Application Profile

Clarifying questions and selection

1

Type of fastening

  • Single, trefoil, parallel, bundled or stacked installation of cables
  • Single Clamps: K, KT or KR series
  • Trefoil Clamps: KS, KP or KH series
  • Parallel installation: VR, RS and BE series 
  • Stacked installation: K, KR, KS, VR, RS and BE series
  • Bundling of multiple cables (including of different diameters): possible with all Cable Clamps

îd-Technik will be happy to assist you in choosing the suitable Cable Clamps (e.g. including for bundling multiple cables in one Clamp).

2

Cable outer diameter

The Cable Clamps offer a clamping range for cable outer diameters of 12 mm to 250 mm. To enable simple allocation, the type descriptors are named according to their clamping range: e.g. K66/90 is suitable for cables with diameters between 66 mm and 90 mm and KH 115/140 is suitable for three cables, each with a diameter of 115 mm to 140 mm.

Neighbouring Clamps of each product series have overlapping diameter ranges, to ensure ease of use at the range limits. We recommend the application of the smallest suitable Clamp. The clamping area of each individual Clamp is deliberately kept wide. Thanks to the large cable diameter range of each Clamp, a small number of different Cable Clamp types can cover a large range of cable diameters (including for different projects). This simplifies and reduces stock requirements, with the associated reduction in costs. It also makes planning and installation easier. In case of production related deviations in the cable diameter, the existing Clamp type can still be used. This avoids the need to re-determine and reorder other Cable Clamps (incl. the associated time delay).

Where there are overlaps between diameter ranges of different Clamp series, the short circuit dynamic resistance should be the primary selection factor.

3

Max. peak short circuit current:

The most important parameter in choosing a Clamp is the dynamic short circuit resistance provided. This determines whether the Clamp can restrain the dynamic forces that occur during a short circuit and protect the cable against damage. The entire cable system must be fully operational afterwards, without needing repair or maintenance.

Thanks to their excellent quality, îd-Technik Cable Clamps can withstand multiple short circuits.

Type-tested to the international standard IEC 61914, the product series have undergone several short circuit tests by an accredited test institute. In order to use realistic values, the short circuit tests were conducted with Cable Clamp separations and short circuit current values derived from practice. To simplify project planning, all Cable Clamps in a product series have the same dynamic resistance to short circuits.
 

The dynamic strength (N) is the material-specific property of our cable clamps, successfully determined during type testing, in order to be able to withstand the electrodynamic forces occurring
in the event of a short circuit. This very fast and steeply rising high electrodynamic “pulse force” is generated within only 1/100 of a second and then pulses in an attenuated manner at 100 pulses per second.

The mechanical strength (N) is the materialspecific property of our cable clamp which was successfully determined during the type test. Due to tensile tests (continuous, slow force build-up
over minutes), this property acts quasi statically on the cable clamp. This determines the ability of a cable clamp to withstand lateral loads caused by the weight of the cable including possible
longitudinal elongation.

It is important not to confuse the mechanical (static) strength (N) with the dynamic (shortcircuit) strength (N) of cable clamps!

Static tensile tests do not permit conclusions to be drawn about the short circuit dynamic force restraint capabilities.

The dynamic resistance of a Cable Clamp to short circuits can only be proven through short circuit testing.

4

Use of Elastic Inlays “EE”

The use of the Elastic Inlay is particularly recommended for technical reasons in the
following cases:

  • As a cushion for accommodating cable diameter variations caused by changes in
    operational load and/or ambient temperature, in order to prevent excessive pressure
    and deformation or damage to the cable jackets. It is generally recommended for
    use with cable diameters of 60 mm or more.
  • Precise cable positioning and absorption of gravitational forces, for cables installed
    on inclines or attached to vertical surfaces, where restraint of axial movement is essential.
  • Dampening of vibrations, e.g. in wind turbines, without loss of cable holding capability.
  • Expansion of the Clamp’s clamping area, for installation of cables that are at the low
    end of their diameter range.

Easy selection of the appropriate Cable Clamp for any application.

 

Type of fastening

Number of
cables/Clamp

Cable Clamp
series

Cable outer
diameter (mm)*

Dynamic resistance
to short circuits (N)**

Single

1

K24-3812.500
36-52
50-75
66-90
KT25-3925.000
KR75-10030.000
100-130
130-160
160-200
200-250

Trefoil

3

KS25-3613.000
33-46
KP29-4125.000
39-53
51-64
KH62-7530.000
73-86
84-97
95-107
105-117
115-140
138-165
Parallelindividually customisable +NEW  VR12-45 ++10.000
3NEW  RS12-45 ++10.000
3NEW  BE50-7615.000
Stackedindividually customisable +NEW  VR12-45 ++10.000
(3,6,9,...cables)
x
(2, 3,... layers)
NEW  RS12-45 ++10.000
2-3NEW  K24-3810.000
36-52
50-75
60-90
3x2NEW  KS25-3610.000
33-46
3x2NEW  BE50-7615.000
Bundled> 3allas aboveacc. to series
Made to orderacc. to costumer specification

* Using the Elastic Inlay changes the Cable Clamp’s clamping area. Diameter allocations can be found on the product pages pertaining to the specific product series.
** Further explanations see IEC

+ further information see product VR
++ Contact îd-Technik for diameter 12-21 mm, please.

The appropriate clamping separation requires knowledge
of the peak short circuit current and the dynamic resistance
of the Cable Clamps.

5

Mounting the Clamps

All îd-Technik Clamps can be universally mounted in any direction (horizontally, vertically,
hanging from the ceiling, attached to the side of a structure...). Screws attach directly to
the substructure through the holes on both sides, taking into account the tightening torque
indicated for the fastening material, which is specific to each series of Cable Clamps.

In the case of Clamps attached to a substructure, all of the dynamic forces during a short
circuit are transferred to the structure. The substructure must be mechanically compatible
with the Clamp’s dynamic resistance capability.

îd-Technik Cable Clamps are quick and simple to install, with no need for special tools.
No extra adapter components are needed to install and assemble the Clamps. The mounting
of Clamps can be adapted to local conditions and can also be carried out retroactively for
cables, which have been laid already.

The Clamp construction minimizes surface pressure, thereby avoiding damage to the cable
in case of a short circuit. The low tightening torque of the nuts (5 Nm - 8 Nm) on the top
part avoids cable damage or deformation but, due to the advanced design of the Clamp,
guarantees that the cables are held securely.

6

Selection of fastening material

Material and corrosion resistance:
The choice of material for the fasteners is dependent on the installation environment and
operating conditions (e.g. galvanised, stainless steel, etc.), strength grade 4.8 - 8.8

Type of screw:
Depends on the substructure (e.g. hexagon screws, T-head screws, threaded rod, etc.);
not included in delivery

Fastener diameter:
Depends on the Cable Clamp (dimension: metric screw thread [M])

Fastener Length:
Depends on the Cable Clamp (dimension H), the cable outer diameter and type of substructure

Only flat washers may be used. No spring or snap rings!
Do not use self-securing/self-locking nuts, this prohibits a defined tightening torque.

Screw
diameter
 

Max. hight
of the Clamp
(mm)

Hight of washer 
and nut
(mm)

Additional length
depending on dimension
of substructure (mm)

Screw
length
(mm)**

M 10

Max. value of H*
(rounded up)

+ 10

+x

H + 10 + x

M 12

Max. value of H*
(rounded up)

+ 15

+x

H + 15 + x

M 16

Max. value of H*
(rounded up)

+ 20

+x

H + 20 + x

* H varies depending on the cable outer diameter.
H1 for VR, RS, BE
H2 for VR, RS
H3 for VR, RS
H4 for K Double/Trible Tower, KS Tower
** For maximum permited outer cable diameter (can be reduced accordingly for smaller diameters)