Grounding Electrode Conductor Connections - Gec; Figure 11 Common Trip Ratings For 10 - 30 Amp Range - ABB 827E Product Manual

Grounding Electrode Conductor Connections - GEC

A Grounding Electrode Conductor (GEC) bonded to the neutral is required where an AC source is
originated (a separately derived source). This provides a continuous AC fault clearing path to
ground. This is not an equipment ground.
Associated terminology: AC Equipment Ground Conductor (ACEG) or continuous "Green wire ground"
Determining connections for your configuration: There are several contributing documents to
consider when bonding a GEC to the 827E converter system: Customer specific standards, state and
local codes, and Article 250 from the NEC are primary sources. Customer specific installation
publications may also address differences in inverter installations in Isolated Ground Plane and
Integrated Ground Plane environments. There are various technical publications including Telcordia
documents TR-NWT-000295, GR-1089-Core and GR-1502-CORE that are also frequently consulted for
Central Office application installations in both ground planes.
Separately Derived System: NEC, Article 100 defines a separately derived system as follows: "A
premises wiring system whose power is derived from a battery, from a solar photovoltaic system, or
from a generator, transformer, or converter windings, and has no direct electrical connection,
including a solidly connected grounded circuit conductor, to supply energy from the serving utility to
the wiring system of the premises served".
Inverter systems without Maintenance Bypass Switches are separately derived systems. Inverter
systems with Maintenance Bypass Switches are not separately derived systems.
Customer specific technical publications may also include a section defining similar systems that
vary slightly. Generally, these publications do not differ significantly. However, customer specific
installation publications and state and local codes can take precedence.
Note Customer specific standards for installations in the isolated ground plane can vary greatly
from customer to customer. These standards must be researched completely prior to
installation start.
This manual addresses the most common installations in an integrated ground plane.
Figure 6 depicts typical wiring for the inverter system wired as a separately derived system without
the maintenance bypass switch (MBS).
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Figure 11 Common Trip Ratings for 10 – 30 Amp Range