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Installation
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
Before any primary cable connections are
made, the cables should be identified to
indicate their phase relationship with the
switchgear connections. This is necessary to
ensure that motors will rotate in the proper
direction and that the phase rotation is the
same when interconnecting two different
sources of power.
There are two methods of making primary
cable connections, two are discussed below:
1. Potheads are used when it is desired to
hermetically seal the end of the cable
to make a moisture-proof connection
between the cable and switchgear bus.
A pothead also prevents seeping of oil from
the end of oil impregnated varnish cambric
or paper insulated cable.
2. Prepackaged cable termination kits can be
used if the sealing features of a pothead are
not needed. These kits, which are available
from several suppliers, usually include all
the material necessary to terminate the
cable and to provide stress relief at the
termination.
No insulation materials are normally
furnished for cable terminations. When
potheads are supplied, insulation materials
are furnished for the bar terminations to
the pothead studs.
In all cases, carefully follow the cable
manufacturer’s recommendations for
installation and termination of the type of
cable being used.
O. INSULATING PRIMARY CABLE TERMINATIONS
The factory does not furnish insulating
materials for completing the termination
of primary cables, nor does it furnish stress
cone material. The cable manufacturer’s
recommendations should be followed for the
type of cable being used.
All field assembled joints for primary cable
terminations must be insulated to maintain
the dielectric ratings of the switchgear. These
joints should be prepared as outlined in
Ch 4 Installation, L. Connections. Upon
completion of the cable termination, care
must be exercised when taping the exposed
termination.
1. All terminations must be prepared for
insulation as outlined in Ch 4 Installation,
L. Connections.
2. The instructions for application of the tape
insulation are the same as outlined for
wrapping of joints.
3. As an alternative to taping, heat-shrink or
cold-shrink insulating systems rated for
the system voltage may be used. Follow
the instructions provided by the insulation
system manufacturer when installing such
material.
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