I disagree with your comments in regards to DC mains conducted emissions for EN55022:1998 or CISPR 22 and believe that the DC mains input is required to be tested. Section 5 of EN55022 calls out limits for conducted emissions on the mains input terminals. The standard does not specify AC or DC, voltage levels or even a frequency 50/60/400Hz. As such, DC mains input products are not excluded from testing. One of the older versions of CISPR 22 had a statement about only testing mains input terminals that connect to a public low voltage network (which you could infer is the power grid), but that statement has been removed from the current version. Regards, Doug Parker, NCE Senior Compliance Engineer
-----Original Message----- From: [email protected] mailto:[email protected]]On Behalf Of Howard Ji (howardji) Sent: Tuesday, May 25, 2004 12:16 PM To: [email protected] Cc: [email protected] Subject: Re: Conducted Emissions on DC Req? EN300386 requires conducted emission on dc power ports. EN55022 doesn't require dc conducted emission on dc power ports. Both standards are usual standards in my industry. At 11:43 AM 5/25/2004 -0400, [email protected] wrote: Is there an exemption from testing Conducted Emissions on DC Power ports? If so can anyone point me to where the exemption is documented? My particular case is with Industrial Control equipment for use in fixed and mobil (shipboard) applications. Thanks in advance. John Merrill Product Safety Engineer Schneider Automation
