Low Voltage Power and Lighting Cables ข้อกำหนดตัวอย่าง

Low Voltage Power and Lighting Cables. Low voltage power and lighting cables, both single and multi-core, comprise the bulk of the Plant cables. Single core construction shall be used for large power cables (240 mm2 and above, e.g., transformer secondary cables). Generally single core cables installed in the Plant shall be armoured with non-magnetic aluminium wires. Single core low voltage cables may be non-armoured where they are installed in locations (e.g. in substation buildings) where the risk of mechanical damage is minimal. The construction of armoured single core low voltage power cables shall be as follows: Standards : IEC 60502 or BS 5467 Voltage : Uo/U rms = 0.6/1 kV rms where Uo is the nominal voltage between conductor(s) and ground, and U is the nominal voltage between phase conductors. Conductor : Plain annealed high conductivity copper stranded to IEC 60228 Class 2 (circular up to 16 mm2 and shaped stranded for 25 mm2 and above). Insulation : Extruded cross-linked polyethylene (XLPE) to BS 5469. Bedding : Extruded layer of flame retardant black PVC compound with oxygen index not less than 30, temperature index not less than 300 °C and complying with Class ST2 of IEC 60502. Armour : Single layer of round non-magnetic aluminium wires. Oversheath : Flame retardant PVC complying with ST2 of IEC 60502. Oversheath Colour : Black The construction of armoured multi-core low voltage power cables shall be as follows: Standards : IEC 60502 or BS 5467 Voltage : 0.6/1 kV Conductor : Plain annealed high conductivity copper stranded to IEC 60228 Class 2 (circular up to 16 mm2 and shaped stranded for 25 mm2 and above). Insulation : Extruded cross-linked polyethylene (XLPE) to BS 5469. Core identification Phase conductors : Red, yellow, blue for cables with or without neutral conductor. Neutral conductor : Black.