4 Jan
2022
4 Jan
'22
6:47 p.m.
For what it's worth, the building I bought has two
services installed when
it was built in 1921 - single phase 120/240 for lighting loads, and 240V
Delta for three phase loads.
I bet you have a fun electrical system :D
It's the even more obscure corner-grounded delta
I love the reaction when a tech or plant electrician encounters corner-grounded delta for
the first time. The meter says one phase is missing, yet everything is fine! Often coming
off a backfed transformer turning 208Y into 480 delta, which also apparently blows some
minds. I did once see what happens when a new guy connects the neutral on the Y primary
side.
Thanks,
Jonathan