex socket bolt
(without seal)
Combined slotted screw
(without seal)
Hex bolt/hex socket bolt
(with seal with metallic
stop/cord)
Combined slotted screw
(with flat seal and/or
mettallic stop/cord)
Hex bolt/hex socket bolt
(with flat seal)
Terminal blocks
Grounding terminals
Explosio-proof
Terminal
motors
box cover
Other types of
protection
Frame size
IEC 71 to 355
NEMA 143 to 586/7
Table 8.8 – Tightening torque for the securing bolts [Nm]
M4 M5 M6
- 4 to 7 7 to 12
- 3 to 5 5 to 10
- - -
- 3 to 5 4 to 8
- - -
1 to 1,5 1,5 to 4 3 to 6,5
- 3 to 5 5 to 10
- - -
- 3 to 5 4 to 8
Apply rust inhibitor on all
machined surfaces of the motors
with degree of protection higher
than IP55.
Flat joint Cylindrical joint
W21 W22X
0.05 mm 0.076 mm 0.158 mm
M8 M10
16 to 30 30 to 50 55 to 85
10 to 18 -
13 to 20 25 to 37 40 to 55
8 to 15 -
8 to 15 18 to 30 25 to 40
6 to 9 10 to 18 15,5 to 30
10 to 18 30 to 50 55 to 85
35 to 41 69 to 83 120 to 145
8 to 15 25 to 37 40 to 55
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W22X
M12 M16 M20
120 to 180 230 to 360
- - -
50 to 65 -
- - -
35 to 50 -
30 to 50 -
120 to 180 -
295 to 355 580 to 690
50 to 65 -
Manual of Electric Motors 117