Protection Devices; Cable Inlets - WEG Ex d Manual De Instalación, Operación Y Mantenimiento

The accessory connector can be fixed in an accessory terminal box.
Frame Size: 160 to 200
As reported previously, connections must be made using clamping torques that matches screw size:
screw size
Clamping
Torque [n.m]
Minimum air distances, between conductors, specified by EN 60079-7 or IEC 60079-7 Standard:
Rated Voltage – U [V]
176 < U < 220
220 < U < 275
275 < U < 440
440 < U < 550
550 < U < 693
693 < U < 880
880 < U < 1100
2.3.3 PROTECTING DEVICES
Thermal Protector Device:
The type of protector used is thermistors (PTC – positive temperature coefficient).
Thermistors are semi-conductor heat detectors which sharply change their resistance upon reading a pre-set
temperature.
They are fitted into the winding and linked by a bushing line M10 x 1.5 (0.5 mm² cable) with a connector inside
the terminal box.
PTC / Winding
Connection
Winding

2.4 CABLE INLETS

They must be designed according to Installation and Type of Protection Standards specified in 2.1.
When cable inlets are provided with cable gland, this must be suitable to the unit and to the cable type; the
8 | INDUCTION MOTORS FOR HAZARDOUS AREAS
M4 M5
1.2 2
Minimum air - distance [mm]
Connector
Bushing line M10 x 1.5
Frame Size: 225 to 355
M6 M8
3 6
4
5
6
8
10
12
14
Protection Device Diagram
M10 M12
10 15.5
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