Grounding Electrodes and 25 ohms resistance

[Electron_Sam78]

I think your instructor is a little confused.

IEEE Std 142 requires large commercial installations to be <5 Ohms and Generating or transmission stations to be <1 Ohm, it is common for the owner to require a lower spec knowing that the values may increase over time, specifically if chemical treatments are used, so 0.5 Ohms is not that odd for certian installations.

I don't see the conflict, it just looks like different situations

 

[zog]

I don't see the conflict, it just looks like different situations

I am saying your instructor is talking out his butt.