This is my tentative plan, please let me know if I've missed anything
I've labelled the original Eskom DB as DB1 and I'm adding DB2 and DB3.
DB2 and DB3 have warning labels, Alternative supply labels and pilot lights.
I will refer to them as
(eskom) DB1
(inverter) DB2
(combiner) DB3
in this thread so you don't have to remember which is which, but on the DB's there are only labels such as DB1, DB2 and DB3.
The 2400W inverter's 2 output wires each go via a 12A fuse, to earth leakage (inverter) DB2, that feeds input B of a relay. (used when the relay coil is powered off)
The Relay is double pole, double throw 250V 10A.
A normal 16A plug brings power into (inverter) DB2, the earth is joined to the output cable's earth.
Both of the live and neutral wires from this cable each go via 12A fuses to input B of the relay.
(after the fuses) they also feed a 12v power adapter, that powers the relay's coil.
The fuses protect against hypothetical failure of the relay.
The output of the relay feeds 2 terminal-bus-bars inside (inverter) DB2, the live output bus bar feeds a 10A breaker labelled "Plugs and DB3"
A single Surfix 1.5mm live, neutral, earth (+ shielded) cable is split inside wall junction boxes, and carries the (inverter) DB2 output to wall-mounted multi-plugs and also feeds (combiner) DB3.
The multi-plugs all feature built-in always-on pilot lights and these multi-plugs will be labelled "Alternative supply"
Inside (eskom) DB1. A new breaker labelled "DB3" has been added. This breaker is fed from the earth leakage live output.
Red and black wires carrying this breaker's output, as well as the earth leakage neutral bus bar feed the changeover switch in (combiner) DB3.
(combiner) DB3 is installed next to (eskom) DB1.
On the left, (combiner) DB3 has an isolation switch for the supply from (inverter) DB2.
Next to the Isolation switch is the changeover switch, it's top input is the output from the isolation switch, it's bottom input comes from (eskom DB1)
The changeover switch output feeds a output neutral terminal-bus-bar and feeds breakers for (digital gas) Geyser and Lights, respectively.
Inside DB3 I have 3 pilot lights
1. Eskom supply
2. Alternative supply
3. Output enabled (the output of the changeover switch)
I will add some pictures.
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