It seems there little confusion amongst electricians with regards to when you should do neutral earth bonding and when you shouldn't, types of earthing systems and which are used and when.
Some say you have to permanently bond an inverter and others believe a relay must be used to prevent circulating currents and other.
Some cant tell the difference between a generator and a UPS and wiring configuration required for each.
A generator doesn't have an internal changeover switch so an external changeover over switch is required. It all by law doesn't require islanding mode, but does require mechanical isolation to prevent both supplies running together.
An inverter/UPS on the other hand is different beast, with all sorts of complex electronics, bi-directional flow on the input, a built in changeover switch and required by law to go into islanding mode when the grid power switches off.
What are your thought on earth neutral bonding for a generator and a UPS, is it the same thing?
Do you feel a relay should be used to bond the neutral/earth or permanently bonded on the output of the inverter.
Do you feel the SANS regs adequately cover this topic.
But most important do you understand the different earthing systems feeding the property and why you actually require a neutral/earth.
When a neutral/earth bond is dangerous.
What are the implications of neutral earth bonding on the property if the earthing system a TN-S
Can you go from a TN-C to a TN-C-S to a TN-S all in one elctrical installation.
Who thought this could become so complicated, add a bidirectional hybrid inverter with a generator and a few solar panels and boy do we have a mix.
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