I have read, with great interest, the first two responses to this question and am not in complete agreement with them. I guess that this shows that there are multiple approaches to any compliance issue and arguments can be made for any of them. With that said, I'll give my opinion on the most appropriate approach towards demonstrating compliance with the EMC Directive.
As a motor driven appliance without any digital electronics or microprocessors, EN 55014 and EN 55104 apply as a product standards. The generic EMC standards should apply only if there are no applicable product standards. EN 55022 and EN 55011 are product standards for ITE and for ISM RF equipment. Note that 55011 is for devices that generate RF intentionally, either for treatment of material or for internal use. A microwave oven is an ISM device. EN 55014/55104 are product standards for devices that contain motors and switching/regulating devices including heating functions. Although these standards both contain the phrase "household" in their titles, upon reading the scope of these standards, it is stated that they also apply to non-household (similar) devices. As to be expected for these devices that generally do not contain high frequency emissions sources, EN 55014 consists of conducted emissions tests only. Potential RF radiation from the powerline is checked via a 30-300 MHz emissions test of the powerline using a CISPR 16 absorbing clamp. Discontinuous, transient (click) emissions from motor control, or power regulation functions are evaluated to a relaxed limit based on the frequency of the transients. EN 55104 requires further classification of the equipment to determine the applicable immunity tests. A mains powered device without any oscillators or clocks operating above 15 MHz is a Category II device, which requires ESD, EFT/B, conducted RF immunity (150 kHz - 230 MHz), surge and voltage dips/interruptions testing. Test levels are approximately equivalent to the light industrial generic immunity spec., however, no radiated immunity is required. Hope this helps. Doug Frazee EMC Compliance Engineer Alliant Techsystems, Inc. Advanced Technology Applications 401 Defense Highway Annapolis, Maryland 21401 USA Tel: (410) 266-1793 FAX: (410) 266-1853 [email protected] >---------- >From: [email protected][SMTP:[email protected]] >Sent: Tuesday, August 19, 1997 5:01 PM >To: [email protected] >Subject: Which EMC Directive Standards might apply here? > >Good Day List, > >I am trying to determine what tests apply under the EMC >directive to a piece of chemistry lab equipment. The device >is a small table-top "agitator" to mix up containers of "goop". >(note my chemistry terminology is limited.) > >The device in question has a variable speed 24VDC motor >controlled by pulse width modulation. The PWM chopper >operates around 20 kHz. The device plugs into a wall >outlet (120VAC or 240VAC) There are no microprocessors, or >any digital electronics in the device. > >My experience has been in ITE testing, using the ITE emissions >standard and the Generic Immunity Standard. I expect the >Generic standards (emissions & immunity) would apply to the >"goop mixer". Does this sound correct? Does the Generic >emissions standard essentially boil down to EN 55022? > >I suspect this last question may be slightly controversial: >Assuming that EN 55022 applies, would this be a Class A or >Class B device? The device is sold only to educational / >research facilities, not the general public. > >Any opinions would be most appreciated. > >Thanks in advance, >Bob Sykes > >
