Good day

I can't find anything in my SANS book.

I want want to feed my inverter's grid power from the garage Sub DB. It is a big 54 Way DB.

Am I allowed to feed the inverter from there, and then bring it back into the same physical DB? I.e. partition the DB.
Then run the inverter's feed back to my main DB where it will connect up with a 50A MCB, before going into a 63A Contactor (NO/NC)

4 hours ago, jeeva said:

Good day

I can't find anything in my SANS book.

I want want to feed my inverter's grid power from the garage Sub DB. It is a big 54 Way DB.

Am I allowed to feed the inverter from there, and then bring it back into the same physical DB? I.e. partition the DB.
Then run the inverter's feed back to my main DB where it will connect up with a 50A MCB, before going into a 63A Contactor (NO/NC)

Not as per SANS but gut tells me as long as the inverter parti on in the main DB is properly marked as such. This partition is just a 2nd point of supply from the main CoCT grid supply. Not sure what spec contactor you will be using wrt contacts welding. 

Hi Jeeva & Scorp007
* PS: This can be used for other municipalities, but at own risk and research
The doc above is not clear enough. I understand that your MCB is 63A, but the rest of the diagram is not clear from an electrical standpoint. Understand that I am coming from this advise as if you do not have a complete CoC for your system. Ignore if you have a complete CoC for your system that Cape Town municipal has accepted.
From the little I am following from your diagram and description is:
* The first thing I have to say from a CoC & general standpoint is that you either need to keep your Cape Town power, far separate from any other power source (they are very strict, so don't push them), or get a signoff (tricky/time consuming) to use in single distribution. Try avoid taking anything pushed back to the first distribution point from their mains (not illegal, but avoid the stress).
* As above, set up a Cape Town input power in a completely separate MCB, and any solar/other/backup/generator/etc in a separate MCB
* Dont make "jippo" wiring, it will make your life harder later. Make sure all your wiring is up to specification (don't use 1mm connections for a 10A draw without a CB in place). Even if you can't get an expensive electrician in, make sure you are still doing things as close to legit as possible until a later CoC.
* Definately have a Switch over switch as close as possible to your Municipal input... Be able to isolate and switch over to municipal power without you backup using a change over. This will also help you isolate your solar system for checking of various faults/issues without killing your home of power.
* If you want to do things 100%, the SANS10142 & SANS10142A are available online with a search, if you follow those you should have no problem getting a CoC from a qualified electrician later.
* DONT feed back into the grid unless you have done the relevant paperwork with your municipality. It is such an easy cheat with the old meters, but if you get caught there are HUGE fines involved. Make sure you can prove that you either have the documents, or that your Invertor is set not to do that.
* Even though it might mean multiple MCB's, make sure you distribute your backup/solar power to the relevant essentials. You can power everything in the home, but some stuff should be left out (anything with an element is usually first, no geyser/kettle/oven)

This is about all I can come up with at the moment. Good Luck and the expense in doing the electrical right is worth it in the long run. If you can offer power back to Municipality, then examine the costs/reward first as it might not be worth it... I have preferred buying more batteries for storage rather than accepting their pricing, but that is a cost call you have to decide on.