1. Usage:
The fire-resistant cable NH-VV-4*120+1*70 is suitable for fixed laying on the transmission and distribution lines with AC 50Hz and voltage level of 1KV and below for power transmission; It is mainly used in power plants, petrochemical industries, steel plants, tunnels, papermaking, substations and computer centers and other occasions with high fire protection requirements. It can ensure that the emergency system can get uninterrupted power after a fire**.
2: Fire resistant cable NH-VV-4*120+1*70 Features:
The structure of fire-resistant cable NH-VV-4*120+1*70 is different from that of flame-retardant wire and cable, it can ensure the normal operation of the line for more than several hours during or after long-term combustion, even if the polymer material at the flame is burned.
3. Model name: see Table 1
Table 1
Note: In addition to the above models, other types of fire-resistant wires and cables can also be produced. Such as fire-resistant computer cables, fire-resistant compensation cables, etc.
4. Specification range:
1) The specifications of fire-resistant PVC insulated power cables conform to 06 1kV PVC insulated and sheathed power cables (Table 3) specified.
2) The specifications of fire-resistant XLPE insulated power cables meet the requirements of XLPE insulated power cables of 35kV and below (Table 3).
3) The specifications of refractory PVC insulated wires (cables) comply with the provisions of PVC insulated wires (cables) (Table 1).
4) The specifications of the fire resistant control cable are in accordance with the provisions of PVC insulated and sheathed control cable (Table 2).
5. Main technical performance of fire-resistant cable NH-VV-4*120+1*70:
1) Due to the high temperature at the time of fire, more than 700 meters, copper conductors (the melting point of copper is 1083), in order to eliminate the internal stress of the insulated core, multiple stranded conductors are compact type.
2) The fire-resistant wire and cable can be kept energized for more than 3 hours when the flame temperature is 800 and the applied voltage is 1kV.
3) This product is mainly manufactured according to IEC60331 standard.
4) The refractory tape is made of silicone glass filament reinforced mica tape.
5) The fire-resistant layer of the fire-resistant cable adopts the combination structure of "inorganic + organic".