None of those situations would require 3 phases..so for info, incase you ever go back into the business
houses with...........
a pool
or
horse stables
or
old farmhouses
or
new build 10 bedders
or
houses with hot hubs
or
houses with cat 5 and IT suites
or
most brown stones in london ( circa 1800s )
or
most new build houses with more than 12 beds or ones that have an electric car point or large out houses ( barns / stables etc )
or
most new builds that are in a range of 3 miles from a wind farm or solar harvest ( typically farm houses but some estates are now falling into this category )
or
a million other reasons............................................
do i need to continue, or in your entire career did you never do any electric work apart from changing a plug ???
please forgive my harsh reply, its the language i use with rude and " i know it all " people who typically hang around the internet professing they are experts on all aspects of life but are rarely an expert in anything other than their own imagination
wow