The FCC also exempts a digital device utilized exclusively in an appliance, e.g., microwave oven, dishwasher, clothes dryer, air conditioner (central or window), from the its Part 15 technical requirements, so being rational doesn't always make sense.
Jim Hulbert -----Original Message----- From: Carl Newton [mailto:[email protected]] Sent: Friday, January 29, 2016 2:04 PM To: [email protected] Subject: Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation Gary, With regard to auto EMC compliance, that is taken care of already. This hardware is being subjected to AU/NZS CISPR 22 simply to satisfy AU ACMA requirements. I appreciate your comments concerning the residential zone, but I don't agree that simply because a vehicle may travel within that zone that Class B is warranted. I would still expect the vehicle to be no closer to homes than 10m in typical scenarios. From a pure EMC rationale point of view, consider that in the USA the FCC exempts auto hardware from Part 15 rules. Thanks, Carl On Fri, 29 Jan 2016 13:02:33 -0500, Gary McInturff <[email protected]> wrote: > These vehicles travel between residential and commercial zones on a > regular basis, so on that alone I would agree with the class B > assessment, but I'm wondering if you don't have lots of other EMC > issues to deal with - automotive immunity etc. > > The only time I've personally seen an exemption for Class A in a > residential zone was for telecommunications equipment installed into a > room or facility owned by a telecom company. Doesn't mean there aren't > other exemptions it just means I am unaware of them. So I think you > stuck with Class B IMHO > > -----Original Message----- > From: Carl Newton [mailto:[email protected]] > Sent: Friday, January 29, 2016 9:10 AM > To: [email protected] > Subject: [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation > > Group, > > My customer builds vehicular laptop and tablet docking stations > intended for hard mounted use within emergency vehicles such as police > and ambulance, as well as work trucks and forklifts. The vehicular > power supply narrowly missed CISPR 22 radiated Class B limits. Then > their AU Responsible Party told us they called the ACMA and they > "insisted" this is a Class B device. I then sent my own request to > ACMA and received the reply below. > > In my opinion the ACMA individual is clearly biased toward the Class B > rating, but the fact that he leaves the door open to the Class A rating > is enough proof for me that he agrees that it is a Class A device. > However, my customer is looking for safety in numbers. The author > raises a valid note of caution concerning receivers within vehicles, > but these systems are already compliant with CISPR 25 and are widely > used within North America and Europe with no interference problems so > we're not concerned with that warning. > > I would appreciate it if some of you would review this information and > provide your professional opinion as to whether vehicle mounted ITE > qualifies as Class A or Class B: > > +++++++++++++++ > > Dear Mr Newton > > Clause 4.1 of AS/NZS CISPR 22 (which is identical to CISPR 22, Ed. 6.0 > (2008)) includes the following; > > Class B ITE is intended primarily for use in the domestic environment > and may include: > > - Personal computers and auxiliary equipment. > > Note: The domestic environment is an environment where the use of > broadcast and television receivers may be expected within distances of > 10 m of the apparatus concerned. > > Given that the class B limits apply to “personal computers” (which > would also include “tablets”) it would seem logical that your mounting > stations “for computers and tablets” (which I would think fall within > the definition of “auxiliary equipment”) should comply with the same > limits as the devices they are intended to hold. > > I would also think that, because police and ambulance vehicles will > probably have a broadcast (AM/FM) receiver installed in them this > would probably constitute a “domestic environment”. I would also > question whether it would be prudent to have a device meeting the > class A limits installed in a vehicle that relies heavily on two-way > radiocommunications equipment where said device may interfere with the > operation of this on-board radiocommunications equipment. > > Having said that, clause 4.2 of AS/NZS CISPR 22 includes the > following; > > Class A ITE is a category of all other ITE which satisfies the class A > ITE limits but not the class B ITE limits. Such equipment should not > be restricted in its sale but the following warning shall be included > in the instructions for use: > > Warning > > This is a class A product. In a domestic environment this product may > cause radio interference in which case the user may be required to > take adequate measures. > > It is up to you whether you wish to comply with the class A or the > class B limits however, I would personally err on the side of caution > – if an ambulance or a police car were unable use its > radiocommunications equipment and it turned out it was due to > interference from your device the legal ramifications could be costly. > > Regards > > XXXXXXXXXX XXXXXXXXX > Technical Regulation Development Section Australian Communications & > Media Authority > > ++++++++++++++++++++++ > > Thanks group, > > Carl > > > -- Using Opera's mail client: http://www.opera.com/mail/ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> ________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
