What are the basic principles of ED?

What are the basic principles of ED? 
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1 Answer

Answer :

Basic principles of ED are,

a) All the contacts of corresponding relays and contactors are shown in de-energised condition.

b) Control circuit gives us idea about ON / OFF selection of motor, fuse rating, forward reverse

control, seal in protections etc.

c) Power circuits are drawn in thick lines and control circuits are drawn in thin lines.

d) When relay or contactor energises normally open contact closes and normally closed contact

opens.

e) Auxillary contacts acts with main device such as contactors and relay. 
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