Checking Earth on an Industrial Equipment

[sarky]

Right there ya go some pictures for ya.

 

[Engineer54]

Thank's Sparky,


OK so this generator is within an enclosed building along with at least one other Genny that i can see. So scrub the my first post, that was for a single pad/generator in it's own enclosure/building.

You would now need a small linked earth field of say 3 or 4 deep earth electrode/rods in a straight line or in a ''crows foot configuration'' outside the generator building. Same as before on the rod positions, (ie driven, or bore hole) just make certain that the distance between the rods is at least the same as the depth/length of the rod in the ground, maybe add a half metre to the distance for good measure. Again link them out with at least a 50mm CSA copper conductor (can be cable or copper tape)!! Also again, leave one rod/electrode accessable, as your test position, (nearest the building is best) ...ie, having removable connections.

You could also do the same for the other generator(s) Taking out a separate string of rods for that installation. Try and keep the two (or more rod fields) as distant from each other as you can, then solidly link them, possibly by a common earth bar located in the Genny building. The earth bar should be one that has a removable link(s) between the two sections of earth bar, this is for testing and fault finding exercises. You you can also use the Ufer earth of the buildings foundation re-bar, but again, linked to the earthing system/earth bar, via a removable bolted connection...

Just a thought here, ...If you have any changer-over switches (manual or automatic) from one generator to another, make sure that they are 4 Pole switches, and NOT 3 Pole switches... ie, never solidly link the neutral connections of 2 generators, or mains and generator!!

 

[sarky]

thanks for the comments, As soon as i get the megger tester will do the test on the soil at least so i can go through the learning curve, but for sure will require your assistance to figure out what i am doing and why i need to do it

Thanks again

 

[Knobhead]

HeHe they bring back memories. That looks like Goodwin and Barsby kit :teeth_smile:
The s**t looks the same.

 

[sarky]

lol its a parker blackmobile plant i think 70's and still running but going to be changed in a year or so..

 

[sarky]

right guys just did the test and using 2000 Ohms as directed in the Manual and got the Earth Resistance of 27 Ohms,
Don't know what it means method used.

Used the Existing Earth Rod in ground and the Stakes as directed and got the above result.

Thanks