Equipment Grounding for De-energized Construction and Maintenance


Importance of  Equipment Grounding for De-energized Construction and Maintenance:


Why grounding Is Require?

Electricity never give you the second chance. So, for safety 99.99% is not enough until 100%. Working with electrical equipment, switch off the power line is not enough for safe; it is very much essential to ensure de-energized the line by grounding.

How Does Grounding Work?

Sometime we even an expert also make mistake to grounding which electricity may get chance to takeaway our valuable life and property. So, no more literature; come and join the Hubbell Power Systems provided video clip to keep safe all of our colleagues:  Video Clip 

What Is Pipe Earthing And Plate Earthing?

Pipe Earthing is the best form of earthing. This is very cheaper than others in cost. In this method of earthing, a galvanized and perforated pipe of approved length and diameter is placed up right in a permanently wet soil.

The size of pipe depends upon the current following amount  to be supposed  and the type of soil condition, dry or wet. If the moisture of soil is very low ( or decreases in Summer ), in such case the resistance of earth is increases.

Plate Earthing an earthing plate of copper of generally dimensions 60cm×60cm×3mm or of galvanized iron of dimensions 60cm×60cm×6mm is buried into the ground with its face vertical to a depth of not less than 3 meter from ground level. High surface area allow the system to allow the high amount of current flow through the earth without any difficulty.

A small masonry brick wall enclosure with a cast iron cover on top or an RCC pipe round the earth plate is provided to facilitate it .


Specifications for Earth Electrodes

Generally we follow the following Earth Electrode specifications:

The earthing electrode should not be placed near the building whose installation system is earthed more than 1.5 m away. 


The resistance of the earth wire should not be more than 1 ohm. 


The wire use for electrode and circuit should be made up of the same material. 


The electrodes should be placed in vertical position so that it can touch the layers of the earth.


Better to select the size of the conductor should not be less than 2.6 sqmm or half of the wire used for electrical wiring. Bare copper wire is used for earthing and grounding for it's long lasting and good conductive properties. Green 6 THHN (Thermoplastic high heat neutral coating wire) and gauged copper wire of different sizes like 2,4,6,8 etc. are also used for earthing and grounding.


Comments

  1. Equipment grounding is essential,
    without grounding it's a killer.

    ReplyDelete

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