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INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 77
AC ELECTRICAL CONNECTIONS — SYSTEM GROUNDING
System Grounding (continued)
Figure 36 below illustrates a typical system grounding for a
3-pole and 4-pole Automatic Transfer Switch (ATS).
3-Pole ATS
In the 3-pole ATS, note the generator neutral is connected
to the ATS and is NOT bonded to ground at the generator. A
neutral to ground bonding jumper is factory installed in all
industrial gensets. Remove the jumper from the alternator
saddle box to meet electrical codes and grounding
requirements if required.
4-Pole ATS
In the 4-pole ATS system, a grounding electrode conductor
and a bonding jumper are used to connect the generator
neutral to ground. In some installations, a current
transformer (CT) may be required for ground fault monitoring.
Typical requirements for bonding and grounding are given in
the National Electrical Code, Article 250. All connections,
wire sizes, etc. must conform to the requirements of the
electrical codes in effect at the installation site.
Figure 36. Typical System Grounding
Bonding and grounding must be performed properly. All
metallic parts that could become energized under
abnormal conditions must be properly grounded. Failure
to do so can cause electric current to flow, causing
severe injury or death!