3 phase domestic

Nothing!

Don't be frightened by the 400 V phase-phase potential. Yes, the equipment is a bit different. Yes, safe isolation and IR testing require 10 tests rather than 3, but the principles are all the same.

The fuseboard thing is interesting. As things stand, TPN boards are bulkier and more expensive than SPN ones. As Zoomup suggests, you could have 3 SPN boards, but IMHO that is silly.

If a property has a TPN supply, will it use them? Range cookers can, EVCPs can. Lightbulbs cannot.

Many years ago when NSH were being promoted or where gas was not available 3 phase was often installed. Where I currently live there is a 3 phase 100A supply due to no gas being available in 1969 when it was built. The builder installed oil boiler so it's never been used. When we move here in 2016 I did consider electric heating instead of the oil but as gas came to the village in the 1980s but the previous owner was to mean to share the cost with next door to have a gas supply installed in one trench for the two properties. I bit the bullet, had gas and new central heating installed.

So we continued to use the blue phase but did replace the old MEM 6w metal single phase board for a standard 12Way with MCBs and RCD. The OP did not mention any 3 phase requirements so as Chris says just a bog standard domestic system is seguired and the DNO will use just one phase.

Many years ago when NSH were being promoted or where gas was not available 3 phase was often installed. Where I currently live there is a 3 phase 100A supply due to no gas being available in 1969 when it was built. The builder installed oil boiler so it's never been used. When we move here in 2016 I did consider electric heating instead of the oil but as gas came to the village in the 1980s but the previous owner was to mean to share the cost with next door to have a gas supply installed in one trench for the two properties. I bit the bullet, had gas and new central heating installed.

So we continued to use the blue phase but did replace the old MEM 6w metal single phase board for a standard 12Way with MCBs and RCD. The OP did not mention any 3 phase requirements so as Chris says just a bog standard domestic system is seguired and the DNO will use just one phase.