GE Industrial Solutions Evolution Switchboards - Manuel (Page 7)

EEvvoolluuttiioonn SSeerriieess™ ™ SSw wiittcchhbbooaarrddss
Chapter 2- Installing the Switchboard
77
FFiigguurree 55.. Non-walk-in switchboard – outdoor construction.
SSeeiissm miiccaallllyy CCeerrttiiffiieedd EEqquuiippm meenntt
For seismically certified switchboards of IBC 2006 & IEEE-
693-2005, follow the previous instructions with the following
modifications. Locate the seismic kit shipped with each
section before installation. The kit for each section is located
in the rear of the switchboard section attached to the
horizontal bus. The kit should contain four 1-inch spacers
per section. These spacers should be installed as shown in
Figure 6 or Figure 7. When floor channels are used, these
spacers should be installed as shown in Figure 8.
FFiigguurree 66.. Installation of seismically certified switchboards
without floor sills.
FFiigguurree 77.. Alternate installation of seismically certified
switchboards without floor sills.
FFiigguurree 88.. Installation of seismically certified switchboards
with floor sills.
FFiieelldd CCoonnnneeccttiioonn aanndd TTeessttiinngg ooff G Grroouunndd--FFaauulltt
PPrrootteeccttiioonn SSyysstteem mss
Observe the following points when connecting and testing
ground-fault systems, as illustrated in Figures 9 and 10.
• In the service-entrance section, bond the neutral
conductor to the switchboard ground bus with a main
bonding jumper (ground strap). Locate this grounding
point on the neutral conductor on the supply side of any
ground-fault sensors involving the neutral conductor.
Do not make grounding connections to the neutral
conductor on the load side of the service disconnect.
• On load feeders, run all phase conductors (and neutral,
if used) through the sensor window(s), with all in the
same direction with respect to sensor polarity.
• Do not run equipment ground conductors through
ground-fault sensors. Connect them directly to the
switchboard ground bus, not to the neutral bus.
• Connect the service grounding electrode (water pipe,
etc.) to the lug provided on the switchboard ground bus
for this purpose.
• Whenever a service is derived from a grounded neutral
supply, the grounded neutral conductor must be
brought into the service-entrance equipment, even if
the grounded conductor is not needed for the load
supplied by the service. This is required to provide a low-
impedance ground-fault current return path to the
neutral to assure operation of the overcurrent device,
for safety to personnel and property.
• Refer to GE publication GEI-48907 for instructions on
conducting performance test of new installations of
ground-fault protection systems.
Front
Pad without Sills
Pad with Sills
1 5 / 8 ”