990-91380L-001

Prepare for HRG Earthing System

NOTE: The external impedance for an HRG earthing system is not included with the UPS. The external impedance for an HRG earthing system must be provided externally to the UPS by others.
  1. Remove the two preconnected cables that connect the E terminal on the bonding contactor to the ground busbar. Discard the cables.
  2. Connect an external impedance (not provided) between the E terminal on the bonding contactor and the ground busbar according to NEC article 250.36.
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