A very nice example of another use of the 120/240V nameplate marking _______________________________________________________________________________
Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: Don Gies <don.g...@alcatel-lucent.com> To: EMC-PSTC@LISTSERV.IEEE.ORG Date: 01/27/2012 09:24 AM Subject: Re: [PSES] Is this common knowledge - Electrical Ratings Kevin, Note also that here in the US, in Canada, and other countries with power systems similar to that of the United States, nominally 120 V to ground, 60 Hz, residential single phase, 3-wire power is identified as a "120/240 V ac, single phase, 3-wire" system. This consists of the two live ungrounded conductors located at the ends of the service transformer secondary (i.e., L1 and L2), and the grounded neutral (N), which is the center-tap of the transformer. This does not mean that you necessarily use either 120 V or 240 V, but often use both in the same appliance. Examples include electric clothes dryers that use 240 V for the heating element and 120 V to spin the barrel, and industrial service equipment such as telephone wireless base stations that may use 240 V for the main electrical loading, but have a 120 V convenience receptacle for powering service personnel's tools. Appliances that simultaneously utilize both 240 V ac single-phase loads and 120 V ac loads have electrical ratings like "120/240V ac, 3 wire, XX A, 60Hz." For these types of products, it is important to use "3 wire" in the electrical rating to distinguish it from a product that uses either 120 V or 240 V at the same input terminal. Best regards, DON GIES, NCE ALCATEL-LUCENT SENIOR PRODUCT COMPLIANCE ENGINEER BELL LABS - GLOBAL PRODUCT COMPLIANCE LABORATORY Murray Hill, NJ 07974-0636 USA don.g...@alcatel-lucent.com MEMBER, ALCATEL-LUCENT TECHNICAL ACADEMY -----Original Message----- From: Kevin Robinson [mailto:kevinrobinso...@gmail.com] Sent: Friday, January 27, 2012 11:57 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Is this common knowledge - Electrical Ratings Thanks everyone for your response. Everyone who responded to me on the forum and privately was correct that 120-240V indicates a range, and the product can operate at any voltage over that range. 120/240V indicates that the product can only operate at those specific voltages (plus tolerances). As for the "general public", I was actually quite surprised. I asked several people that I know, many of whom freely admit they "don't know how electricity works". Every person I asked knew that 120-240 was different from 120/240 and they were able to guess a range vs either/or. The "general public" was pretty clear on 120-240V saying they would just plug it in and it would work, however they were confused when faced with 120/240, some said they should look for a voltage selector switch, others indicated they would need some sort of adapter, and a few people said just plug it in and it will work. Thanks again for your responses, Kevin - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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