32 Installation Guide
Earthing the analytical unit
Safety
ONLY qualified personnel may perform the electrical installation of the monitoring system.
In accordance with international safety standards, the monitoring system uses a three-wire power cord
or line typically connected to an electrical panel that provides grounding for the monitor chassis.
• Ensure that the equipment, and any device or power cord connected to the analytical unit, is properly
grounded.
• Make sure that the analytical unit earth is at the same potential as the transformer earth.
• ONLY use power cords equipped with a protective earthing terminal.
• Protective earthing connections (grounding) must be active at all times.
DANGER
The absence of grounding can lead to a potential shock hazard that could result in serious
personnel injury.
If an interruption of the protective earthing is suspected, cut the power to the analytical
unit at the plant distribution panel and have the electrical circuit tested.
To earth the analytical unit cabinet:
1 Attach one end of the earthing wire to an earthing rod in the ground in the vicinity of the
transformer (for grounding wire gauge, see Table 2 on page 23).
2 Attach the other end of the earthing wire to the cabinet earthing lug located outside the cabinet, on
the left hand side (see Figure 20 on page 33).
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