English (GB)
11
Electrical connection
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. It must
be possible to lock the
main switch in position
0. The electrical
connection must
comply with local
regulations.
The pump must not run dry. Dry running
may cause ignition hazard.
Install an independent secondary level
switch to the same level to ensure that the
pump is stopped in case the primary stop
level switch is not working.
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the free
end of the power cable in potentially
explosive environments.
The classification of the installation site
must be approved by the local fire-fighting
authorities.
On explosion-proof pumps, make sure that
an external earth conductor is connected
to the external earth terminal on the pump
using 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
, for example type
H07 V2-K (PVT 90 °) yellow and 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. They must be
connected to the Grundfos LC 231 or LC
241 pump controller through the
intrinsically safe 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, its
service agent or
similarly qualified
persons.
If the pump has an Ex mark on the
nameplate, make sure that the pump is
connected in accordance with the
instructions given in this booklet.
Before installation and the first startup of
the pump, check the condition of the cable
to avoid short circuits.
