From: noone@nospam.com   
      
   Στις 19/3/2022 6:34 μ.μ., ο/η gfretwell@aol.com έγραψε:   
   > On Sat, 19 Mar 2022 16:18:39 +0000, LON484   
   > <0f8503901d844703eea1acecb7a4938a_2858@example.com> wrote:   
   >   
   >> I just had a new circuit installed for a dryer. I was told it was 240 volt   
   but   
   >> I'm having doubts. Would I be able to tell from the panel? The following is   
   an   
   >> excerpt from my building's electrical specifications. The building has 10-20   
   >> apartments:   
   >>   
   >> "From a service end box, electrical feeders connect to a service switch   
   which   
   >> provides power to the building’s residential systems. The   
   service switch   
   >> is a three-phase, four-wire 208/120 volt switch rated for 600 amperes. The   
   >> service switch conducts power to the residential electrical meter bank. Each   
   >> residential unit is provided with a dedicated feeder Each dedicated feeder   
   >> then conducts power at one-phase, three-wire 208/120 volt to local   
   >> distribution panelboards located in each residential unit."   
   >>   
   >> Sounds to me like I can only get 208 volts, but if power to my unit is only   
   >> provided at one phase, I'm confused as to why it would be 208 volts, which I   
   >> thought was a voltage between phases.   
   >>   
   >> Is it even possible for me to have a 240-volt circuit in my unit based on   
   the   
   >> above description?   
   >   
   > It sounds like you have single phase 120/208 derived from 3 phase wye.   
   > It is not uncommon in multifamily.  The only way you would get 240 is   
   > if the building was wired 3p center grounded delta and that would be   
   > rare in your situation.  Your dryer should work, that answer is in the   
   > electrical requirements in the installation manual but it will dry   
   > slower.   
   So in the US sometimes you have low voltage wired in wye and sometimes   
   in delta? because here it's always wired in wye with center grounded,   
   230/400 volt. Usual service is 35 A, 230 Volt. Sometimes bigger houses   
   are 3 phase 400 volt but usually have no 3 phase load, just 1 phase   
   loads distributed across 3 phases. Usually 3X 35 A, 400 Volts. Usual 3   
   phase loads in industry are of course induction motors and heating   
   elements etc. but it's still 400 Volts (not 660 it's very unusual).   
      
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