Ensure that you use the NCG Cable Grips Please note that
this procedure applies only to NCG Cable Grips.
When you first come to fit your Cable Grip, you will probably
find that the conductor has been cut using some shearing
Mechanism, for example a parrot beak cutter. This method
of cutting leaves a very sharp edge on the end of the
conductor, as Figure 1 shows.
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In order to obtain maximum strength from your cable grip, it
is extremely important to remove the sharp edge and it is
very easy to do, only taking a minute or two. Figure 2.
A rule of thumb for the amount of chamfer on the conductor,
is approximately 30" chamfer for a distance of approximately
half tlie diameter of the conductor. This applies whether the
cable is a solid copper rod, or a stranded aluminium
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When you unpack your cable grip, you will notice that the
end has probably closed over, similar to that in the
photograph illustration. Figure 3.
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This does not mean that the grip is in any way damaged.
You will need to open up the mouth of the cable grip before
trying to fit it on to the end of the conductor. To open up the
cable grip, all you have to do is, by hand, manipulate the
wires at the end until you get a nice opening as per the
photograph. Figure 4.
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If you are going to fit the cable grip to a stranded
conductor or even a wire rope, it may be necessary to
use some PVC electrical tape. Tape down the end of the
conductor for about 25mm. just to prevent the strands
from coming out of their formation and snagging or
catching on the inside of the cable grip as it is being
fitted. It is now just a matter of putting the mouth end of
the cable grip against the end of the conductor and
slowly working it on.
In the picture, Figure 5, the conductor has been pushed
into the cable grip as far as it can go - right up to the very
shoulder of the cable grip. Once you are sure it is in as
far as it can go, ensure that all the slack or the loose
spots along the grip have been eased out towards the
mouth end.
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During hailing operations it may be necessary to reverse
the direction of the pull. It is vitally important that the
cable grip is anchored at the mouth end to guard against
accidental release during a reverse haul operation. This
is a very simple procedure to do and it requires a nylon
cord or wire seizing to be place around the end of the
cable grip for approximately 25 or 30mm. The
photograph shows a nylon cord being used. Figure 6.
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The final process in the installation, is to get some PVC
electrical tape or some heat shrink and apply over the tail
of the grip and the sealing. Figure 7 This ensures that
all the uneven surfaces are covered and makes a smooth
transition from conductor to grip.
When using graded weave grips it is important to
remember that there are wires protruding from the grip at
intervals along the body of the grip. These wires can
also foul in a reverse hauling situation. It is important
that you tape or seize protrusions prior to the
commencement of the haul. |
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