Static Bonding

[Chris Rankin]

I have a facility that has free floating ground rods through out there facility for static discharge of metal drum containing paints and solvents. They are not connected to the main ground at any point and only a static line from the 55 gallon drums are attached to it. Don't these ground rods have to be bonded to the main electrical system ground so as to eliminate differances of potential and safety issues? Where can I find references to this issue?

 

[pierre]

Re: Static Bonding

250.54
Which basically says that the supplementary electrode will be bonded to the equipment grounding conductor, which will complete its path back to the source.

Also you can reference NFPA 77 - Recommended Practice on Static Electricity.

 

[don_resqcapt19]

Re: Static Bonding

This is not covered by the NEC. Take a look at NFPA 77. In most cases there is no reason to add any grounding for static control. Bonding connections between the containers and any locally available metal part of the electrical system will control the static build-up.
Don

 

[Chris Rankin]

Re: Static Bonding

Thanks guys for the information.