precautions for aluminium cable usage

precautions for aluminium cable usage
PRECAUTIONS FOR
ALUMINIUM CABLE USAGE
IN KLEMSAN TERMINAL BLOCKS
N EUTRAL
VASELİNE
• Precautions against oxidation should be taken while
using aluminium cables.
• There are several special products against oxidation,
however the most practical and easy solution is using
vaseline.
• Application of vaseline on the stripped parts of the
aluminium cables that contacting the terminal block, will
prevent oxidation.
Otherwise, the bare cable ends contacts the air and
will start a rapid oxidation in the terminal block. Voltage
values will drop consequently
2
N EUTRAL
VASELİNE
• If cutting the oxidized cable end is not needed, the oxide layer
can be cleaned manually with a knife carefully to not affect the
cable cross-section.
• Vaseline is applied to the surfaces after the cleaning process.
3
• Aluminium cables are not flexible as copper cables,
therefore they are mostly in solid and stranded form.
• While using aluminium cables, especially the stranded
types, conductive materials should be carefully watched
against braking and cracking.
Otherwise, the cross-section of the cable will
decrease and terminal temperatures will increase as a
result.
4
• Conductivity rates of aluminium cables are lower than
copper cables.
• Rated current values indicated in the terminal block
data sheets should not be considered while using
aluminium cables.
While using aluminium cables, the current rate
indicated for copper cables should be multiplied by 0.7,
the result will give the maximum current value which
should not be exceeded unless otherwise indicated.
5
• Maximum torque values indicated in the technical
specifications should not be exceeded while using
aluminium cables.
• Users should check the tightening process every other
day according to the torque values indicated in terminal
block data sheets and make sure that the screws are
correctly tightened in the given maximum torque value.
• Aluminium cables get softer in time and this cause
the connection loose. Connections should be checked
regularly as indicated above
6
• Stripping lengths indicated in the terminal block data
sheets are quite important especially for aluminium
cable connections.
• Aluminium cables without insulation can easily become
oxidized.
+
7
• Narrow curves or corners should be avoided while
using aluminium cables within panels and wiring ducts,
wiring ducts corners should be as wide as possible.
Otherwise, risks of cable braking, bending or
cracking possibilities will increase.
8
CORRECT ANGLE
WRONG ANGLE
• It is recommended to use Al/Cu type insulated cable
terminals with stranded aluminium cables.
9
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