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The clamping force
of properly tightened screw shall create a
contact area large enough ensure good
conductivity, without the risk overhea-
ting.
Al/Cu gives higher risk corrosion
and settlement, use contact grease. The installation
of terminal with bolt joint for electrical
transmission requires special attention.
Otherwise, the risk settlement the
outer edge the flat washer increases
where the clamping forces are concen-
trated.
Recommended tightening torque
Thread
Steel
8.
Cu/CU provides the best joint, good
contact and small risk settlement.9 *
Steel
10. Current load should be
checked.
The diameter the tension washer
should less than equal the flat
washer’s, even after tightening fully. This applies regardless the hard-
ness the conductive materials (which
are softer than HB200).
nut and the hard flat washer, can
provide increased margin towards
excessively high settlement. The joint must achieve
a sufficiently high clamping force, distribu-
ted desirable manner and ensure the
electrical properties over very long time
under high and varying loads different
characteristics.
• Choose stainless A4-80 environments
when there high risk corrosion. important to
clean and use contact grease.8 *
Steel
10. Otherwise, there is
risk large deformation the conducting
material that reduces the tension, which
can increase the risk inadequate contact
area and overheating.
Tightening must carried out con-
trolled manner using torque tools, where
the relevant screw tensioned the
specified torque. order for the clamping force be
distributed evenly and create sufficiently
large contact area, hard flat washers must
always used, type BRB HB200 SMS 70,
under screw head and nut. See image
below.
Preparatory:
• Clean contact surfaces from dirt, oxide
layers and grease using steel brush and
denatured alcohol.
Bolt joints. This especially im-
portant for aluminium. a
spring washer type DIN 6796,
with very high clamping force, is
positioned and secured between e.9 *
Stainless Stainless *Stainless *
- P
M5 5,5 6,6 118,0 8,0 9,2 164,0 5,5 6,2 111,0
M6 9,5 9,2 114,0 13,0 13,0 160,0 9,5 8,6 107,0
M8 23,0 17,0 116,0 32,0 24,0 164,0 22,0 16,0 109,0
M10 45,0 27,0 92,0 64,0 38,0 129,0 45,0 25,5 88,0
M12 78,0 40,0 125,0 110,0 56,0 175,0 76,0 37,0 116,0
M16 200,0 75,0 156,0 280,0 110,0 229,0 185,0 69,0 144,0
Mv tightening torque (Nm)
Ff pre-tensioning force (kN)
p flat pressure (N/mm²)
FZB electroplated gloss chromed
FZY electroplated hard chromed
FZM FZM= mechanically galvanized
* (FZB, FZY, FZM)
A4/80
Selection washers:
• Always select hard flat washers the
BRB, HB200 type.
.
• The tension washer can normally be
excluded.
Cu/Al provides low risk galvanic
corrosion when the rail made Al.
Mounting the terminal against
the connection rail
Max.
• The terminal palm and busbar may of
different materials. It
must never placed
directly against electrical
contact surface without flat washer in
between.
• spring washer sufficient and should
be placed the rear the
busbar, between nut and hard flat
washer, see diagram.
Al/Al gives weaker joint. It
is important that this done correct
manner, important the contact
crimping the other end the terminal
as described above.8 *
Steel
8.
Installation:
• The screws must tightened with tor-
que tools that tightening is
controlled.
Tension washers
The use different types locking
elements spring washers often
increases the risk settlement.g.
Bolt joint with spring washer.12:6
Bolt joints
Bolt joints
Users/installers bolted connectors
always have adhere to, and follow
electrical codes and norms the local
region where they are making such instal-
lations. Tension was-
her flat washer can reduce the risk
of settlement. When using spring washers, is
sufficient and preferably placed on
the opposite side the terminal.
• Petroleum jelly contact grease reduces
corrosion risk cleaned surfaces
Fastener selection:
• Screws and nuts strength class 8. These are
based theoretical calculations, verified
tests and experience from field studies. terminals the same size on
the same screw.
• Torque wrenches must calibrated
regularly. The flat washer must have an
external diameter least large the
tension washer. The information below general
and hence, should never seen an
installation instruction. The accuracy the tool
is great importance.9 *
Steel
10.8. Oil the screw when installing. very important fol-
low the installation instructions.8 *
Steel
8. tension washer type DIN
6796 used, must placed between
the screw head/nut and the flat washer.
Even the torque recorded correctly,
the pre-tension force depends entirely on
the friction. Accuracy better than ±5%. Surfaces that are
tinned, nickel-plated, silver plated must
not brushed.
• Greased galvanized screws provide the
least dispersion the pre-tension force.
• Tightening torque according the table
above
