id-Technik KT Series Cable Clamps

KT Series Cable Clamps | id Technik

CABLE CLAMPS | KT SERIES

id-Technik KT Series Cable Clamps are suitable for use with all types of single and multi-conductor HV, MV and LV power cables in indoor and outdoor applications – typically used to clamp and support MV HV power cables in the offshore wind industry including wind turbine generators, masts and shafts applications.

The cable clamps are designed to withstand the toughest environments and are resistant to UV radiation and exposure to chemicals.

The excellent material in id-Technik Clamps is non-toxic, not harmful to health, fully recyclable, self-extinguishing and low-smoke and zero halogen (LSZH). It is compliant with directive 2015/863/EU (RoHS) and regulation (EC) no. 1907/2006 (REACH regulation). The material is also non-metallic, non-magnetic and corrosion-resistant – it does not interact with the cable’s electromagnetic field.

Unlike metal cable cleats or clamps, no additional polymer coating is needed to protect the cable against mechanical damage, and KT series clamps do not need to be earthed.

Cable Clamps & Cleats | id Technik cable clamps are specified extensively to provide cable support to both onshore, offshore and subsea wind farm power cables in both single or trefoil arrangement – this includes 11kV / 33kV substation, inter-array and associated medium or high voltage cables.

➡ Read our Blog | IEC 61914 – Cable Cleats & Short Circuit Protection Calculations

id-Technik Cable Clamps are type-tested by accredited test institutes for the highest classification to the international standard IEC 61914.

id Technik KT Series Cable clamps – Technical Specification

Resistance	Ultraviolet rays, ozone, mineral oils, fuels, salts, alkalis, alcohol, hydrocarbons, ketones, ether, termites and radioactive rays

Flame resistance	UL94 5VA (IEC 60695-11-20) UL94 V-0 (IEC 60695-11-10) IEC 61914 following IEC 60695-11-5 Classification following DIN 5510, part 2 Flammability class: S3

Thermal expansion	0.01% per 10°C temperature increase

Tensile strength	120 N/mm²

Flexural strength	210 N/mm²

KT Series Cable Clamp

KT Series Cable Clamps Temperature Range

Ambient temperature	down to -60°C^*

Continuous operation	up to 120°C

Permitted short-term heating	up to 220°C

Operation life	more than 40 years of maintenance- and failure-free operation

Technik Cable Clamps KT Series Dimensions

The below table shows the dimensions in mm for KT Series Cable Clamps.

Type	D_Ø	D_Ø+	D_Ø++	L	B	I	H₁	H₂	h	a	d_Ø	Screw thread
KT 25/39	25-39	22-36	19-33	107	60	65	46-60	55-69	27	15	13	M12

D_Ø: Outer cable diameter

D_Ø+: ~ with one Elastic Inlay
D_Ø++: ~ with two Elastic Inlays

Tightening torque for fixing material – Top part: 5 Nm^**,Bottom part: 15 Nm
Dynamic Resistance to short circuits – 13.000 N
Applications – For trefoil formation and stacked fastening of single-and multi-core cables. Universal application indoors and outdoors between -60°C and +120°C.
Outer diameter of cables – 22 mm to 46 mm

kT series cable clamps dimensions technik

kT series dimensions

Features of KT Series Clamps

High mechanical strength and heat resistance due to special fibreglass-reinforced polyamide.
Type-tested to IEC 61914
Very low surface pressure on cables due to Cable Clamps’ large contact area
Unrestricted application both indoor and outdoor in extreme climates such as deserts, tropics, high altitudes, arctic climate, coastal salt fogs, flooding and ozone due to special resistance to ageing, ultraviolet rays and ozone
Easy to mount without special instruments and maintenance-free
Fastening of Cable Clamps adaptable to all local conditions

IEC 61914 Type-Tests – KT Series Clamps

Classification	Test Conditions	Approved Results
Material: non-metallic	high-grade polyamide
Operating temperature	-60°C / +120°C	passed
Resistance to impact	-60°C, 5 kg at 400 mm height	very heavy
Lateral load test (N) – in x-direction – in y-direction	At +120°C	20.000 N 30.000 N
Axial load test (N) – without Elastic Inlays – with Elastic Inlays	+120°C	600 N 800 N
Resistance to electrodynamic forces [N] suited to withstand multiple short circuits	Peak short circuit current: 151 kA Cable Clamp spacing: 0,84 m	25.000 N
UV-resistance	high	passed
Flame propagation	1 x 30s, needle flame method	passed
	2 x 10s, 50 W test flame method	V-0
	5 x 5s, 500 W test flame method	5VA
	3 min	S3

Assembly Instructions For KT Series Clamps

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

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

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

Fastener Length
depends on the Cable Clamp dimension and type of substructure

Application with Elastic Inlays
on-site fixing with any form of adhesive (e.g. glue, silicone or paste) will void the warranty immediately

KT Series Individual Components

Cable Clamp type	Outer diameter of cable	Metric screw thread (M)	Recommended length of thread*
KT 25/39	25-39 mm	M12	83 mm + x

* For maximum permitted outer cable diameter (can be reduced accordingly for smaller diameters)
x corresponds to the height of the substructure

It is essential to respect the specified tightening torques, especially for the upper part, to guarantee perfect and reliable functioning of the cable installation for the long-term.**

Mounting

Each KT Series Clamp has a simple design, consisting of two sections. These components are secured together by fasteners; which also provide the attachment to the structure.

Thanks to the versatile range of attachment options, Clamp installation methods can be easily adapted to suit local circumstances – and the lower section can be pre-installed for ease of installation. There are no special tools needed to install id-Technik cable clamps.

Suitable separation between Cable Clamps depends on:

Peak short circuit current
Dynamic short circuit resistance of the Cable Clamp
Cable design, including bending stiffness (bending modulus)

Use of Elastic Inlays

Elastic Inlays can be used as a cushion for elastic adjustment of cable diameter changes due to operational load changes and/or changes in the ambient temperature
Precise cable fixation and absorption of weight forces, primarily on cables installed along inclines or attached to vertical surfaces where restraint of axial movement is essential
Compensation of vibrations, e.g. in wind turbines, without reducing retention forces
Expansion of the Clamp’s clamping area, for cables with a smaller outer diameter

Elastic Inlays

Use with two Elastic Inlays, e.g. KT 25/39-2

KT Series Elastic Inlays

id-Technik was the first manufacturer to introduce a polyamide cable clamp to the world market offering an alternative to metal (aluminium or stainless steel) and wooden cable clamps. id-Technik distributes cable clamps for power cables of all voltage ranges (LV MV HV 1kV to 765kV).