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Anonymous Poster #1

Earth Pit Distance

09/04/2021 2:58 AM

Is there any minimum distance required as per any standards between underground gas lines and 3 meter pipe earth electrode?

Fault current: 25kA for 1 sec.

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#1

Re: Earth Pit Distance

09/04/2021 7:12 AM

You will find your answer here,but you must look for it.

https://inspectapedia.com/plumbing/Gas_Meter_Clearances.php

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#2

Re: Earth Pit Distance

09/04/2021 4:39 PM

Well you probably wouldn't want them touching...probably a safe distance should be tested to be sure...

https://www.coleparmer.com/tech-article/ground-testing

https://www.ecmag.com/section/codes-standards/grounding-and-bonding-gas-piping

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#3

Re: Earth Pit Distance

09/05/2021 2:23 PM

It depends on the electrical code applicable in the country of installation, which has been withheld from the forum.

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#4

Re: Earth Pit Distance

09/05/2021 6:27 PM

I'm certain such a standard exists for many locations and that there are many licensed individuals with the authority to say. This brings to my mind a few questions.

Where will this be installed?

Will our recommendation for a distance add any value to this project?

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#5

Re: Earth Pit Distance

09/15/2021 10:25 AM

The short-circuit withstand current of 25 kA/1 sec it is not referring to the electrode but to an installation. We don’t know how many electrodes are used here and the what is grounding resistance. If we take only one pipe for grounding in 100 ohm.m earth, according to BS7430 we get only 32 ohm that means we need 814 kV in order to produce 25 kA. Let’s say the soil resistivity it is only 10 ohm.m [close to a river] the resistance presented by one steel pipe of 3m and 3/4” diameter is 3.25 ohm then we need only 81 kV for 25 kA.

In my opinion I think it is about low voltage [230 V] so the maximum short-circuit current it is only about 7 kA.

In my opinion since the installation is in open air it is an unclassified zone, where it is not a hazardous location for any distance. The connection of the grounding cable with the electrode may be enclosed-for more protection never the less if it is not any switching device it is not required by NEC art.500.

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