| Title |
A Study on the Fire Risk According to the Cable Arrangement |
| Authors |
Sin-Dong Kang ; Jae-Ho Kim |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2019.33.10.027 |
| Keywords |
Cable Arrangement; Flame Propagation; VCTF Cable; Cable Tray |
| Abstract |
In this study, the thermal and flame propagation characteristics of cable in perforated cable tray used in a low voltage indoor distribution line were analyzed according to the arrangement of the cable using Light PVC sheathed circular cord(VCTF) cable. A thermocouple was attached to the inside and outside of the cable to measure the temperature. The cables were arranged in vertical and horizontal directions and, layered in triangular and rectangular shapes. As compared to the temperature inside a single cable, the temperatures increased when numerous cable were arranged in a horizontal direction and layered in triangular and rectangular shapes. The temperature inside the cables reached a peak of 305 ˚C when the current was twice the allowable current. At allowable current, the temperature increased to 62˚C when the cables were layered in a rectangular shape. This was close to the maximum permissible temperature for VCTF cable(i.e., 70 ˚C). The insulation resistance of the VCTF cable declined dramatically in accordance with increases in temperature, which not only raised the risk of short circuit and ground faults but also accelerated the cable deterioration. The flame propagated at a velocity of 2.7 cm/sec in the vertical direction and 0.95 cm/sec in the horizontal direction at twice the allowable current. The faster propagation velocity in the vertical direction was due to the characteristics of flame and plume, which moved in an upward direction due to a buoyancy effect. |