EHEIM classic 150 Mode D'emploi page 7

A "drip-loop", shown in the figure, should be arranged by the user for
each cord connecting an aquarium appliance to a receptacle.
The "drip-loop" is that part of the cord below the level of the recep-
tacle, or the connector if an extension cord is used, to prevent water
traveling along the cord and coming in contact with the receptacle.
If the plug or socket does get wet,
Disconnect the fuse or circuit breaker that supplies power to the ap-
pliance. Then unplug and examine for presence of water in the recept-
acle.
c) Close supervision is necessary when any appliance is used by or near
children.
d) To avoid injury, do not contact moving parts or hot parts such as
heaters, reflectors, lamp bulbs, and the like.
e) Always unplug an appliance from an outlet when not in use, before
putting on or taking off parts, and before cleaning. Never yank cord to
pull plug from outlet. Grasp the plug and pull to disconnect.
f) Do not use an appliance for other than intended use. The use of at-
tachments not recommended or sold by the appliance manufacturer
may cause an unsafe condition.
g) Do not install or store the appliances where it will be exposed to the
weather or to temperatures below freezing.
h) Make sure an appliance mounted on a tank is securely installed before
operating it.
i) Read and observe all the important notices on the appliance.
j) If an extension cord is necessary, a cord with a proper rating should
be used. A cord rated for less amperes or watts than the appliance
rating may overheat.
Care should be taken to arrange the cord so that it will not be tripped
over or pulled.
k) This appliance has a polarized plug (one blade is wider than the
other).
As a safety feature, this plug will fit in a polarized outlet only one way.
If the plug does not fit fully in the outlet, reverse the plug.
If it still does not fit, contact a qualified electrician.
Never use with an extension cord unless plug can be fully inserted. Do
not attempt to defeat this safety feature.
Exception:
This instruction may be omitted for an appliance that is not provided
with a polarized attachment plug.
"SAVE THESE INSTRUCTIONS".
l)
DON'T
unplug the cord.