Your Total Savings ₹10840 What is the maximum allowed earth resistance as per IE Rules 1956?
As per IE Rules 1956, the maximum earth resistance allowed is 5 ohms for low and medium-voltage systems. For the high voltage class, the maximum resistance specified is 1 ohm.
Which IE rule specifies the earthing of street lighting poles and traffic light poles?
Rule 50(2)(v) of IE Rules 1956 specifies that all metal parts of electrical installations, including street lighting poles and traffic light poles, must be effectively earthed.
What is the minimum earth wire size specified in IE Rules 1956?
The IE Rules 1956 specify the minimum earth wire size as 50 sq mm for copper or 75 sq mm for aluminum. This applies to the main earth lead from the first connection of the earth electrode.
Is earthing of neutral mandatory as per IE Rules?
Yes, earthing of the neutral point is mandatory as per IE Rules 1956. Rule 51(2)(iii) specifies earthing of the neutral point for low voltage systems at the source of supply. This is crucial for safety.
What type of earthing system is used for high-rise buildings?
For high-rise buildings, the IE Rules recommend a low-resistance multiple earthing system using several electrodes interconnected and bonded together to achieve a very low earth resistance value of less than 1 ohm.