6-CHCU 3.6/6kV Mining Trailing and Reeling Cable

6-CHCU 3.6/6 kV Mining Trailing and Reeling Cable

The 6-CHCU family covers three 3.6/6 kV screened cables for large open-pit machines, and the choice between them is decided by the winding geometry rather than by current. The base 6-CHCU build is for winding mechanisms with a single deflection direction, where the take-up drum axis sits at a right angle to the direction of travel. 6-CHCU-TT adds a polyester anti-torsion braid for mechanisms with various deflection directions, where the drum axis runs parallel to the machine. 6-CHCU TTAR keeps the anti-torsion braid and adds an extra heavy-duty 5GM5 sheath.

The three are not interchangeable on paper. The base build is rated to a +250 °C short-circuit temperature, while TT and TTAR are rated to +200 °C, and only TTAR carries published static and dynamic tensile load limits.

• Rated voltage: 3.6/6 kV; maximum operating voltage 7.2 kV for TT and TTAR.
• Cross-sections: 3 × 16 mm² to 3 × 185 mm².
• Route: base for single deflection, TT and TTAR for multiple deflection directions.
• Twist limit: ±50 °/m for TTAR.

For 20/35 kV machine feeding above this range see 35-CHVU trailing cable; for German-standard reel duty see R-(N)TSCGEWÖU reeling cable.

6-CHCU Family Construction and Selection

Select by winding geometry first, then by sheath duty. The table below is the decision the three builds exist to answer.

Base 6-CHCU construction, to DS 073-2004

6-CHCU-TT construction, to DS 042-2005

6-CHCU TTAR construction

6-CHCU Applications

The family supplies power to large mobile equipment in open-pit mines: coal extraction machines, excavators, stackers and stowing machines, on trailing and reeling routes under severe mechanical duty.

• Base 6-CHCU: coal extraction machines where the reel deflects the cable in one direction only.
• 6-CHCU-TT: excavators and stowing machines whose drum axis is parallel to the machine, producing multiple deflection directions.
• 6-CHCU TTAR: stackers and excavators on the most severe trailing or reeling duty, where sheath wear governs life.
• Surface routes exposed to shock, pressure, abrasion and weather.

Application boundaries

Use of flexible cables follows VDE 0298-3. Current ratings are free-in-air values at 30 °C and must be corrected twice: once for ambient temperature and again for the number of reeled layers, using the factors in the specifications tab. Reeling a cable in four layers removes well over half its rating. Drum diameter, deflection pulley diameter, number of layers, speed and pull determine which of the three builds applies.

Related mining reeling references

Compare 35-CHVU for 20/35 kV machine feeding, R-(N)TSCGEWÖU for German-standard reel duty and (N)TSCGEWÖU for semi-fixed mine distribution.

Reference note: enquiries arriving marked 6-CHCu, 6-CHCu-TT or 6-CHCu TTAR are handled on this page; spacing and capitalisation variants refer to the same family.

6-CHCU Specifications

Bending radius by build and route

TTAR bending radii follow DIN VDE 0298 Part 3, Table 2.

6-CHCU base and 6-CHCU-TT size and electrical table

The base and TT builds share one dimensional and electrical table.

6-CHCU TTAR size, weight and tensile load table

6-CHCU TTAR electrical table

The short-circuit constant k = 122 is calculated to IEC 60949 for a 200 °C short-circuit temperature and a 90 °C conductor temperature.

Current rating correction factors

All cross-sections in all three builds are available to order.

6-CHCU Standards, Approvals and Order Documentation

Approvals

Order package

State which build is required, the machine and its rating, drum diameter and axis orientation, deflection pulley diameter, number of reeled layers, travel speed, expected pull against the TTAR tensile limits, ambient temperature, required drum lengths, marking string and any project inspection or documentation scope.