Metrohm Power Box (for 899 Coulometer) - Manual (Page 13)

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3 Installation
Power Box
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Note
The plug of the power supply unit is protected against accidental
disconnection of the cable by means of a pull-out protection fea-
ture. If you wish to pull out the plug, you will first need to pull
back the outer plug sleeve.
2 Connect the power supply unit to the mains supply using the mains
cable.
Figure 4 Connecting the power supply unit to the Power Box
Caution
Make sure that the connection cable (2-3) is not plugged in at the
mains connection socket (2-1) accidentally. Otherwise the Power Box
will be discharging needlessly.