11
• Power supply units are not allowed for use on human beings or animals.
• Hazardous voltages will be produced when the outputs of several power supply
units are connected in series (> 35 V D.C.).
• Do not cover the ventilation slots of power supply units. Such devices are cooled
by convection in most cases.
• Do not operate unattended power supply units and loads connected to them. Take
measures apt to protect and secure the loads connected from the effects pro-
duced by the power supply units (e.g. excess voltages, failure of the power supply
unit) and the effects and hazards originating from the loads themselves (e.g. inad-
missibly high power input).
• Power supply units may produce voltages exceeding 50 V D.C. in a malfunction
case. Such voltages cause hazards, even if the specified output voltages of the
devices are lower.
• When working under a voltage only use tools which are explicitly allowed for the
purpose.
• The two-pole plug at the output of power supply units may not be modified or
rebuilt.
• Avoid installing bare metallic cables and contacts. Cover all bare points by suit-
able, difficultly inflammable insulating materials or take other measures, thus pro-
tecting such points from being directly contacted. Likewise, take measures apt to
protect the electrically conducting elements of the loads connected from being
directly contacted.
• If there is reason to believe that safe operation has become impossible put the
power supply unit out of operation and secure it against any unintended operation.
Safe operation must be presumed to be no longer possible, if
- the unit exhibits visible damage
- the unit does not operate any longer
- the unit was stored under unfavourable conditions for a long period of time or
- the unit was exposed to extraordinary stress caused by transport.
Summary of Contents for 51 16 08
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