A3311804 - LÜTZE SILFLEX® Tray-ER TPE with UL/TC-ER/WTTC/MTW/CE Approvals

A3311804 - LÜTZE SILFLEX® Tray-ER TPE with UL/TC-ER/WTTC/MTW/CE Approvals

Part No.
with UL/TC-ER/WTTC/MTW/CE Approvals
Flexible Tray Cable · Shielded


  • Shielded multi-conductor cable for tray applications, with exposed run (open wiring) approval
  • Compliant with NFPA 79 for machine tool wiring
  • TC-ER for use with cable trays without conduit, which can reduce material and labor costs
  • Metal cutting equipment, machine tools, machine and plant construction, HVAC technology, assembly and production lines, and other industrial applications
  • WTTC – wind turbine tray cable rating for use in wind power generation
  • Dry, damp and wet locations
  • Flexible design with Nylon for crush impact resistance per UL 1277 and easy installation
  • Specially formulated TPE jacket for superior oil resistance
  • Cutting oil resistant – mineral & bio/vegetable based oil
    *specially tested with plant based cutting oil
  • Sunlight resistant
  • Direct burial
  • UL Type TC-Exposed Run
  • Talc free
  • Silicone free

Technical Data


Number of conductors/cross-section
Cross-section, metric
1 mm²
Jacket material
Jacket color
black RAL 9005
Outer Ø
8,2 mm
Outer Ø
0,323 inch
87 Lbs/Mft
36 Lbs/Mft

Element 1

Element construction
Conductor construction
AWG 18 (16/30)
  • AWG conductor
  • CU-wire bare
Conductor category
fine wire
Conductor marking
  • black
  • with white number print
  • green/yellow
Conductor insulation
  • PVC/Nylon

overall construction

Drain wire
CU-wire tin-plated
Overall shield
  • Aluminium laminate
  • foil shield
  • braid shield
  • tinned copper wires
Jacket characteristics
  • Oil resistant
  • Silicone-free
  • mineral oil-resistant
  • bio-oil-resistant

Technical data

Rated voltage UN
  • 600 V TC-ER 90C
  • 600 V MTW 90C
  • 1000 V WTTC 90C
  • 600 V UL AWM 105 °C
Temperature range fixed
-40 °C … +90 °C
Minimum bending radius fixed

Element 1

Element construction


  • TC-ER
  • cURus
  • cULus
  • UL Type MTW or DP-1
  • WTTC
  • Class 1 Div. 2 per NEC
  • Art. 336, 392, 501
  • cUL TC
  • CIC FT4
  • UL 1277
  • CE
  • RoHS
Oil resistant according to
  • Oil Res II
  • Oil Res I


CE These products are in conformity with the EU Low Voltage Directive 2014/35/EU


Frequently asked Questions

Which UL approvals are available for cables?

In America, the UL (Underwriters Laboratories) testing institute is a major institution for testing and approving electrical systems. The relevant approvals can apply to entire systems as well as individual components.

UL categorises cables into the UL recognized approval in compliance with the 758 standard "Appliance Wiring Material" (AWM) and various listings. AWM (Appliance Wiring Material) is based on a modular system where cables with an AWM approval can be made up of separate insulation and outer jacket approvals issued by the manufacturer. UL Listed involves subjecting the entire cable to UL testing.

The 2007 edition of the American NFPA 79 Electrical Standard for Industrial Machinery prohibited the use of AWM wires and cables in machinery cabling and explicitly demanded a UL Listing. This proved in many cases unpractical as for many applications there is no legislation to which a listing could be applied. For this reason, this regulation was modified in NFPA 79, edition 2012 and the use of AWMs is now permitted under certain conditions.

How much electricity can a cable transfer?

The amperage range of a cable depends on the cable cross-section and the heat resistance of the insulation material as higher currents heat up the cable to higher temperatures. Selecting the correct cable is the responsibility of the system planner as the cable manufacturer is not familiar with the specific application. Details can be found in the national standards and legislations such as VDE 0298-4 or VDE 0100.

What should be observed with shielded cables?

In principle, shielded cables have a significantly better electromagnetic compatibility in terms of both electromagnetic radiation and sensitivity to interference.

Cable shielding usually comprises electrically conductive materials that act as a equipotential surface to shield against electrical fields and minimise magnetic field components at higher frequencies resulting from induced eddy currents by compensation.

Braided copper is an extremely effective type of shielding; the higher the optical cover, the more effective the shielding. A metal-laminated plastic strip shielding is less effective, particularly at higher-frequency interference. Experience shows that optimum shielding can be achieved with a combination of both these shielding variants.

To offer protection against particularly high-frequency transient signals, we recommend connecting both sides of the cable shielding to the casing to allow eddy currents to flow. The system must be subject to equipotential bonding to prevent any ground loops.

Why is the temperature range divided into static and moving?

Flexible control cables are mainly insulated and covered with thermoplastic. When subject to high temperatures, thermoplastics become soft and malleable. This explains the various limit temperatures: with fixed installation cables it is not a problem when the plastics become soft. However, when the cables are moved, the plastic can be deformed and the cables can become damaged.

This also applies when the plastic becomes brittle at low temperatures.

What is the copper index?

As copper is a listed precious metal, the copper content in a cable is calculated depending on the current listed price. This calculation is based on the amount of copper that is present in the rated cross sections of the copper cables and shielding.

What does the cable category stand for?

The copper conductors in flexible cables usually comprise of numerous thin wires that are twisted together. In comparison to a single copper wire, in which the cross section corresponds to the sum of the single wires, twisted copper wires deliver a considerably higher ductility of the conductor and the entire cable. The international IEC 60228 standard specifies the wire thickness and electrical resistance for copper strands in various categories. The higher the category, the finer the wires:

Category 1: Massive conductors

Category 2: Multi-stranded conductors

Category 5: Finely stranded conductors

Category 6: Superfine stranded conductors

What is the difference between bending and torsion?

Different types of movement require different cable constructions. A cable with optimised bending load has different construction parameters than one designed for torsion load.

Torsion is the twisting motion with which a torque is tangential to the cable axis.

Bending is the twisting motion with which a torque is radial to the cable axis.

Is the jacket material resistant against certain chemical substances?

Please consult the "Chemical Stability of PVC and PUR Cable Jackets" overview in the download section.