Ground Potential Rise

[mbrooke]

Exactly the jist of the article's reference to GPR

>>>>



That nanosecond of GPR is far less damaging if the entire residence assumes 1,000,000 volts

VS. 1,000,000 volts on one end, 500,000 volts on the other, which is FAR more damaging.

One can even read this theory into past code cycles. Remember when we didn't bond gas lines? The gas guys would have conniptions....then it evolved to 'within 6' , along with a flashover rationale. , these days we either bond the gas lines or fail inspections.


~RJ~

Yup- electronics are no different than people in a pool or hot tub. Basically the people/electronics are the high resistance and bonding is the ultra low resistance. The goal is to have most of the voltage drop across the bonding due to that ultra low resistance.


In regards to gas lines- RJ- do you personally have any experience with csst? I know that was a major game changer.


http://www.npihome.com/tag/american-gas-association/

 

[romex jockey]

In regards to gas lines- RJ- do you personally have any experience with csst? I know that was a major game changer.

No more than any garden variety spark MBrooke , these days we're told to find some part of it that's solid & bond it

...ouch!


~RJ~

 

[GoldDigger]

Yup- electronics are no different than people in a pool or hot tub. Basically the people/electronics are the high resistance and bonding is the ultra low resistance. The goal is to have most of the voltage drop across the bonding due to that ultra low resistance.
...
...

More properly, the goal is to have most of the fault current flowing through the bonding, so that the identical voltage drop across person and bonding is low enough not to cause harm to the person.

 

[mbrooke]

More properly, the goal is to have most of the fault current flowing through the bonding, so that the identical voltage drop across person and bonding is low enough not to cause harm to the person.

Oopps, voltage drop as in pulling down the voltage between two points... horrible choice of words.