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Supplying you with customized three core cables to bs 6622, it is one of the reliable three core cables to bs 6622 manufacturers and suppliers, welcome to wholesale our products at good price from our factory. Three Core Medium Power Cable to BS 6622 Table 1. Insulation Thickness Insulaton...
Supplying you with customized three core cables to bs 6622, it is one of the reliable three core cables to bs 6622 manufacturers and suppliers, welcome to wholesale our products at good price from our factory.
Three Core Medium Power Cable to BS 6622
Application | The three core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.6/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations. |
Standards | BS 6622 |
Conductor | Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2). |
Conductor Screen | Extruded layer of semi-conducting cross-linkable compound is applied over the conductor and shall cover the surface completely. The minimum thickness is 0.3mm and the maximum resistivity shall not exceed 500 Ohm-m at 90 |
Insulation | Insulation is of cross-linked polyethylene compound XLPE (GP8) conforming to BS 7655-1.3 or EPR (GP7), conforming to BS 7655-1.2. |
Table 1. Insulation Thickness
Nom. Cross Section Area | Insulation Thickness at Nom. Voltage | ||||
3.8/6.6KV(Um=7.2KV) | 6.35/11KV(Um=12KV) | 8.7/15KV(Um=17.5KV) | 12.7/22KV(Um=24KV) | 19/33KV(Um=36KV) | |
mm | mm | mm | mm | mm | mm |
70 185 | 2.5 | 3.4 | 4.5 | 5.5 | 8.0 |
240 | 2.6 | 3.4 | 4.5 | 5.5 | 8.0 |
300 | 2.8 | 3.4 | 4.5 | 5.5 | 8.0 |
400 | 3.0 | 3.4 | 4.5 | 5.5 | 8.0 |
Above 500 | 3.2 | 3.4 | 4.5 | 5.5 | 8.0 |
Insulaton Screen: Extruded layer of semi-conducting cross-linkable compound is
applied over the insulation. The extruded semi-conducting layer
shall consist of bonded or cold strippable semi-conducting compound
capable of removal for jointing or terminating. As an option, a
semi -conducting tape may be applied over the extruded
semi-conducting layer as a bedding for the metallic layer. The
minimum thickness is 0.3 mm and the maximum resistivity is 500
Ohm-m at 90°C. The screen is tightly fitted to the insulation to
exclude all air voids and can be easily hand stripped on site. Inner Covering & Fillers: For cables with a collective metallic layer or cables with a
metallic layer over each individual cores with additional
collective metallic layers, semi-conducting inner covering and
fillers shall be applied over the laid up cores. The inner covering
is made of non hygroscopic material, except if the cable is to be
made longitudinally watertight. The inner covering shall be
extruded or lapped. The approximate thickness of extruded inner
coverings is given in Table 2:
Table 2. Approximate Thickness Of Extruded Inner Coverings
Ficititous Diameter Over Laid Up Cores | Approx. Thickress of Extruded Inner Covering | |
mm | mm | |
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35 | 45 |