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  • JoshB260 commented on kwinana's instructable 6.3 KiloWatt Ground Mount Home Solar Array2 months ago
    6.3 KiloWatt Ground Mount Home Solar Array

    What you have is simply an AHJ who doesn't really fully understand the meaning of the code requirement. He is simply covering his rear end. This is common, because most AHJ's are just former electricians. They know how to be an electrician and wire a house or a motor, but they don't know the basics of how electricity really works, and so are unwilling to allow anything outside of code even when the code is irrelevant. Frankly, the grounding requirement was probably inserted into the code by a company representative working for a company that provides racking as a way to ensure people had to buy their racking to meet code rather than just cobble together their own rack however they saw fit. About 3/4 (and this is probably low) of the people who get together to write the code are eit...see more »What you have is simply an AHJ who doesn't really fully understand the meaning of the code requirement. He is simply covering his rear end. This is common, because most AHJ's are just former electricians. They know how to be an electrician and wire a house or a motor, but they don't know the basics of how electricity really works, and so are unwilling to allow anything outside of code even when the code is irrelevant. Frankly, the grounding requirement was probably inserted into the code by a company representative working for a company that provides racking as a way to ensure people had to buy their racking to meet code rather than just cobble together their own rack however they saw fit. About 3/4 (and this is probably low) of the people who get together to write the code are either academics who have never wired anything, or special interests of some sort with something to sell. This is why we have the arc fault requirement on new wiring, even though if it is really useful anywhere it is on really old wiring where the insulation is degrading over time, and a ground is not even present as a safety measure. At any rate, it is best to never argue with the AHJ, just nod politely and say "yes sir" and do what he wants. I've been told by more than one contractor to do something bone headed to get it past the inspector, and the "go back and make it right later".

    You are not wrong. Currently those big fossil plants have a ton of what is called "spinning reserve" which can resist frequency fluctuations. Without significant storage penetration the practical limit of solar that can be absorbed is maybe 20-25% before thing start to go haywire really quickly.

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