Question

Which of the following is NOT one of the materials used for HT (11 kV) and LT (415 V) distribution lines?
1. Guarding wires
2. Anticlimbing devices
3. Street viewing light fittings
4. Danger sign boards

Answer 1

Correct Answer - Option 3 : Street viewing light fittings

Guarding:

• A guarding is provided for the safety of life, installation, and communication circuits.
• The guarding for 11 kV lines is provided at road crossings, canal crossings, railway crossing, crossing over lt lines, or communication lines.
• Regarding guarding of line crossings or approaching each other IER 87 provides all-important guidelines, IER (Indian Electricity Rule) 88 provides that every guard wire shall be connected with the earth at each point at which electrical continuity is broken.
• Every guard wire should have sufficient current-carrying capacity to ensure the circuit renders dead, without risk of fusing of the guard wire or wires till the contact of any line wire has been removed. 

 

Anticlimbing devices:

• The anti-climbing device is a part of the fencing panel system, which is mounted on fencing upright.
• These are basically used at sub-station fencing, Defense fencing,or any high-security areas where barbed wire is required to secure the required zone/perimeter.

 

Street viewing light fittings:

• Street lighting is part of secondary distribution used for different purposes.
• Generally, these are designed to operate at the voltage of 90 to 270 V.
• So, in general, there is no presence of street viewing light fittings on LT and HT lines.