Power sector cable
LT panels, substation control, solar AC output, and captive plant motor feeders: cable choice follows voltage, fire class, CEA rules, and the single-line — each application maps to a defined product family.
Governing standards
Applications in this sector
Domestic supply
| Application | Cable | Specification |
|---|---|---|
| LT panel, MCC, distribution board wiring | FR Single Core WireIS 694:2010 | BIS IS 694:2010 certified; Class 2; 1.5–240 mm² |
| Control room, cable galleries, DCS/PLC panels | FR-LSH Single Core WireIS 694:2010 | OI >29%; CEA specified for dense cable gallery runs |
| Protection relay panels, SCADA, inter-panel control | Control CableIS 694:2010 | 2–24 cores; Class 5 flexible; screened option for EMI-sensitive environments |
| Motor starters, VFD connections, flexible runs | Single Core Flexible WireIS 694:2010 | Class 5 fine-stranded; 0.75–240 mm² |
| Submersible borewell and sump pump motors | Flat Submersible CableIS 694:2010 | 3-core flat; Class 5; continuous submersion; 1.5–6 mm² |
| HVAC, BMS, instrumentation loops | Multicore Flexible CableIS 694:2010 | PVC insulated & sheathed; 2–24 cores; Class 5; FR grade |
| LSZH control rooms, DAQ wiring | LSZH / HFFR WireIS 17048:2018 | HCl <0.5%; smoke ≥70%; for manned control rooms where halogen limits apply |
NYY-J / NYY-O (IEC 60502-1) and H07V-U / H07V-K (IEC 60227-3) for power and distribution projects in Africa, the Middle East, and Southeast Asia. NYM-J (DIN VDE 0250) for GCC and African market general wiring.
View export & international standards →Reference clients
Related sectors
Power & energy cable specification — common questions.
What utility procurement teams, NTPC / NHPC specifiers, and substation EPC contractors typically ask.
What does CEA Technical Standards 2010 require for power station LT panel wiring?
CEA Technical Standards 2010 specifies IS 694:2010 for LT internal wiring and control cable in power station buildings. FR is the minimum specification for general control and instrumentation. FR-LSH or LSZH is required in control rooms, dense cable galleries, and substation trenches where cable density raises fire and smoke risk.
Many NTPC / NHPC-class specifications upgrade to FR-LSH or LSZH on enclosed routes per IS 694:2010 Amendment 1. National Cables supplies both grades with CEA-compliant documentation.
Why are dense cable galleries required to use FR-LSH or LSZH instead of plain FR?
Dense bunched cables in trays and trenches multiply the fire load. A single-cable flame test (IEC 60332-1-2:2004) is not sufficient evidence for grouped installations. Dense routes therefore require:
- FR-LSH minimum for smoke and halogen control during a fire
- LSZH (IS 17048:2018) with HCl < 0.5%, smoke transmittance ≥ 70%
- IEC 60332-3-24:2018 Category C evidence — bunched cable flame-spread limit 1.5 L/m fuel
LSZH ensures operator visibility for emergency egress in enclosed control rooms and cable basements.
Which utility-sector institutional clients does National Cables supply?
National Cables references the following utility-sector institutional clients (current and historical relationships across decades):
- NTPC Limited — National Thermal Power Corporation
- BHEL — Bharat Heavy Electricals Limited (power plant manufacturing)
- Power Grid Corporation and various transmission utilities
- Department of Atomic Energy (low-voltage admin and non-core building wiring only — reactor-core and radiation-qualified cables are outside our manufacturing scope)
All supply is to documented IS 694:2010 / IS 17048:2018 specifications with BIS licence reference and lot test certificates.
What voltage grade applies to power-station LT and substation auxiliary wiring?
IS 694:2010 1100 V-class covers LT internal wiring in power stations, substation auxiliary panels, and distribution circuits up to 1100 V working. The 1100 V certification provides margin for switching transients common in switchyard auxiliary loops and motor-starting events on station service plant.
For HV cable (above 1100 V), specify a separate HV cable manufacturer — National Cables' scope is LT auxiliary wiring on substations and power-station buildings, not the HV transmission cable itself.
Are National Cables' cables suitable for renewable-energy projects (solar, wind)?
Yes — for the AC building-services portion. IEC 62548 and IEC 60364 govern installation; AC wiring from inverter output to LT panel uses FR or FR-LSH per the project fire strategy. Battery rooms, control rooms, and DG synchronising panels typically specify FR-LSH or LSZH.
For DC string cabling between solar panels and inverters (UV-resistant, dual-rated, often XLPE), specify a solar-DC-rated cable manufacturer — that scope is outside IS 694:2010 / IS 17048:2018 thermoplastic insulation.
Specify National Cables for your power sector project.
CEA-compliant documentation, BIS test certificates, and BOQ-based project pricing — 24-hour response.