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I have to design a grounding system for four steel tanks at ground level.System parameters: 480v/277v,fault level 50 KA at 480V.The tanks are of 20 ft dia and placed at 50 ft center to center to each other.I need yr suggestions for the size cable ,no.and dia of ground rods,ground grid information.

Hv a coil of 10,000 turns on a core and pass 1A. U will have 10000 amp turn field.But what is the application your customer is needing this?

I have 20 pipe lines of average lengths about 100 ft and dia of 2 in with liquid temp 150F to be freeze protected above 40F.Can i use one thermostat and have ambient set at 40F and switch all 20 heat tracing circuits(Self regulating heat tapes) from a powersupply panel?

What is the 3.3 kv system fault level?I suspect 3.3KV system is resistance grounded.U dont have a breaker to be tripped by 50/51/50G.If the motor is used for an application where in the system fault level is low and within contactor ratings then the application of MPR may be more meaningful.