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Centric 3x480 Vac, Installation Guide, rel. 2.2
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Figure 12: Surge arrestor Neutral, for “4-wire + Ground” infrastructure
Attention: There is a surge arrestor at the rear of the UPS. It is normally hidden
by a large metal panel (see Figure 12).
When connecting the UPS to a “4-wire + Ground” infrastructure, disconnect the
blue wire from the grey terminal that is next to the surge arrestor, and connect
the wire to the Neutral point of the surge arrestor.