IS 694 Standards for 3 x 0.5 sq mm Wire
In low-voltage power distribution and control wiring, IS 694 is the foundational Indian Standard governing PVC insulated and sheathed cables up to 1,100V. For applications like control panels, appliances, lighting, instrumentation, and wiring harness assemblies, choosing the correct conductor size (sq mm), number of cores, insulation type, and sheath compound is critical for safety, durability, and compliance.
This guide explains IS 694 compliance for 3 x 0.5 sq mm cables (example configuration) and shows how the same framework applies to multiple cross-sections and core counts (2C, 3C, 4C; 0.5 / 0.75 / 1.0 / 1.5 sq mm and beyond).
1. Understanding IS 694 (Indian Standard for PVC Cables)
1.1 What is IS 694?
IS 694 specifies construction, materials, dimensions, electricall, and fire performance for PVC insulated and sheathed cables rated up to 1,100V. It defines requirements for:
Conductor class (as per IS 8130)
Insulation and sheath compounds (as per IS 5831)
Temperature ratings (70°C, 85°C HR)
Flame-retardant (FR) and FR-LSH options
Marking, testing, and acceptance criteria
1.2 Why IS 694 Matters
| Risk | Non-Compliant Cable | IS 694 Compliant Cable |
| Overheating | Insulation softening | Rated temperature performance |
| Fire spread | Rapid flame propagation | FR / FR-LSH options |
| Durability | Cracking, ageing | Verified ageing & tensile retention |
| Compliance | Market restrictions | Project & tender eligibility |
2. Example Configuration: 3 x 0.5 sq mm Cable (Multi-Core)
2.1 Typical Construction
Conductor: Annealed copper, Class 5 (flexible) as per IS 8130
Insulation: PVC Type C or D (as per IS 5831)
Sheath: PVC ST-2 / ST-3 (FR / FR-LSH as required)
Cores: 3 (including optional green-yellow earth)
Voltage Grade: Up to 1,100V
2.2 Where 3 x 0.5 sq mm is Used
Control wiring in panels
Sensors and actuators
Small appliances
Lighting circuits
Low-current instrumentation
3. Variants Available (As per IS 694 / IS 8130 / IS 5831)
3.1 Product Type vs Specifications
| Product Type | Specifications |
| PVC 70°C | IS 694, IS 8130 Class 5, IS 5831 Type D (Insulation) & ST-3 (Sheath) |
| Heat Resistant 85°C | IS 694, IS 8130 Class 5, IS 5831 Type C (Insulation) & ST-2 (Sheath) |
| Flame Retardant (FR) | IS 694, IS 8130 Class 5, IS 5831 Type D (Insulation) & ST-3 (FR Sheath) |
| Heat Resistant 85°C + FR | IS 694, IS 8130 Class 5, IS 5831 Type C (Insulation) & ST-2 (FR Sheath) |
| FR-LSH (Low Smoke Low Halogen) | IS 694, IS 8130 Class 5, IS 5831 Type D (Insulation) & ST-3 (FR-LSH Sheath) |
3.2 Part Number Suffix Logic (Example Framework)
Insulation Colour (XX): 06 = Green/Yellow earth core (standard), 00 = Without earth (on request)
Product Type (Y): 1 = PVC 70°C, 2 = PVC FR 70°C, 3 = PVC HR 85°C, 4 = PVC HR 85°C + FR, 5 = PVC FR-LSH 70°C
Sheath Colour (Z): 1 = Black, 4 = Grey
💡 Tip: Keep suffix logic consistent across sizes (0.5 to 2.5 sq mm) and cores (2C/3C/4C) for ERP and BOM clarity.
4. Electrical & Mechanical Requirements (IS 694)
| Parameter | Requirement |
| Conductor Resistance | As per IS 8130 limits |
| Insulation Thickness | As per IS 694 nominal values |
| Sheath Thickness | As per IS 694 nominal values |
| High Voltage Test | No breakdown |
| Insulation Resistance | Meets specified MΩ·km |
| Tensile & Elongation | Post-ageing retention within limits |
5. Fire Performance Options (FR / FR-LSH)
| Option | Benefit | Typical Use |
| FR | Self-extinguishing, reduced flame spread | Panels, appliances |
| FR-LSH | Low smoke, halogen-free fumes | EVs, public spaces, OEM safety builds |
6. Manufacturing & Quality Control at Celestix
Incoming copper rod & compound validation
Stranding as per Class 5 flexibility
Online spark testing during extrusion
Dimensional checks (insulation/sheath)
High-voltage and IR testing
Batch-wise flame tests (FR / FR-LSH)
Marking & traceability for OEM supply
7. How to Extend This Standard to Other Sizes & Cores
You can replicate the same IS 694 framework for:
Cross-sections: 0.5, 0.75, 1.0, 1.5, 2.5 sq mm
Cores: 2C, 3C, 4C (with/without earth)
Applications: Control cables, appliance cords, internal wiring harnesses
8. Compliance & Certifications
| Standard | Coverage |
| IS 694 | PVC insulated & sheathed cables |
| IS 8130 | Copper conductor class |
| IS 5831 | PVC compound types |
| RoHS | Restricted substances |
| REACH | Chemical safety |
| ISO 9001 | Quality management |
| IATF 16949 | Automotive-grade processes |
Conclusion
For 3 x 0.5 sq mm multi-core cables, IS 694 defines the blueprint for safe construction, electrical performance, and fire behavior. By selecting the right PVC grade (70°C / 85°C HR), FR or FR-LSH sheath, conductor class, and colour coding, OEMs can ensure long-term reliability and compliance.
Celestix Industries India Pvt. Ltd. manufactures IS 694-compliant multi-core cables and harness-ready wire solutions for appliances, panels, EVs, and industrial systems.
