Domestic Installer - a scheme that covers general electrical installation work in UK domestic properties only

 I see nothing especially magical about 3 phase - in much of the world domestic incomers are 3 phases by default (Southern Germany for example ). In such places, immersion heaters and cookers are commonly fed with more than 1 phase. 
I'd like to thing any domestic installer capable of say a UK CU change, ought to be able to handle the modest complication of a couple of extra live wires, at least as well as they handle things like TT supplies, rare in larger towns, or sub-mains to sheds and garages, like all things, if they don't do it that often, a quick flick though the book ought to refresh. Most domestic loads and final circuits will remain single phase.

Mike. 

 I see nothing especially magical about 3 phase - in much of the world domestic incomers are 3 phases by default (Southern Germany for example ). In such places, immersion heaters and cookers are commonly fed with more than 1 phase. 
I'd like to thing any domestic installer capable of say a UK CU change, ought to be able to handle the modest complication of a couple of extra live wires, at least as well as they handle things like TT supplies, rare in larger towns, or sub-mains to sheds and garages, like all things, if they don't do it that often, a quick flick though the book ought to refresh. Most domestic loads and final circuits will remain single phase.

Mike.