Well, being an old diesel mechanic, I have a better solution to all this frequency / voltage stuff...
Matthew J. Willis, CET Automatic Fire Sprinklers Norred Fire Systems L.L.C. 318-387-1134 Voice 318-387-1163 Facsimile [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Stewart Kidd Sent: Thursday, August 27, 2009 10:45 AM To: [email protected] Subject: Re: 3 from 1 You'd be welcome ! Stewart PS Bring your voltage and frequency converters - our extra strength 240v 50 hz AC munches wimpy US 110v 60 Hz appliances ! On 27 Aug 2009, at 16:42, George Church wrote: > EFSN conference? > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Matthew J. > Willis > Sent: Thursday, August 27, 2009 10:54 AM > To: [email protected] > Subject: RE: 3 from 1 > > Good stuff. Thanks John and all. > > I think I need a trip to Europe now... > > > Matthew J. Willis, CET > Automatic Fire Sprinklers > Norred Fire Systems L.L.C. > 318-387-1134 Voice > 318-387-1163 Facsimile > [email protected] > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of John > Drucker > Sent: Wednesday, August 26, 2009 11:21 PM > To: [email protected] > Subject: RE: 3 from 1 > > Matt, > > Everything you want to know; http://www.convertaphase.com/index.html > > > PS, > > While we're on three phase, The "middle leg" is also called the red > leg, > wild leg or high leg. It's usually the B phase in a Three Phase > Delta where > a phase has been center tapped and grounded. This creates a neutral. > That's > helpful because if you need 120 V single phase for something that's > how you > get it. The voltage between Phase A and the neutral will be 120 (208 / > 1.732) and Phase C to the neutral 120 V. > > However if you measure the B phase to the neutral you will find appx > 180 > volts on 208 Delta, the wild or high leg ! The high leg, will be > marked in > red or orange. To figure the high leg voltage out take the nominal > phase to > phase voltage, divide by two and multiply by 1.732. (208 / 2 = 104 X > 1.732 = > 180 V on the high leg). Thus the high leg is unusable for single > phase power > yet unsuspecting persons connect 120 V single phase loads from Phase > B to > neutral and soon after smell smoke. > > > Hope that helps > > John Drucker, CET > Fire Protection Subcode Official > Fire/Building/Electrical Inspector > Borough of Red Bank, NJ > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Matthew J. > Willis > Sent: Wednesday, August 26, 2009 11:59 AM > To: [email protected] > Subject: 3 from 1 > > I need some education of Phase Converters. > > > > A 300 gpm Fire Pump (Tank fed), is supplied by one of these things. > Single > phase only is available, so one of these has been installed to make > it work. > Installed in '06-07ish, just replaced main board in controller. I > was there > to do test following part replace. 240vac, dropped to 106-108 across > the 3 > as indicated on panel. Middle leg showed 422vac in event log, as > high peak. > When started, pump shaft (vertical) jumped up and down repeatedly. > We red > tagged it and are waiting on word from electricians. Pump Motor > checked out > fine. I know they are not allowed, but it was approved, so., I just > test it. > > > > R/ > > Matt > > > > Matthew J. Willis, CET > > Automatic Fire Sprinklers > > Norred Fire Systems L.L.C. > > 318-387-1134 Voice > > 318-387-1163 Facsimile > > [email protected] > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
