Page 24 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 4: Practice the use of discharge rod

Objectives

At the end of this exercise you shall be able to
• identify the discharge rod, check the voltage and insulation class of discharge rod
• practice the use of discharge rod in electrical power supply lines
• follow the safety precautions while using discharge rod.
Requirements

Tools/Equipments/Instruments Materials/Components
• Combination Plier 165mm, • PVC copper wire with crocodile
insulated - 1 No. clip 6 sq.mm - 25 ft.
• Screw driver 200 mm, insulated - 1 No. • Test lamp 100 W, 230 V - 1 No.
• Neon Tester 100mm, 500 V - 1 No. • Capacitor Any value - 1 No.
• Discharge rod, fiber • Emery paper - 1 Sheet
insulated 10 feet, 11KV - 1 No. • Insulation tape - 1 role
• PPE kit as per standard - 1 Set

Procedure

About Discharge rod
A discharge rod (Also known as earth rod) is a safety device used to discharge the static charge acquired in dead
high tension lines, Bus- bars and cables after disconnecting the main power supply line. Discharge rod ensures
life safety and treated as a life saving device. Discharge rod is made up of strong fiber / glass insulated material
with extension handle and available in different sizes up to 10 to 20 ft. It is used to discharge the static charge
acquired in HT lines & LT lines, Bus-bar panels & cables, power transformers, etc after switching OFF the main
supply line during Electrical maintenance / repair work.
Note: The use of discharge rod is limited to experienced and authorized Electrician only. The trainees
shall never attempt to use the discharge rod in HT lines.

TASK 1: Check the Parts & rating of discharge rod.
1 Check and identify the parts of discharge rod.
2 Check the voltage & insulation class of discharge rod.
3 Connect the PVC earth wire to the steel U hook of discharge rod.
4 Identify the earthing point, check and ensure the earth continuity with test lamp.

TASK 2: Practice the use of discharge rod
1 Wear the proper PPE’s before the use of discharge rod.
2 For demo purpose practice the use of discharge rod on LT panel / cables of 3 Ph. 415 V AC

3 Switch OFF the LT breaker and ensure that No power supply in LT panel & cables. (Confirm by noticing lights,
fans and other equipments goes OFF once LT breaker is switched OFF)
4 Firmly connect the earth wire of discharge rod to the terminals of ground / earthing point.
5 Now hold the discharge rod and touch its steel hook to line bus bars of LT panel & power cables including
neutral terminal of LT panel.
6 Also connect the discharge rod on capacitors, CT & PT terminals connected to line bus bars.
7 Remove the discharge rod from line bus bars, and confirm the discharge of static charge by testing with neon
tester.

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