N2XS(FL)2Y 1x70 RM/16 12/20 kV
IEC nominal calculation, not manufacturer data. The thicknesses are the nominal values of the construction standards, added up layer by layer. A manufacturer's cable of the same name can differ by a few millimetres and by 10 to 20 % in weight: always check its datasheet before you specify, order or lay a cable.
By the IEC construction rules, N2XS(FL)2Y 1x70 RM/16 12/20 kV comes to an overall diameter of about 30.6 mm and a weight of about 1,360 kg/km.
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Main dimensions
| Conductor | Copper 70 mm² RM, Ø 9.8 mm | IEC 60228 class 2 compacted, middle of min / max |
|---|---|---|
| Insulation | XLPE 5.5 mm | IEC 60502-2:2014 Tables 5-7, nominal insulation thickness |
| Diameter over insulation | 22.0 mm | |
| Overall diameter | 30.6 mm | |
| Weight (approximate) | 1,360 kg/km |
Round conductors (IEC 60228 class 2 compacted; class 1 solid up to 10 mm²).
Layer by layer (inside out)
| # | Layer | Material | Thickness mm | Ø over mm | Source | How firmly |
|---|---|---|---|---|---|---|
| 1 | Conductor screen (semicon) | Semiconducting | 0.6 | 11.0 | TKF at least 0.5 mm, Nexans under 1 mm | typical value, no rule |
| 2 | Insulation | XLPE | 5.5 | 22.0 | IEC 60502-2:2014 Tables 5-7, nominal insulation thickness | read in the standard |
| 3 | Insulation screen (semicon) | Semiconducting | 0.8 | 23.6 | TKF 0.8 mm, Nexans about 1 mm | typical value, no rule |
| 4 | Swelling tape (water block) | Swelling | 0.3 | 24.2 | typical swelling tape 0.30 mm; a wound tape at most 70 mm wide | typical value, no rule |
| 5 | Wire screen | Copper | 42 wires of 0.70 mm, 16 mm² | 25.8 | copper wire screen: wires at least 0.5 mm (0.7 mm, thicker when the section does not fit), 0.1 mm counter-helix tape | typical value, no rule |
| 6 | Swelling tape (water block) | Swelling | 0.3 | 26.4 | typical swelling tape 0.30 mm; a wound tape at most 70 mm wide | typical value, no rule |
| 7 | Laminate (radial water block) | Aluminium | 0.2 | 26.8 | typical aluminium laminate bonded to the sheath | typical value, no rule |
| 8 | Sheath | PE | 1.9 | 30.6 | IEC 60502 clause 13 / 14.3, oversheath: 0.035 D + 1.0 mm, D the fictitious diameter (Annex A) | read in the standard |
Diameters add up the nominal layers. Where IEC 60502 sizes a layer by the fictitious diameter of its Annex A, the calculated diameter is used instead, which can move a value one step. Sources and page numbers: research/mv-dimensions in the site repository.
Materials in this cable: Copper, Aluminium, XLPE, PE, Semiconductive compound
Weight, by part
| Conductors | 630 kg/km |
| Metal screens and armour | 190 kg/km |
| Insulation, semicon, tapes, fillers and sheaths | 540 kg/km |
| Total | 1,360 kg/km |
|---|
Each layer's cross-section times its density; stranded conductors, laid-up cores and helical wires count 2 % longer than the cable. Densities: copper 8.89 and aluminium 2.703 g/cm³ (the values of IEC 60028 and IEC 60889); XLPE 0.92, PE 0.94, PVC 1.45, semicon 1.12, steel 7.85 g/cm³ (usual compound values).
N2XS(FL)2Y 1x70 RM/16 12/20 kV: equivalents in other countries
Shown for 1x70/16 12/20 kV. Each country's rules are applied to this build, keeping the conductor, section, cores, voltage, screen, armour and sheath.
| Country | Standard | Name in that country | Verdict | Differences |
|---|---|---|---|---|
| Netherlands | HD 620 S3 10-J | YMeKrvasdlwd 12/20 kV 1x70 rs +as16 (key read from a maker (Nedkab), the NEN text not seen) | Equivalent | Insulation screen (semicon) 0.6 → 0.8 mm; Overall diameter 31.35 → 31.75 mm |
| Sweden | HD 620 S3 10-M | FXCLJ-TT 1x70/16 12/20 (24) kV (NKT writes a near build without the C (AXLJ)) | Close | Sheath 2.5 → 1.9 mm; Overall diameter 31.35 → 30.15 mm |
| Denmark | HD 620 S3 10-D | no letters for this build | Close | Insulation screen (semicon) 0.6 → 0.8 mm; Sheath 2.5 → 1.9 mm; Overall diameter 31.35 → 30.55 mm |
| Norway | HD 620 S3 10-K | TSLF 24 kV 1 x 70 mm2 (provisional code designation of HD 620 10-K Table 4; F is a PE sheath with an outer conducting layer, which this build does not draw) | Close | Insulation screen (semicon) 0.6 → 0.8 mm; Sheath 2.5 → 1.9 mm; Overall diameter 31.35 → 30.55 mm |
| International (IEC) | IEC 60502 | Cu/XLPE/CWS/PE 1x70/16 12/20 kV (to IEC 60502-2) | Close | Insulation screen (semicon) 0.6 → 0.8 mm; Sheath 2.5 → 1.9 mm; Overall diameter 31.35 → 30.55 mm |
No equivalent in: BS 6622 (armoured cables only).
Nominal values computed by each standard's rules, not manufacturer data. This is not a statement that two cables are interchangeable: the buyer's specification and the maker's type test decide.