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Energy Savings

Electricity transfer generates energy losses in the form of heat. By reducing the operating temperature of the power cables substantial savings can be made. The open structure of CABLOFIL maximizes ventilation and therefore reduces installation and operational costs.

Assessment

When an electrical current is running, the copper or aluminium cable cores heat up. The heat given off, known as the Joule effect, is caused by the resistivity of the material (its ability to resist the passage of an electric current).

This resistivity increases with temperature. If confined, the heat given off will increase the ambient temperature, thereby increasing both resistivity and resistance. To enable the required current to flow, more power will have to be supplied, with more energy being wasted. The resistance R of a conductor (cable) is proportional to the resistivity (p) of the material, based on cross sections (S) and length (L). R = p x (L / S)

Cable Resistivity
Solutions

  • Increase the cross section of cables to reduce resistance.
  • Ventilate cables to reduce heating.

As 90% of its structure is open, CABLOFIL is the closest solution to running a cable in free air and, in many cases, the standards do not make a distinction between the two. The NEC section 392.11(B) 3 allows cables to be run at free air ampacities, over 35% more amps than cable in a raceway.

Solutions
Energy Saving Evaluations
Energy Saving Evaluations

The following tests were conducted at Bureau Veritas - LCIE to compare the affect on cable performance by different cable tray systems.

Power cables are fed a steady current. Energy consumption is compared for different configurations. The test results show that consumption differs significantly between open and closed systems.

The graph below shows how the choice of system can affect overconsumption of electricity (by as much as 37%).

Energy Losses
Energy Savings