INTRODUCTION
Medium Voltage Overhead Cables NF C 33-226 are used for medium voltage public distribution from 6/10kV to 18/30kV. They are suitable for the distribution of electrical energy under normal conditions of overhead installations.
CONSTRUCTION
- Phase conductor: Aluminum, class 2,circular compacted conductors
- Phase conductor screen: Non-metallic,semi-conducting compound
- Phase insulation:Cross-linked polyethylene(XLPE)
- Phase insulation screen:Non-metallic,semi-conducting compound,extruded strippable grooved elastomer
- Phase longitudinal water tightness: Swelling powder
- Phase metallic screen: Aluminium plastic tape (AL/PET)
- Phase outer sheath: Polyethylene (PE)
- Messenger conductor: Stranded galvanized steel wires
- Messenger insulation: Polyethylene (PE)
The three phase cable is assembled around a Messenger, which is composed of a steel core with a cross-sectional of 50mm² and covered insulation with a nominal thickness of 1.2mm.The galvanized steel stranded wire minimum breaking load is 64700N.
CHARACTERISTICS
- Maximum conductor temperature in normal operation: 90˚C.
- Short circuit temperature (5 seconds maximum duration ): Shall not exceed 250˚C.
- Ambient installation temperature, range: -10 ~ +50˚C.
- UV resistance: AN3
- Water proof: AD8
- Mechanical resistance to impacts: AG4
- Minimum bending radius: During installation:15D. After installation:10D.
Note:D is overall diameter of cable.
INTERNATIONAL STANDARD
- IEC 60228 Conductors of insulated cables
- NF C 33-226 Câbles isolés et leurs accessoires pour réseaux d’énergie Câbles de tensions assignées comprises entre 6/10(12) kV et 18/30(36) kV, isolés au polyéthylène réticulé à gradient fixe, pour réseaux de distribution
- IEC 60502-2 Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 30kV (Um=36kV) – Part 2: Cables for rated voltages of 6kV (Um=7.2kV) and 30kV (Um=36kV)
