Definition Of Explosion-Proof Protection; Equipotential Bonding - FLUX GS Notice D'instructions

4.2.1

Definition of explosion-proof protection:

> Attention!
 The drive motor (electrically driven or with compressed air) must not
Category 1 (ZONE 0): The external part of the pump between the pump suction end and its
outlet connection.
Category 2 (ZONE 1): The external part of the pump between its outlet and the connection
part to the drive motor / gear as well as the internal part of the pump. (During pumping, the
internal part of the pump will always be filled by the liquid).
4.3

Equipotential bonding

If the motors are operated together with the pump, comprehensive, clear equipotential
bonding is essential (earthing, Fig.1)
Pump/motor connection
Bearing flange or planetary
gear
2
Pump
Suction end
of the pump
Category 1 (Zone 0)
Category
Fig. 1: Earthing in hazardous locations
> Connect the earth continuity conductor (earth wire) (1) to the designated screw on the
explosion-proof motor.
> Connect the earth continuity conductor (earth wire) (2) to the designated screw on the
pump. For equipotential bonding, an electrically conductive connection must be pro-
duced between the motor and the pump according to DIN EN 60079-0 and DIN EN
60079-14. If the connection between the motor and pump already provides a conduc-
tive path (for pumps for flammable liquids), one of the equipotential bonding conductors
may be dispensed with.
> The containers should be grounded separately (3), if they are not already grounded
by the mode of installation.
> The hose (4) connected with the pump must not exceed a resistance of 10
between the hose ends. Only use hose lines with conductive hose unions (see
TRbF 50 Annex B. (R < 10
hoses and fittings.
> Only use an explosion-proof plug or an explosion-proof terminal box when making
connections to the mains (5).
> Remove paint and dirt from all connection points of equipotential bonding conductors
and transition points of the containers to the electrically conductive base ground to
ensure good conductivity.
exceed the output power of 550 W.
2 (Zone 1): ambiance close to category 1
Ω). This will provide a conductive path for the pump,
6
Original operation instructions planetary gear
5
Drive motor
1
Pump outlet
4
Conductive hose
Ω
6
R < 10
3
3
6
Ohm
19/36