Abstract
This paper discusses the impact of low-level electrical current on the temperature of electrical cables installed in surface grooves of oriented strand board (OSB). The three-wire power electrical cable (copper conductors each with a cross-section of 1.50 mm2) with fire reaction class B2ca and construction OSB intended for use in dry or humid environments were investigated. The electrical cable was powered by an alternating current (AC) power supply (230 V) and connected to incandescent light bulbs with a total power input of 200, 400 and 600 W (this power input corresponded to an electric currents of 0.87, 1.74 and 2.61 A). Incandescent light bulbs were connected in parallel to the cable. During the test, thermocouples were used to measure temperatures on the surface of the electrical cable, on the surface of the OSB at a distance of 2 cm from the centre of the cable and the ambient temperature. The data obtained show that as the electrical current increases, the temperature of the cable installed in the OSB surface grooves increases. The maximum cable temperature (30.1 °C) was recorded at an incandescent light bulb of 600 W. The recorded temperature (30.1 °C) is lower than the core temperature limit of the investigated cable under normal operation (90 °C).
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