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6. ELECTRICAL CONNECTION
Attention: always respect the safety regulations!
Electrical installation must be carried out by an expert, authorised electrician, who takes on all
responsibility and respects the regulations in force.
The system must be correctly and safely earthed as required by the regulations in force.
The control panel and respective electrical equipment, when contemplated, must be of a type
approved by the safety regulations in force. Instruments and components of the panel must be of an
adequate capacity and quality to maintain reliable operation over time.
In potentially explosive environments, the electrical connection and the control panel must be
provided with explosion-proof protection.
The line voltage may change when the electropump is started. The line voltage may undergo
variations depending on other devices connected to it and on the quality of the line.
The pump must be connected to a device for isolating the power supply, complying with the
requirements specified in standard EN60204-1 paragraph 5.3.2.
The differential switch protecting the system must be correctly sized and must be of the “Class A” type.
The automatic differential switch must be marked with the following two symbols:
Before making the electrical connection, turn off the power and ensure that it cannot be
reconnected accidently. Connect the earth lead before connecting the line leads; if the
electropump has to be removed or dismantled, the earth lead must be removed last.
The installer is responsible for ensuring that the earthing system is efficient and made in
compliance with the regulations in force.
For explosion-proof pumps the electrical and equipotential connection must be made
according to standard EN 60079-14.
Before installation and the first start-up of the pump, check the condition of the cable visually
to avoid short circuits.
If the power cable is damaged, it must be replaced by the manufacturer’s service centre or by
another qualified person.
On explosion-proof pumps, make sure that an external earth conductor is connected to the
external earth terminal on the pump.
The section of the earth lead must be at least 4mm², yellow/green.
Make sure that the earth connection is protected from corrosion.
Make sure that all protective equipment has been connected correctly.
Float switches used in potentially explosive environments must be approved for this application.
Set the motor-protective circuit breaker to the rated current of the pump. The rated current is
stated on the pump nameplate.
The supply voltage and frequency are marked on the pump nameplate. The voltage tolerance must be within -
10 %/+ 10 % of the rated voltage. Make sure that the motor is suitable for the power supply available at the
installation site.
All the pumps are supplied with a 10 m cable and a free cable end.
For greater lengths contact the DAB Pumps technical assistance service.
The connections of the pump protection system, such as thermal protections and oil-in-water sensor, are to be
provided by the user, who must use a control panel with suitable characteristics.
