<ul>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#212529">Earthing is the first step towards electrical safety. The body of electrical equipment, appliances etc is to be connected to the earth for safe discharge of electric current, in the event of any leakage, fault etc. The earth is considered to be zero potential. Earthing is done to provide safety to users from electric shock.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">There are various types of earthing like plate earthing, pipe earthing and strip earthing. Nowadays in robots, <strong>chemical earthing</strong> is preferred.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">Chemical earthing is considered to be the most effective solution for consistent and permanent earthing. They are maintenance-free and have minimum fluctuations and are eco friendly. They are highly reliable for the safety of human life and have more surface area of conduction.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">international standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT and IT The first letter indicates the connection between the earth and the power supply equipment. ( transformer or generator)</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">T - Indicates one or more points of the supply are directly earthed ( For example, earthed neutral of the transformer ) I - Indicates either that the supply system is not earthed at all, or that the earthing includes a deliberately inserted impedance, the purpose of which is to limit the fault current. The second letter indicates the connection between the earth and the electrical device being supplied:</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">T - All exposed conductive metal-work is directly connected to the earth, independent of any other earth connection in the supply system.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">N - All exposed conductive metal-work is connected directly to an earthed supply conductor provided by an Electric supply.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333"><strong>The third and fourth letters</strong> indicate the arrangement of the earthed supply conductor system.</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">S - Neutral and Earth conductor systems are quite separate</span></span></li>
	<li style="list-style-type: disc; text-align: justify;"><span style="font-size:14px"><span style="color:#333333">C - Neutral and Earth are combined into a single conductor</span></span></li>
</ul>