Manual | MNS-SG Operation and Maintenance 33
Push device off the forklift
Push the overhead lift device off the forklift onto the rails.
Test the continuous movement of the overhead lift device.
If the movement is correct, reinstall the carriage stop
bracket.
4.8.1.
Operating the overhead lifting device
Observe the following requirements when operating the
circuit breaker lifting device:
-
The wheels must be properly set on track.
-
Do not depend upon the drum attachment to support
the full breaker weight. Allow 4-5 wraps of wire rope to
remain on the drum.
-
Prevent snarling, kinking or knotting the wire rope.
-
Lift only circuit breakers.
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Do not alter the lifting device or the circuit breaker
lifting yoke.
-
Never walk or stand under a circuit breaker suspended
by wire rope.
-
Do not leave a circuit breaker suspended on the wire
rope.
4.9.
Connect cable and wiring
Verify that all cables are de-energized prior to installing.
4.9.1.
Install connections
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general information
All conduit installations should conform to local codes and
be compatible with the NEMA environmental rating of the
switchgear. Install conduit away from the ground busbar to
avoid possible damage. Position the cable connection to
minimize bending and maintain relative vertical alignment to
incoming connections.
When installing cable, make sure the temperature is above
32°F (0°C) unless the cable is appropriate for installation at
lower temperatures.
On every connection, verify the compatibility of wire size,
type and stranding for the type of power terminations (lugs
or terminals).
Use correct lugs in all applications. Crimp compression lugs
with the manufacturer- recommended tools. Properly
connect all line and load cables to avoid bolted-fault and
equipment damage (see chart p.32).
Cable support is a metal structure designed to help to
support the filed cables connections. These structures are
designed to be adjustable in height and depth to the end
user preferences.
Use the switchgear electrical schematics provided to verify
field wiring connection points.
Tighten any unused bolts.
The SG has the option for top incoming, bottom incoming,
bus duct (top or bottom), and connection to dry
transformers (closed couple connection).
Closed couple connection are available for 3-phase 3-wire
and 3-phase 4-wire and designed for dry transformer only. It
can be on either side of the SG.
For the neutral there are three options:
-
UL service entrance.
-
Bonded neutral to ground.
-
Neutral separated from ground.
If your installation has top incoming connections:
Refer to the elevation drawings shipped with the
switchgear to check space availability for incoming
cables.
Make the connections only after the switchgear is in place,
leveled, anchored and the sections joined and spliced. Bring
the conduit into the top of the incoming section.
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DANGER
