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Thread: 1 phase 460v cond. motor?
12-08-2012, 08:31 PM #40
The more I learn about the power reticulation system used in the States, the more it horrifies me.
We joke about using the earth wire as a neutral return path over here but nobody would actually do it.
It sounds positively 19th century...
12-09-2012, 02:41 PM #41
Earth can never be used in place of a neutral to the power transformer. Here, that neutral is a transformer secondary center tap, so that the full secondary voltage is 220v, and one end of the secondary referenced to the center tap is 120v, which is our basic residential voltage for lighting and small appliances. We send the two ends of that transformer secondary and the center tap neutral from the pole to the home. A two pole breaker provides 220v, and a single pole breaker referenced to the neutral gives 120 volts.
Does that help?
12-09-2012, 10:23 PM #42Regular Guest
- Join Date
- Feb 2011
3 phase moter will have resistance the same on all 3 legs .If not moter bad ,which i worked on a older trane which was a 208 230 volt 3 phase which hinding in the corner was a step up transfprmer 460 v 1 phase .running condenser fan '
12-09-2012, 11:09 PM #43Professional Member
- Join Date
- Jan 2008
- LEHIGH VALLEY, PA
archaic is a good word , do not see rcd, s, still see lots of fuses of all styles on main supplys , do not even see disconnects ( isolators ) next to equipment , a recent service call at a hospital to replace a thermostat on a freezer room , two seperate systems but a single stat mechanical type double throw, so to isolate requirers access to the roof 3 floors up and a key to access the roof and a ride in the elavator and a lot of walking from one end of roof to the other , and you need to turn off both sets of equipment as you dont know which is the supply to the stat , by the way in evey call i make if you want to start a manual defrost , you also need to find the condensing unit which is inevetiably on a roof 20 ft high is common , as the clock and i mean the old style paragon type is still in daily use here isalways locted at the condensing unit , they have not heard of a control panel defrost control etc and an isolator adjacent to the freezer room , , some of there stuff takes alot of getting used to , and then there are wild legs but that is a different story ,