English (GB)
11
8. Electrical connection
Carry out the electrical connection according to local
regulations.
DANGER
Electric shock
Death or serious personal injury
- Connect the pump to an external main
switch which ensures all-pole
disconnection with a contact separation
according to EN 60204-1, 5.3.2.
- It must be possible to lock the main
switch in position 0. Type and
requirements as specified in EN 60204-
1, 5.3.2.
Connect the pumps to a control box with a
motor protection relay with IEC trip class
10 or 15.
Pumps to be installed in potentially
explosive locations must be connected to
a control box with a motor protection relay
with IEC trip class 10.
The permanent installation must be fitted
with an earth-leakage circuit breaker
(ELCB) with a tripping current lower than
30 mA.
Make sure there are at least 3 m free cable
above the maximum liquid level.
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the free
end of the power cable in potentially
explosive environments.
The explosion protection classification of
the pumps is CE Ex II 2 G, Ex d IIB T4. The
classification of the installation site must
be approved by the local fire-fighting
authorities in each individual case.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal on the pump
using a conductor with a secure cable
clamp. Clean the surface of the external
earth connection and mount the cable
clamp.
The cross section of the earth conductor
must be at least 4 mm
2
, e.g. type H07 V2-
K (PVT 90 °) yellow and green.
Make sure that the earth connection is
protected against corrosion.
Make sure that all protective equipment
has been connected correctly.
Float switches used in potentially
explosive environments must be approved
for this application. They must be
connected to the Grundfos LC, LCD 108
pump controller via the intrinsically safe
LC-Ex4 barrier to ensure a safe circuit.
DANGER
Electric shock
Death or serious personal injury
- If the supply cable is damaged, it must
be replaced by the manufacturer, his
service agent or a similarly qualified
person.
Set the motor-protective circuit breaker to
the rated current of the pump. The rated
current is stated on the pump nameplate.
Make sure that the pump is connected in
accordance with the instructions given in
this booklet.
