Neutral/earth bridging method.

[Isetech]

This is the reason both a relay and permanent bond are not the correct way to do it.

They are both just as dangerous and why, not having SABS approval in place prior to dumping these products in SA.

These units are not designed for the SA market and wouldnt have reached the SA shelves if there was still SABS approval required. I am surprised nobody has challenged the sale of these products.

To make matters even worse, the manufacturer just tells everyone they should do it as per the countries regulations.

So right now, anything goes and that is why people dont really care much for SANS regs.

If you decide to go with the relay and it fails, you are creating an even more dangerous environment for the user.

If this ever went to court, it would make for a really interesting court case, who would be responsible if someone was killed?

The manufacturer for dumping what some would be regarded as a dangerous product, I doubt them telling you on a youtube video to connect as per your countries regulations would cut it.

The supplier for selling this product without a a detailed document highlighting the dangers of these products?

The DOL for not taking steps to investigate these products and creating regulations to ensure the product is safe to install.

The installer who is not provided with a legal approved document clearly stating the dangers of this product and a detailed approved method to make it safe?

The fact that this subject is even being discussed on social media is a clear indication that there is a problem, so honestly If I were you I wouldnt worry to much about the a NO or NC relay, either way it is not safe until the inverters are designed and approved for sale in SA, with the required modifications to make them safe.

When bridging the neutral and earth on the inverter output during islanding mode, there are basically 2 ways of doing it and achieving the same result.

Which is the correct way and why ?

A. Use a normally open contact on the relay and energise the relay coil from the inverter output. Or.

B. Use a normally closed contact on the relay and energise the relay coil from the inverter input.


Edited 08.06am.

Ok, stupid question. Must be B. Inverter output is always there, whether in islanding mode or not so the relay will remain energised permanently.