Grundfos LFE Instrucciones De Instalación Y Funcionamiento página 24

13.2.2 Protection against electric shock - indirect contact
DANGER
Electric shock
Death or serious personal injury
- Ensure the pump is grounded in accordance with
national regulations. As the leakage current of 5-
10 hp (4-7.5 kW) motors is > 3.5 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)
Fig. 13 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.
Fig. 14 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.
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13.2.3 Backup fuses
For recommended fuse sizes, see section
13.2.4 Additional protection
If the pump is connected to an electric installation where an
ground leakage circuit breaker (ELCB) is used as additional
protection, use a circuit breaker of a type marked with the
following symbols:
This circuit breaker is type B.
Take into account the total leakage current of all the electrical
equipment in the installation.
Check the leakage current of the motor in normal operation. See
section
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
13.2.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
13.2.6 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 become worn and will need to be
replaced. When the time comes for replacement, Grundfos GO,
R100 and PC Tool E-products will indicate this as a warning. See
section
ELCB
28.2.3 Leakage current.
27. Maintaining and servicing the
28.2.1 Supply voltage.
motor.