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AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 4. Equipment Installation
Connect the Interconnect Control Wiring
Interconnect control wiring is located in the wire trough at the
top front side of the equipment and runs the length of the
lineup.
Interconnection of control wiring across shipping splits is
accomplished by connecting to terminal blocks located in the
cross-section wiring trough on top of the equipment (Figure
4.13).
If terminal blocks are provided, each wire must be attached to
the correct point on the terminal block, following the circuit
identification number attached to each wire.
Ethernet or other communication wiring is connected by
similar methods.
Switchgear Anchoring
Indoor Equipment
The switchgear assembly can be anchored to the foundation
by two methods. Use of anchor bolts or by welding.
Anchoring by Anchor Bolts
Indoor equipment is normally secured to their final mounting
surface by anchor bolts threaded into the embedded channel
sills (Figure 4.2). The bolts were loosely threaded into place
before reassembling the equipment shipping splits and
connecting to the close-coupled transformer, if appropriate.
The anchor bolts should now be tightened with a torque of
35-40 ft.-lbs.
Anchor by Weld
An alternate method of anchoring the equipment to its
foundation is to weld the equipment to floor sills (or the floor
itself if constructed of steel). Several methods (Figure 4.14)
are available to the purchaser for welding the equipment to
the channel sills.
Anchoring by Weld (Front Lag Sill)
The front of the equipment is attached to the embedded
channel sills (Figure 4.14) by two 3/16-inch fillet welds. It is
recommended that two welds, each 2-1/2 inches long (min.),
be used for each section to firmly tie the bottom width post to
the channel sill.
Anchoring by Weld (Rear Lag Sill)
The rear of the equipment may be anchored by weld using
one of three procedures.
29
Courtesy of NationalSwitchgear.com
The first method is by plug welds (Figure 4.14) using the
anchor bolt holes in the rear sill angle. The plug weld should
receive a minimum 1/2-inch bead around the entire
circumference of the anchor bolt hole.
A second method of securing the front and rear sill angles to
the channel sill is the use of two linear fillet welds for each
section. It is recommended that each weld be 2-1/2 inches
long (min.) with a 3/16-inch fillet (min.).
A third method for anchoring the rear of the equipment is to
remove the rear sill angle from the switchgear and weld the
rear bottom width post to the channel sill. These welds
should, like the front welds, have a 3/16-inch (min.) fillet and
each have a minimum length of 2-1/2 inches.
NOTICE: The installation drawings provided with the
switchgear will convey requirements for certified seismic
weld anchoring methods. Alternate anchoring methods
should be reviewed and approved by the customer and/or
their authorized representative. When the equipment is
subject to impact (shock) due to operating conditions or
environmental seismic (earthquake) conditions, alternate
anchoring methods must be approved by the customer's
certified structural engineer.
Figure 4.13 Interconnect control wiring
©2016 General Electric. All rights reserved.
DEH-41473
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