WP-8000-CE7 Series User Manual, version 1.0.2 Page: 23
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Tips & Warnings
A good common ground reference (earth ground) is essential for proper
operation of the WP-8000-CE7. One side of all control circuits, power
circuits and the ground lead must be properly connected to earth ground by
either installing a ground rod in close proximity to the enclosure or by
connecting to the incoming power system ground. There must be a
single-point ground (i.e. copper bus bar) for all devices in the enclosure that
require an earth ground.