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From: James Sweet on 21 Nov 2009 15:37 > > There is no CT in residential metering, the energy meter is connected > directly. Even commercial / light industrial you do not see CTs in > the meter circuit until 600 A, and before that you are typically at > 480 V 3-phase (in the US). My uncle's house (in the US) has a 400A service with current transformers. They're not common but they do exist. IIRC 200A is the largest residential meter.
From: John Larkin on 21 Nov 2009 16:03 On Sat, 21 Nov 2009 12:37:10 -0800, James Sweet <jamesrsweet(a)gmail.com> wrote: > >> >> There is no CT in residential metering, the energy meter is connected >> directly. Even commercial / light industrial you do not see CTs in >> the meter circuit until 600 A, and before that you are typically at >> 480 V 3-phase (in the US). > > >My uncle's house (in the US) has a 400A service with current >transformers. They're not common but they do exist. IIRC 200A is the >largest residential meter. It's dangerous to make catagorical statements like "There is no CT in residential metering." It only takes one counter-case to make you wrong. John
From: Michael A. Terrell on 21 Nov 2009 18:58 John Larkin wrote: > > On Sat, 21 Nov 2009 12:37:10 -0800, James Sweet > <jamesrsweet(a)gmail.com> wrote: > > > > >> > >> There is no CT in residential metering, the energy meter is connected > >> directly. Even commercial / light industrial you do not see CTs in > >> the meter circuit until 600 A, and before that you are typically at > >> 480 V 3-phase (in the US). > > > > > >My uncle's house (in the US) has a 400A service with current > >transformers. They're not common but they do exist. IIRC 200A is the > >largest residential meter. > > It's dangerous to make catagorical statements like "There is no CT in > residential metering." It only takes one counter-case to make you > wrong. Like the claim that no US homes have three phase power that was made on this group (alt.engineering.electrical) a few years ago. -- The movie 'Deliverance' isn't a documentary!
From: John Fields on 21 Nov 2009 19:55
On Fri, 20 Nov 2009 10:43:14 -0800 (PST), Bill Sloman <bill.sloman(a)ieee.org> wrote: >On Nov 20, 1:31�pm, John Fields <jfie...(a)austininstruments.com> wrote: >> Knowing that, my take on Koltner's lighthearted comment was that he was >> referring to a single conductor, such as the ones used in high voltage >> distribution systems which are called, by the way, "power lines". > >Wrapping turns around a high voltage power line probably wouldn't be a >good idea. --- He said, with his last breath, and then quietly sank into the sea... JF |