That is my take on it, why impose a capacitance limit at all if you already limit the current. But I think perhaps I'm missing the intent of the capacitance limit. In my wishes, and I do mean wishes, I could fail the 7uA limit, and meet the capacitance and thus be a limited current circuit.
________________________________ From: [email protected] on behalf of Ralph McDiarmid Sent: Thu 11/2/2006 12:44 PM To: [email protected] Subject: RE: 60950 question If you meet the peak current limit, wouldn't you also meet the capacitance limit by necessity? Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc. From: [email protected] [mailto:[email protected]] On Behalf Of Kim Boll Jensen Sent: Thursday, November 02, 2006 2:21 AM To: Clif Brick; [email protected] Subject: SV: RE: 60950 question Hi First part of 2.4.2 talks about frequency (over OR under 1 kHz) next part talks about voltage (over OR under 450 Vac) so it must be an AND between those two requirements (current limit AND Capacitance). This is how CSA told me about the requirements 8 yeasr ago. Best regards, Kim Boll Jensen Bolls Radgivning Ved Gadekaret 11F DK-3660 Stenlose Tlf.: 48 18 35 66 Fax: 48 18 35 30 Mobil: 22 99 69 91 E-mail: [email protected] web: www.bolls.dk Fra: [email protected] [mailto:[email protected]]Pa vegne af Clif Brick Sendt: 1. november 2006 17:41 Til: [email protected] Emne: [Norton AntiSpam] RE: 60950 question John, In this case, I'm not sure that 'and' makes sense. If it were 'and', then one would need to be certain, in spite of having a result lower than .7mA, that the circuit capacitance met the additional requirements. That isn't standard practice as far as I'm aware. There is a great difference between a sinusoidal, continuous current that exceeds let go and a current that MUST end due to lack of capacity or stored energy. In the sense of IEC 479-2, I think it's pretty clear that OR would make sense here, as there wouldn't be enough energy to cause burns, not a long enough current to exceed let go, and not a waveform likely to cause fibrillation. I don't know, I'm just trying to learn. Thanks, Clif From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Wednesday, November 01, 2006 10:43 AM To: [email protected] Subject: Re: 60950 question In message <4be0b2b96f73e3448c6f86309fc15ca605ac5...@iticpm01.innotek-inc.com>, dated Wed, 1 Nov 2006, Clif Brick <[email protected]> writes >My question is one of understanding whether or not I must AND or OR the >seperate clauses in 2.4.2. This is a problem that keeps coming up in many standards. Editing committees should take careful note of it. It is worse with bulleted lists, which can be totally ambiguous with respect to 'AND' or 'OR'. But in the plain text of 2.4.2, one has to assume that the requirements are 'AND'. What does the Annex D measurement give as a result? If you don't have the instrument, you can do a SPICE simulation. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Swine wave - a waveform whose spectrum is exceptionally difficult to calculate. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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