Grounding of Industrial process equipment

[mshields]

Working on a Water Filtration system for a pharmaceutical company. And we're debating whether or not to put a ground grid under the slab and to come out of the slab in two place to each piece of process equipment. This, of course, is in addition to the grounding via the feeder to the equipment.

While I've seen such grounding, I'm wondering what it buys you? the breaker is going to trip due to a ground fault because the current will flow back to the source via the ground included with the feeder - right?

Would appreciate any feedback on this.

Thanks,

Mike

 

[barbeer]

I would make sure you are not violating 250.58

 

[mshields]

250.58

250.58

Don't think that this paragragh poses an issue since the ground grid we are putting in would be tied into building steel in multiple places. Hence, we'd still have only one grounding electrode system.

But thanks - I didn't explain that in the initial question.

Mike

 

[petersonra]

What possible benefit would you gain?

Unless you consider the waster water pond a pool.

 

[ghostbuster]

This style of underfloor/under concrete ground grid system is used many times in computer room installations. There are many technical articles published by server computer mfrs and technical magazines discussing the merits.(try googling,EC/M and consulting engineering mag for info etc.)