Equipotential Bonding - FLUX F 550 Serie Notice D'instructions

5.3

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. 2: Earthing in hazardous locations
> Connect the equipotential bonding conductor (earth wire) (1) to the designated screw
on the explosion-proof motor.
> Connect the equipotential bonding conductor (earth wire) (2) to the designated screw
on the pump. For equipotential bonding, an electrically conductive connection must be
produced 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 conductive
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
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.
The electrically conductive base ground must be an integral part of the equipotential bond-
ing system.
If a conductive base ground is not available, equipotential bonding conductors must be
connected to all barrels and containers.
Note
Explosion protection at the connection point is not necessary if
the power socket or the terminal box is clearly located outside the
hazardous area.
Original operating instructions Eccentric worm drive pump F 550 and Sanitary pump F 560
2 (Zone 1): ambiance close to category 1
Ω). This will provide a conductive path for the pump, hoses and
6
5
Drive motor
1
Pump outlet
4
Conductive hose
Ω
R < 10 6
3
3
6
Ohm
39/88