Fred: You are correct. Its just one of the many glitches in the standard. Column one applies until the maximum is reached where ever that might be.
There is a committee draft out for comment which takes the limit above 1000 Watts for professional equipment. It also clarifies the definition of professional equipment. Dave George Unisys ---------- From: owner-emc-pstc To: emc-pstc discussion group Subject: IEC1000-3-2 List-Post: [email protected] Date: Wednesday, November 27, 1996 12:31PM Return-Path: <[email protected]> Received: from trsvr.tr.unisys.com by trpo1.tr.unisys.com id <[email protected]>; Wed, 27 Nov 96 15:12:39 EST Received: from bbmail1.unisys.com by trsvr.tr.unisys.com (8.6.12/8.6.12) id UAA19463 ; Wed, 27 Nov 1996 20:05:56 GMT Received: from ruebert.ieee.org (ruebert.ieee.org [199.172.136.3]) by bbmail1.unisys.com (8.7.3/8.6.12) with ESMTP id UAA16806; Wed, 27 Nov 1996 20:13:43 GMT Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id MAA08679 for emc-pstc-list; Wed, 27 Nov 1996 12:35:58 -0500 (EST) Message-Id: <[email protected]> List-Post: [email protected] Date: Wed, 27 Nov 1996 12:31:31 -0800 From: Fred Waechter <[email protected]> Organization: SMPS Consulting X-Mailer: Mozilla 3.0Gold (Win16; U) Mime-Version: 1.0 To: emc-pstc discussion group <[email protected]> Subject: IEC1000-3-2 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: [email protected] Precedence: bulk Reply-To: Fred Waechter <[email protected]> X-Resent-To: Multiple Recipients <[email protected]> X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to [email protected] X-Info: [Un]Subscribe requests to [email protected] X-Moderator-Address: [email protected] ---------------------------------------------------------------------------- -- I am trying to understand the IEC1000-3-2 standard. My equipment is classified as Class D. Table 3 - Limits for Class D Equipment, has two columns for the limits, one is maximum harmonic current per watt and the other is maximum permissible harmonic current. The two columns don't appear to agree. Since the maximum input power for Class D equipment is 600W, should the maximum permissible harmonic current for the third harmonic not be 600x.0034 or 2.04A? The table gives a maximum limit of 2.30A. The only harmonic that agrees with my interpretation is the fifth. All the rest are higher than when doing the calculation. Am I missing something? I do not have a copy of EN61000-3-2, what is the difference between the two standards? Thanks for you help. Fred Waechter SMPS Consulting [email protected]
