7L2.5
7L2.5 is a Mineral insulated cables (MICC, IEC 60702-1 grades) cable designation: L = Light duty grade, 500 V (300/500 V): mineral insulated copper cable; the number before the letter counts the cores, the number after it is the conductor in mm2; 7L2.5 = 7L2.5: mineral insulated copper cable, light duty 500 V, 7 x 2,5 mm2, 9.7 mm over the copper sheath (11.4 mm with the LSZH covering). 300/500 V; copper sheath 70 C covered or exposed to touch, 105 C bare and out of reach. IEC 60702-1 / BS EN 60702-1 (as the makers cite it; not held here).
1 coding system recognises this code
Mineral insulated cables (MICC, IEC 60702-1 grades)
| Symbol | Meaning |
|---|---|
L | Light duty grade, 500 V (300/500 V): mineral insulated copper cable; the number before the letter counts the cores, the number after it is the conductor in mm2 |
7L2.5 | 7L2.5: mineral insulated copper cable, light duty 500 V, 7 x 2,5 mm2, 9.7 mm over the copper sheath (11.4 mm with the LSZH covering). 300/500 V; copper sheath 70 C covered or exposed to touch, 105 C bare and out of reach. IEC 60702-1 / BS EN 60702-1 (as the makers cite it; not held here) |
What is 7L2.5 cable?
7L2.5: mineral insulated copper cable, light duty 500 V, 7 x 2,5 mm2, 9.7 mm over the copper sheath (11.4 mm with the LSZH covering). Rating: 300/500 V; copper sheath 70 C covered or exposed to touch, 105 C bare and out of reach. Standard: IEC 60702-1 / BS EN 60702-1 (as the makers cite it; not held here).
Documents and pages the readings were taken from
- Wrexham Mineral Cables, Wrexham Mineral Cables catalogue, Standard Conductor Cable tables, pp. 20 to 21: https://electricaldirect-assets.s3.amazonaws.com/product-documentation/technical/835702.pdf [seen: manufacturer]
- nVent Pyrotenax, nVent Pyrotenax MI Wiring Cable System brochure, Pyro MI Cable System Data, p. 10: https://www.topazfiresystems.com/images/special-systems/micc/MICC%20Cable.pdf [seen: manufacturer]
- KME Italy, KME Italy MICO mineral insulated cables brochure, Cable technical data, p. 10: https://www.kme.com/fileadmin/DOWNLOADCENTER/COPPER%20DIVISON/6._Mineral_Insulated_Cables/Mineral_Insulated_Cables_Manuals_KME_Italy_Spa/Brochure_KME_Italy_MICO_Mineral_Insultated_Cables.pdf [seen: manufacturer]
Mineral insulated cables (MICC, IEC 60702-1 grades): how to read the cable type names
7L2.5 as the cable designer builds it, 7x2.5 300/500 V
Overall diameter 9.7 mm, about 420 kg/km. Nominal values from the standard's tables for this size, computed, not a maker's data.
| Layer | Material | Thickness, mm | Over the layer, mm |
|---|---|---|---|
| Insulation | Compressed magnesium oxide (MgO) | 0.52 | 2.8 |
| Metal sheath (lead or smooth aluminium) | Copper | 0.61 | 9.7 |
7L2.5 on a drum
The smallest drum that passes every check, for 9.7 mm and about 420 kg/km as the cable designer builds it. Drums as their makers print them; lengths are estimates: whole layers wound nested (each turn in the groove of the layer below), wound diameter 1.05 × OD, 50 mm freeboard under the flange rim. Cable makers' own tables print less, as they count aligned layers.
| Length | Drum size (its makers) | Layers | Gross weight |
|---|---|---|---|
| 500 m | KTG 6 (630 mm flange), wood KTG drums (Europe), Meinhart Kabel, Partner Cable | 14 of 15 | 223 kg |
| 1,000 m | KTG 9 (900 mm flange), wood KTG drums (Europe), Bayka, KTG | 11 of 19 | 467–471 kg |
Barrel at least 15 × OD = 146 mm for a cable of this kind (Low voltage, multi-core): KTG table, the cable's datasheet wins. A load rating is the drum maker's own.
Other lengths, drums and weights: the cable drum calculator
Load it on a truck: 1000 m on its drum in the loading planner
Laying, sizes and datasheet: 7L2.5
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Work with 7L2.5
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