Low-Temperature Installation Solution for Brazilian Cable Reeling Frames

Tratosflex-ESDB reeling cables with rubber insulation, compliant with NBR 6251, are suitable for low-temperature Brazilian cable reeling frame installations, operating reliably down to -50ºC.

Cable Selection for Low Temperatures

For Brazilian cable reeling frames, Tratosflex-ESDB cables are highly recommended due to their rubber-based insulation, fillers, and sheaths, which allow operation in extreme temperatures from -50ºC to +90ºC while maintaining flexibility and mechanical integrity during high-speed reeling operations (up to 300 m/min). These cables are designed to prevent internal twisting and conductor breakage, which is critical for reeling frames exposed to cold environments. Other options include low-voltage flexible reeling cables with EPR or PCP-based compounds, which provide abrasion resistance, UV and ozone protection, and maintain flexibility at low temperatures.

Compliance with Brazilian StandardsAll cable installations in Brazil should comply with ABNT NBR 6251, which specifies construction requirements for insulated power cables from 1 kV to 35 kV. This standard ensures that the conductor, insulation, shielding, and protective sheath meet mechanical and electrical performance criteria suitable for industrial applications, including low-temperature environments. For cold installations, selecting cables with HEPR or EPR insulation is recommended, as defined in NBR 7286 and NBR 7287, ensuring chemical and physical stability at low temperatures.

Installation Guidelines

Proper installation is crucial for low-temperature performance: Reeling direction: Wind the cable on the drum in the correct stranding direction (Z-lay or S-lay) to prevent torsion. Minimum bending radius: Adhere strictly to the manufacturer's specified bending radius to avoid mechanical stress. Tensile load limits: Ensure copper conductors are not subjected to tensile stress exceeding 15 N/mm² unless otherwise specified.

Protection during installation: Shield the cable from external damage, especially in cold conditions where materials can become brittle. Partial unwinding: Avoid fully unwinding the cable from the supply drum; maintain at least two windings on the reeling drum during installation. Practical RecommendationsPre-condition cables: If possible, store cables in a temperature-controlled environment before installation to reduce brittleness.

Use clamps and grips: Employ Kellem grips or large surface clamps to secure cable ends without inducing torsion. Regular inspection: Monitor for micro-cracks or insulation hardening during initial operation in low temperatures. Consider fiber-optic integration: For control and signaling, select cables with integrated fiber optics rated for low temperatures.

By combining Tratosflex-ESDB or equivalent low-temperature flexible reeling cables, adherence to NBR 6251 standards, and careful installation practices, Brazilian cable reeling frames can operate reliably in cold environments while maintaining long service life and mechanical integrity.