static ground alarm

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puckman

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ridgewood, n.j.
does anyone know of an alarm that sounds when you lose a connection?
it is at a truck loading station that you ground the truck being loaded or unloaded. the customer wants a alarm to sound if the truck loses it's ground connection. i beleive the ground connection is provided from a static ground reel that is attached to the all the building steel which is tied back to the main water line at the water meter. thanks for all responses .
 
puckman said:
that was quick marc, ...
Click to expand...
Yeah, sorry it took so long. :wink:

I happened to have that link saved from something else a while back. Wait for the sticker shock, and I hope you don't need more than one.
 
I am in the process of installing 3 of these. They are also marketed here in the US by Stewart Browne. In this model we interlock to the unloading pump or transfer system blower for powered products. We prevent the pump or blower from starting if the bonding connection is not made and if the transfer is in progress and the bonding cable becomes disconnected we stop the transfer system.
As far as preventing static build up the bonding of all of the parts of the transfer system is more important than the actual connection to earth. The movement of product can create a static charge between unbonded parts of the transfer system and when this static is discharged the spark can ignite flammable or explosive mixtures of the product. The interlock on the Earth-Rite is set at 10 ohms. Most of the information that I can find says that if you have a path of 1,000,000 ohms or less, static can not build up.
Don
 
don_resqcapt19 said:
I am in the process of installing 3 of these. They are also marketed here in the US by Stewart Browne. In this model we interlock to the unloading pump or transfer system blower for powered products. We prevent the pump or blower from starting if the bonding connection is not made and if the transfer is in progress and the bonding cable becomes disconnected we stop the transfer system.
As far as preventing static build up the bonding of all of the parts of the transfer system is more important than the actual connection to earth. The movement of product can create a static charge between unbonded parts of the transfer system and when this static is discharged the spark can ignite flammable or explosive mixtures of the product. The interlock on the Earth-Rite is set at 10 ohms. Most of the information that I can find says that if you have a path of 1,000,000 ohms or less, static can not build up.
Don
Click to expand...

Don, we use the Square D model in the same fashion you described it, interlocking the supply or transfer pump.

I looked at the unit that you posted.

UL certifies equipment, not classifies it as the link material stated it. I would be worried that the actual assembled unit is NOT UL certified, but they designed a gizmo and put it in an enclosure that IS UL listed. This happens more often than one would imagine or would like to expect.
 
Laszlo,
You make a good point as I don't see an UL file number on the instructions. They do use the word "certified" in the actual product installation instructions. I didn't get to pick the unit as it was supplied by the client for me to install and hook-up. Also it could just be a language issue as it is a British product.
Don
 
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