4.4 Three-phase pumps, 20-30 hp
DANGER
Electric shock
Death or serious personal injury
‐ 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.
DANGER
Electric shock
Death or serious personal injury
‐ 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
Hot surface
Death or serious personal injury
‐ The surface of the terminal box may be above 158 °F
(70 °C) when the pump is operating.
4.4.1 Preparation
Before connecting the E-pump to the power supply, take the issues
illustrated in the figure below into consideration.
TM083398
Power supply-connected pump with power switch, backup
fuses and protective grounding
4.4.2 Protection against electric shock - indirect contact
DANGER
Electric Shock
Death or serious personal injury
‐ The pump must be grounded in accordance with
national regulations.
‐ As the leakage current of 20-30 hp motors is > 10 mA,
take extra precautions when grounding these motors.
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 (7 AWG minimum copper)
TM043021
Connection of a single protective ground lead using one of the
leads of a 4-core power cable (7 AWG 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.
TM038606
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.
4.4.3
Backup fuses
For recommended fuse sizes, see the section on supply voltage.
Related information
9.1.1 Supply voltage
9.1.1 Tension d'alimentation
9.1.1 Tensión de alimentación
4.4.4
Additional protection
The total leakage current of all the electrical equipment in the
installation must be taken into account.
For leakage current of the motor in normal operation, see the
section on leakage current.
During start and at asymmetrical supply systems, the leakage
current can be higher than normal.
Related information
9.1.3 Leakage current
7
English (US)
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