Article View: sci.electronics
Article #20027Re: Polarized Plugs for 120 VAC
From: Edward M. Embick
Date: Tue, 15 Nov 1988 18:16
Date: Tue, 15 Nov 1988 18:16
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1776 bytes
In article <4759@bsu-cs.UUCP> dhesi@bsu-cs.UUCP (Rahul Dhesi) writes: >It seems to me that it would be far safer to have each of the two hot >wires be at +/- 55 volts relative to ground. A grounded center-tapped >secondary would do it. > Rahul, This is the way the 240 VAC is set up. Each hot wire is 120 VAC relative to ground. The 120 VAC in you house is usually the neutral and one of the two phases from a 240 VAC feed from the utility to your main power panel. The 240 VAC then is used for electric range, dryer, hot water heater, or other appliances without having to get additional service from the utility. Your 120 VAC recepticles are usually divided between the two phases to balance the loading on the 240 VAC source. ------------------------------------------------------------------------------ Ed Embick (If God wanted me to write legibly, He wouldn't have invented email) Computer Sciences Corporation ____ ____ ____ 4045 Hancock St. MILNET: embick@tetra.nosc.mil // // // San Diego, CA 92110 \\___ ___// \\___ (619) 225-8401 x287
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bloom-beacon!bu-cs!purdue!decwrl!labrea!agate!helios.ee.lbl.gov!nosc!tetra!embickReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bloom-beacon!bu-cs!purdue!decwrl!labrea!agate!helios.ee.lbl.gov!nosc!tetra!embick From: embick@tetra.NOSC.MIL (Edward M. Embick) Newsgroups: sci.electronics Subject: Re: Polarized Plugs for 120 VAC Summary: 240 VAC is 120 VAC 180 degrees out of phase Keywords: house, wiring, safety, single phase, USA Message-ID: <712@tetra.NOSC.MIL> Date: 15 Nov 88 18:16:37 GMT References: <686@bnlux0.bnl.gov> <4759@bsu-cs.UUCP> Reply-To: embick@tetra.nosc.mil.UUCP (Edward M. Embick) Followup-To: sci.electronics Organization: Naval Ocean Systems Center, San Diego Lines: 19