30 foot ground rod

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dscott1

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Recently reviewing dwgs for aircraft hanger.
AE specked 3/4" - 30'long (foot) ground rod.
Ground rod attached to static grounding point receptalce with bronze body.
Have never seen this system used for aurcraft static ground point.
Have seen system used in salt water areas in ship yards.
What would be the reason for using this system for an aircraft hanger?
Thanks for any answers.
 
1. The AE is uninformed and doesn't know any better.
2. The AE likes to waste valuable materials and man hours.
3. The AE owns the mineral rights underneath the hanger and hopes you hit oil.
4. All the above.

What is a static grounding point receptacle?
 
bphgravity said:
1. The AE is uninformed and doesn't know any better.
2. The AE likes to waste valuable materials and man hours.
3. The AE owns the mineral rights underneath the hanger and hopes you hit oil.
4. All the above.

What is a static grounding point receptacle?
Click to expand...

Uhh, that will be #4 Bryan :D

Roger
 
At the naval air station on Whidbey Island there is a 750 MCM copper static grounding grid under the parking aprons. Ground rods are often used for static grounds to prevent sparks when fueling. Its the same reason why when filling a metal gas can you set it on the ground.
 
Pierre, the basic problem here is the gross overkill of a 30' ground rod for the purpose.

Roger
 
roger said:
Pierre, the basic problem here is the gross overkill of a 30' rod for the purpose.
Click to expand...

I wish I could remember the extremely high resistance value that Don has posted before that is capable of draining away static.
 
OK I see what you are saying and I recall the information from Don, it was 1,000 ohms if not a lot more.
Now in defense of the AE, they may have some boiler plate drawings that uses 30ft GR because....there may not be a good sound reason, but because.
 
Bob,
The IEEE green book says that 1,000,000 ohms will prevent the buildup of static charges. In my opinion the transfer of fuel is another case where bonding is more important than grounding.
 
Once, when I was in the service, we were supposed to go out and drive 3 or four 40' ground rods for the base distribution system with a jackhammer. For what, I don't know.

They were 10' long sections with a bolt head that you were supposed to unscrew and then couple the next section. You had to drive them from the bucket truck.

It's a good thing they work horizontally as well as vertically, because much of them are in the swamp... I guess you would have had to connect a wire to them, though.:)
 
bphgravity said:
1. The AE is uninformed and doesn't know any better.
2. The AE likes to waste valuable materials and man hours.
3. The AE owns the mineral rights underneath the hanger and hopes you hit oil.
4. All the above.
That's funny - but you're right.


What is a static grounding point receptacle?
Click to expand...
The point where parked aircraft if grounded.
 
Maryland State Cert. Electrical Inspector

Maryland State Cert. Electrical Inspector

Thanks to all for the replys.
Have to agree it appears to be AE overkill.
Ground grid would serve the purpose as there are several points in and around hanger to pick up.
 
dscott1 said:
Recently reviewing dwgs for aircraft hanger.
AE specked 3/4" - 30'long (foot) ground rod.
Ground rod attached to static grounding point receptalce with bronze body.
Have never seen this system used for aurcraft static ground point.
Have seen system used in salt water areas in ship yards.
What would be the reason for using this system for an aircraft hanger?
Thanks for any answers.
Click to expand...

One possible answer would be poor soil conductivity until you got 20 feet deep.
 
receptacle

receptacle

i don't know about the 30' ground rod except for the fat that static electricity does not have the same dissipating properties as ac current however the grounding receptacle is nothing more than a point of attachment for an aircraft
 
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