Mona, you should try FCC Part 15, under the definition of the applicability of the Classes A and B. In the FCC regulations, it is simply stated that it can be assumed that and FCC Class A compliant component when placed into a Class B product or system, will derate the whole system to Class A. (Sorry but I can't quote chapter and verse.)
Likewise, Class A + Class A = Class A, and Class B + Class B = Class B. I think we all know this is not necessarily the case in the real world, but FCC has to let it go!!!! For the CE Mark, these leaps of faith are verboten!! In other words, YOU are self declaring your product's compliance to Class A or B, and therefore you better back it up by testing it as a complete system. Even the EMC Directive guidelines, which specify some examples of the few instances where the 'FCC assumption' would aptly apply (which BTW are pretty lame examples), are over-ridden by the Directive itself. This again, puts the responsibility on the Manufacturer or the Importer to get it right. I hope this helps!! Regards, Rob Stirling, P.Eng. Protocol ________________________________________________ For COMPLETE safety, EMC, and regulatory Compliance Engineering solutions call Protocol!! ph 604 218 1762 fax 604 572 9408 Vancouver B.C. ________________________________________________ Mona Akerblom wrote: > > Hi there EMC/PSTC folk: > > There's been a number of discussions here about the validity of "Class > X + Class X = Class X" in the various FCC and CISPR EMC requirements. > > Bypassing the whole "is it appropriate" question, where exactly is it > written that this is acceptable? Is it written in the standards > themselves? > > I'm mostly involved in working with our system HW design to make sure it > passes, and haven't gotten much involved at all in the reading and > interpretation of the actual standards, or interfacing with the > agencies, i leave that to our Regulatory Affairs group. As such, I > haven't personally read the standards myself (yet!), so pardon the > basic-ness of my question ;-). Unfortunately, I'm starting to need to > know this sort of thing, and need to start arming myself with standards > and supporting documents. > > if someone could point me to the appropriate document (if not written in > the actual standard), or section of the standards so i can look this up, > i'd be greatly appreciative. I'm mostly only interested in CISPR 11A > (EN5011A), but wouldn't mind pointers for FCC Class A as well. > > Thanks so much in advance, > Mona Akerblom > Acuson Corp. > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
