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22 Researching the requirements
Isolated ground topology
A dedicated Isolated Ground (IG) bus bar is required with this method.
This IG bus is located in the AC panel and serves as the ground window. It
is used for all AC (green wire) grounds as well as logic returns. It also
accommodates a conductor which references to the (+) battery bus in a DC
system. An alternate form of this isolated topology is to use one or more
isolated equalizing bars external to the AC panel but which connects to
ground exclusively by means of the AC IG bus.
Isolated orange outlets are required (as per NEC 250-74 Exception 4).
Grounding conductors shall be routed with the phase conductors (Article
300-20). All ground wiring-for IG receptacles are to be terminated on the
dedicated IG bus per applicable codes (complies with NEC 384-27).
Non-isolated ground topology
In a non-isolated system the AC equipment ground (ACEG) connects to the
metal panel, and the associated conduit may also contact various structural
metal. This ground alone is not adequate for the SL-1 system, but a
dedicated ground conductor which connects to the main building ground is
then used for the main ground window to terminate logic returns and
reference the (+) battery bus. Frame grounds will connect to the ACEG.
Grounding guidelines
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The following must be observed to implement the single-point ground:
-
All ground conductors must be identified in accordance with local
codes and terminated in a manner that is permanent, resulting in low
impedance connections.
-
Terminations should be accessible for inspection and maintenance
during the life of the installation.
-
All grounding conductors must be continuous with no splices or
junctions and tagged,
“D
O
not remove or disconnect.”
They should also be insulated against contact with foreign grounds.
-
Grounding conductors must be no-load, noncurrent carrying cables
.rX
under normal operating conditions.
Installation planning 553-3001-120