As per IS, what is the voltage grading of the wire used for domestic wiring?

Explanation:

Voltage Grading of Wire for Domestic Wiring

Definition: Voltage grading refers to the maximum voltage that a wire or cable is designed to safely handle. It is a critical parameter in the selection of wires and cables for electrical installations, ensuring the safety and reliability of the electrical system.

Correct Option Analysis:

The correct option is:

Option 3: 1100 V

According to the Indian Standards (IS), the voltage grading for wires used in domestic wiring is 1100 V. This means that the wires are designed and tested to handle up to 1100 volts of electrical potential, ensuring that they can safely carry the household electricity loads without risk of insulation breakdown or fire hazards.

The 1100 V rating provides a safety margin, considering that the standard voltage in most domestic installations in India is 230 V. This margin ensures that the wires can handle potential surges and fluctuations in voltage, providing reliability and safety for household electrical systems.

Additional Information

To further understand the analysis, let’s evaluate the other options:

Option 1: 230 V

This option represents the standard voltage level for domestic electrical supply in India. However, this is not the voltage grading for the wires but rather the operational voltage of the system. The wires used in domestic wiring need to have a higher voltage grading to ensure safety and reliability, which is why 230 V is not the correct answer for the voltage grading of the wires.

Option 2: 440 V

This option represents a common voltage level for industrial and commercial electrical systems. While it is higher than the standard domestic voltage, it is still not the voltage grading specified by the Indian Standards for domestic wiring. The correct voltage grading is 1100 V, which provides a sufficient safety margin for household electrical systems.

Option 4: 400 V

Similar to option 2, this voltage level is more typical in industrial and commercial settings rather than domestic installations. It is not the standard voltage grading for wires used in domestic wiring according to Indian Standards.

Conclusion:

Understanding the correct voltage grading for wires used in domestic wiring is crucial for ensuring the safety and reliability of household electrical systems. According to Indian Standards, the voltage grading for domestic wiring is 1100 V. This provides a necessary safety margin above the standard operational voltage of 230 V, ensuring that the wires can handle voltage surges and fluctuations without compromising safety. Other options, such as 230 V, 440 V, and 400 V, do not meet the specified voltage grading for domestic wiring, highlighting the importance of adhering to standards for electrical installations.