Industrial Static Grounding / Bonding related to Combustible Dust

[Drowe-safety]

I am working with companies with combustible dust. Most understand that there is an electrical ground in the wiring for pumps, motors, etc. Is there a Code or Standard related to grounding / bonding for static? Machine grounds and / or bonds. Also, how can a facility determine if the ground or bonding system is effective?

Thank you!!

 

[don_resqcapt19]

It is all really bonding. That prevents the static build up. Some documents say that any path of one million ohms or less will be sufficient to prevent the buildup of a static charge, but I believe that NfFPA 77, Recommended Practice on Static Electricity says you should have a maximum of 10 ohms of resistance between any of the parts.

One of the biggest issues has been the use of non-conductive flexible hoses to transport combustible dust.

 

[Drowe-safety]

It is all really bonding. That prevents the static build up. Some documents say that any path of one million ohms or less will be sufficient to prevent the buildup of a static charge, but I believe that NfFPA 77, Recommended Practice on Static Electricity says you should have a maximum of 10 ohms of resistance between any of the parts.

One of the biggest issues has been the use of non-conductive flexible hoses to transport combustible dust.

Thank you!!

I agree with the comment on non-conductive flexible hoses.

NFPA 77 does mention 10 ohms several places. Can this be checked / verified with a standard voltage meter? or is special equipment needed to ensure that the grounding and bonding are actually effective.