Solid round copper-bonded steel earthing conductor, diameter 18 mm, cross-section 254.5 mm², with a copper layer of not less than 250 µm bonded to a low-carbon steel core. The 250 µm copper layer is the grade for conductors in soil, for ring electrodes, earth grids and risers of the LPS earth termination.
18 mm Diameter | 254.5 mm² Cross-section | 250 µm Copper layer | 2.013 kg/m Mass |
Why this conductor
- Right grade for soil. Copper layer of not less than 250 µm, the grade IEC 62561-2 and IS/IEC 62305-3 Table 7 call for in soil.
- Steel strength, copper surface. The steel core holds its line in trenches and risers; the bonded copper does not separate on bending.
- Section shown. 254.5 mm² with a 1 s current of about 20.9 kA on the steel core basis.
- Easy to handle. 2.013 kg/m, about 201 kg per 100 m coil.
- Theft deterrent. Low scrap value compared with solid copper.
Joints and contact in soil
Make buried joints by exothermic weld, seal cut ends, and never connect bare GI or aluminium to the conductor in soil; make that transition above ground at the test clamp.
Specifications
| Electrical Parameters |
| Material | Copper-bonded steel |
| Material Grade | Low-carbon steel core, bonded electrolytic copper 99.9 % |
| Copper Layer | Not less than 250 µm |
| DC Resistance at 20 °C | About 0.39 ohm/km |
| Electrical Conductivity | About 17 % IACS |
| Short-Circuit Current (1 s, steel core basis) | About 20.9 kA, k = 82, 500 °C final |
| Mechanical Parameters |
| Conductor Type | Round, solid |
| Diameter | 18 mm |
| Cross-Section | 254.5 mm² |
| Mass per Metre | 2.013 kg/m |
| Bend | 90 degrees over 5 x diameter, no cracks or peeling |
| Tensile Strength | Steel core value on the mill test certificate of each coil |
| Standards and Certification |
| Applicable Standard | IEC 62561-2 |
| Indian Standard | IS 18925-2 (IEC 62561-2) |
| Minimum Cross-Section Check | IS/IEC 62305-3 Table 7: 50 mm² minimum for copper coated steel, complies |
| Building Code | National Building Code of India, NBCS 2026, Part 8 Section 2 |
| Safety Regulation | CEA (Measures relating to Safety and Electric Supply) Regulations 2023 |
| Quality System | ISO 9001:2015 certified; CE marked; RoHS compliant |
| Finish and Supply |
| Surface | Bright copper, metre marks every 1 m; lot tag |
| Supply Form | Open (cut to length), Coil 100 m or Bar 5 m |
| Unit of Sale | Metre (m) |
| Minimum Web Order | 1000 m |
| Application and Installation |
| Used For | Buried LPS earth termination: Type B ring electrodes, earth rod interconnections, earth grids and mats, risers to test joints and column studs, conductors in concrete; 250 µm is the soil grade of IEC 62561-2 and IS/IEC 62305-3 Table 7 |
| Joints | Exothermic weld in soil; copper-bonded or stainless steel clamps above ground |
| Do Not Use In | Driven or dragged installation that scrapes the copper layer; unsealed cut ends in soil; direct contact in soil with GI, bare steel or aluminium; acidic, ammoniacal or sulphurous soils and cathodic protection sites without specialist advice |
| Product Identification |
| Product Code | LPES-ECN-RD-CB-18 |
| Product Number | 32-04-03-07-000180-0000-03 |
