Manufacturing Plant – Surge & Earthing Issues


A 4 decade old leading manufacturer of sheet metal components of electrical machines with sophisticated automatically operated CNC machines and robot machines wanted us to suggest the suitable surge protection devices for their factory and to study the existing earth pits on their factory premises aimed at protecting their assets.

Key Issues:

Addressing the Issues:


  1.  IS/IEC62305 part 3 - Physical Damage to Structures and Life Hazard under clause 5.4.1 recommends the use of single integrated earth-termination system for lightning protection, power systems and telecommunication systems. Hence the earth pits of LPS shall be interconnected with the earth pits of other equipment.
  2. IS732 - Code of Practice for Electrical Wiring Installations under clause also states that “all earth electrodes associated with a building, for example, protective, functional and lightning protection, shall be interconnected“

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