What is the primary advantage of using IS 17048 compliant cables?

In a fire, they produce very low smoke (improving visibility) and do not release corrosive halogen gases, protecting human life and sensitive electronic equipment.

What is the maximum permissible halogen acid gas content?

The halogen acid gas content must be less than 0.5 percent by weight, as per Clause 11.3.1.

What is the smoke density requirement?

The light transmittance during the test shall not be less than 60 percent, as per Clause 11.3.2 and Table 6.

What is the maximum rated operating temperature for the conductor?

The maximum continuous rated conductor operating temperature is 90°C, as specified in Clause 5.1.

IS 17048

: 2018

Halogen-free, low smoke (HFFR) cables for working voltages up to and including 1100 V

CurrentFrequently UsedSpecificationBIMMEP · Electrical Installations

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This standard specifies requirements for Halogen-Free, Low Smoke (HFFR) insulated and sheathed electrical cables for working voltages up to 1100V. It focuses on fire safety by defining critical limits for smoke emission, and corrosive/toxic gas content. These cables are intended for use where safety of life and protection of sensitive equipment is paramount.

Specifies requirements for halogen-free, flame retardant, low smoke cables suitable for fixed electrical installations up to and including 1100 V.

Quick Reference Values

Maximum Conductor Operating Temperature90 °C

Maximum Halogen Acid Gas Emission0.5 %

Minimum Light Transmittance (Smoke Density Test)60 %

Minimum Oxygen Index29 %

Minimum Temperature Index250 °C

Insulation Resistance Constant (Ki) at 90°C0.036 MΩ·km

Practical Notes

The terms HFFR (Halogen Free Flame Retardant) and LSZH (Low Smoke Zero Halogen) are often used interchangeably, and this standard covers such cables.

These cables are critical for use in enclosed public spaces like metro tunnels, airports, hospitals, and high-rise buildings to ensure safe evacuation during a fire.

HFFR cables can be stiffer and more sensitive to moisture during installation compared to traditional PVC cables, requiring careful handling.