A friend of mine lives on a rural property with two separate domestic dwellings (his own family and his parents). He's looking at the feasibility of sharing power from his parents place. His Dad built a 3 phase star alternator from farm machinery and generates 'some' of his own power (approx 12-15kw). The alternator power generated is used mainly for a dam pump, pool pump and old power hungry RAC's, welder, band-saws, tennis court lights and 2 domestic power ccts etc. I understand he applies a simple rule and only uses a maximum of two devices (1 cct being a device) at any one time. All devices are manually switched (unplugged and replugged) between alternator and Council supplies.
So for my friend to tap into this little setup somewhat more conveniently there are a couple of caveats, not all loads (or ccts) are to be switched across simultaneously, only those loads which my friend intends using at the time shall be switched.
I couldn't figure out how to directly post a pic here !! so I've attached a PDF -sorry
A few points to note on the diagram:
1. The B Supply represents the alternative supply from the parents place.
2. Earths and Neutrals are common.
3. During change-over the user must switch both Supplies OFF prior to switching a given Supply ON (will be clearly marked).
4. B Supply cable size is 6mm
5. We investigated using a DPDT change-over switch for each CCT however this is a extremely expensive option so we went for commonly used SPST ( ie main switches and CB's) except for the power where 3 RCBO's are utilized
6. Act. Link X means the phase is yet TBD - it can be either be assigned L1, L2 or L3
Any comments or ideas would be most welcome.