Grounding diesel fuel tank 15,000 gallons.

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planas

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What section of N.E.C. apply to this subject?. What bonding conductor size ?. Please need help.
 
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planas said:
What section of N.E.C. apply to this subject?. What bonding conductor size ?. Please need help.
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I am not entirely sure just what it is you are asking. Perhaps you could elaborate.

What makes you think it needs to be bonded in the first place?
 
Diesel fuel is not considered flammable, so there are not rules specific to diesel in the NEC. There may be another NFPA standard that applies.
Why does it need to be bonded?
 
What kind of tank is it? If it is mounted in or on the ground it is already grounded. If it needs to be bonded, that may be done via the grounding conductor of the circuit that is likely to energize the tank.
 
I found a NFPA document (back in the early 80's) that addressed this issue. I don't remember which one, but the basic idea was two ground rods on opposite ends/corners of the tank. A number 8 wire from the tank to the ground rods.

After looking in NFPA 30 and 30A, I believe you want to review NFPA 77.
 
hardworkingstiff said:
I found a NFPA document (back in the early 80's) that addressed this issue. I don't remember which one, but the basic idea was two ground rods on opposite ends/corners of the tank. A number 8 wire from the tank to the ground rods.

After looking in NFPA 30 and 30A, I believe you want to review NFPA 77.
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The OP used the term "bonding" rather than grounding.
 
hardworkingstiff said:
Oops, so they did. Thanks Peter!

Edit: Well, the title uses "grounding" and the subject field uses "bonding".
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yes it does.

IMO, most metal storage tanks are pretty much effectively grounded because they sit on concrete pads that are in direct contact with the earth any way, and are often bolted into those concrete pads.

how would driving in two more ground rods improve on that?
 
The general grounding and bonding rule is found in Section 250.4(A)(4). The key element is “…likely to become energized.”

If it is "... likely to become energized,” then the general bonding rule is in Section 250.90 with specific application of Section 250.104(C) and/or (D)(2) as applicable to the OP. I tend to use Section 250.110 as a strong guide to what is “…likely to become energized” as well as what must be grounded.

Edited the elipsis-rbalex
 
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