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6.3 Three-phase pumps, 15 - 30 Hp

6.3.1 Preparation

Before connecting the E-pump to the power supply, take the
issues illustrated in the figure below into consideration.

Fig. 8

Power supply-connected pump with power switch,
backup fuses, additional protection and protective
grounding

6.3.2 Protection against electric shock - indirect contact

EN 61800-5-1 specifies that the pump must be stationary and
installed permanently when the leakage current is > 10 mA.
One of the following requirements must be fulfilled:
• A single protective ground lead (7AWG minimum copper)

Fig. 9

Connection of a single protective ground lead using
one of the leads of a 4-core power cable
(7AWG minimum)

• Two protective ground leads of the same cross-sectional area

as the power supply leads, with one lead connected to an
additional ground terminal in the terminal box.

Fig. 10

Connection of two protective ground leads using two of
the leads of a 5-core power supply cable

Protective ground leads must always have a yellow/green (PE) or
yellow/green/blue (PEN) color marking.

6.3.3 Backup fuses

For recommended fuse sizes, see section

23.1 Supply voltage

page 33.

6.3.4 Additional protection

If the pump is connected to an electric installation where an
ground leakage circuit breaker (ELCB) is used as additional
protection, the circuit breaker must be of a type marked with the
following symbols:

This circuit breaker is

type B.

The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the motor in normal operation can be seen
in section

23.3 Leakage current

During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.

6.3.5 Motor protection

The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).

6.3.6 Protection against voltage transients

The pump is protected against voltage transients in accordance
with EN 61800-3 and is capable of withstanding a VDE 0160
pulse.
The pump has a replaceable varistor which is part of the transient
protection.
Over time this varistor will be worn and need to be replaced.
When the time for replacement has come, R100 and
PC Tool E-products will indicate this as a warning.
See section

20. Maintenance and service

on page 31.

6.3.7 Supply voltage and mains

3 x 380-480 V - 10 %/+ 10 %, 50/60 Hz, PE.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor is suitable for the power
supply of the installation site.
The wires in the terminal box must be as short as possible.
Excepted from this is the protective ground lead which must be so
long that it is the last one to be disconnected in case the cable is
inadvertently pulled out of the cable entry.

Warning

The user or the installer is responsible for the
installation of correct grounding and protection
according to current national and local
standards. All operations must be carried out by
qualified personnel.

Warning

Never make any connections in the pump
terminal box unless all electric supply circuits
have been switched off for at least 5 minutes.

Note for instance that the signal relay may be
connected to an external supply which is still
connected when the power supply is
disconnected.

Warning

The surface of the terminal box may be above
158°F (70 °C) when the pump is operating.

Warning

The pump must be grounded in accordance with
national regulations.

As the leakage current of 15 - 30 Hp motors is
> 10 mA, take extra precautions when grounding
these motors.

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ELCB