HP Jet Fusion 340 Product Documentation Site Preparation Manual page 26

Power line disturbances
Reliable operation of your printer depends on the availability of relatively noise-free AC power.
In order to ensure optimum performance and reliability, your printer should be protected from variations in
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line voltage, which are common to production printing environments. Lighting, line faults, or the power
switching commonly found in machinery in factory environments can generate line transients that far
exceed the peak value of the applied voltage. If not reduced, these micro-second pulses can disrupt system
operation.
If the power line supplying the installation site is a public low-voltage line shared with other users, the
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power line impedance Zmax must be less than 80 mΩ, to comply with European standard EN/IEC
61000-3-12. If other users on the same power line report any flickering of incandescent light bulbs,
contact your electricity supplier to verify that the power network has an impedance lower than that
specified above.
You are recommended to include overvoltage (OVP) and transient protection on the power supply to the
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printer.
All electrical noise-generating equipment, such as fans, fluorescent lighting, and air-conditioning systems,
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should be kept separate from the branch circuit used for your printer.
If you have power-quality issues when taking power from the grid, an external Uninterruptible Power Source
(UPS) can be used in order to meet the requirements of your configuration.
Electrical grounding
The printer must be connected to a good-quality, dedicated ground line (also known as a protective earth) in
order to avoid electrical risk. Note your obligation to comply with the National Electrical Code (NEC) in the country
of installation.
The following grounding tasks must be fulfilled to meet the site preparation requirements:
Grounding wires should be insulated and at least equal in size to the phase conductors.
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Ground impedance should be less than 0.5 Ω.
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You should install a single point and dedicated ground.
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Electrical installation details
Your certified electrician will provide the following components:
Power cable with four power wires plus protective earth with the minimum cross-sectional diameter as
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specified in the power specifications table (below) for your printer
Grounding ferrule for protective earth wire suitable for the cross-sectional diameter as specified in the
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power specifications table
Strain relief or grommet to install on the plate
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Drill and tool to make the hole in the plate
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The certified electrician will perform the following tasks:
1. Confirm that the main switch is in the OFF position.
22 Chapter 4 Plan the printer production area and environment ENWW