HP Jet Fusion 4200 Product Documentation Site Preparation Manual page 26

The installation of a single point and dedicated ground.
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Power stabilizer equipment that is supplied by three uninterrupted phase wires and one uninterrupted
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copper ground wire from the main building service panel. These should run in the same conduit and should
be at least equal in size to the phase wires.
Electrical configuration of multiple printers
The power consumption of this printer is not fully balanced among the three power lines throughout the whole
printing process. When more than one printer is connected to the same power line or UPS, HP recommends
rotating the connection of the three phases of each printer to help balance the total consumption, as shown
below.
Repeat this connection scheme for every group of three printers on the same power line.
22 Chapter 2 Site preparation requirements for the printer ENWW