The FCC IS involved in a lot more than licensing broadcast facilities and protecting the radio spectrum. It's composed of 6 bureaus and a dozen offices, all quite large. See https://www.fcc.gov/offices-bureaus for summary of what each branch does. They have been doing all those things listed for quite a long time. They do have some "Marketing" roles within the Office of Media Relations. https://www.fcc.gov/media-relations
I've had the opportunity to visit "Uncle Charlie's house" aka "The Portals" in Washington for some presentations by the Office of Engineering and Technology (OET). It's an impressive place. Whenever Congress enacts a law affecting telecommunications, the FCC starts a proceeding to create the rules and policies required by the new law. The commission also may start a proceeding when an outside party files a petition seeking a new law or change in existing rules. The FCC Rules (like Part 15) are ultimately codified in the CFRs. New Rules and Modifications to existing Rules typically originate in the form of a Notice of Proposed Rulemaking (NPRM) published by the FCC. Parties that interested/affected by the NPRM are invited to comment and after a second "reply comment" period, the NPRM is (usually) adopted. Once that's published in the Federal Register it becomes law. The U.S. Gov't Executive branch oversees the FCC via Presidential appointment of the Chairman/Chairwoman. Bob Sykes (old enough to remember when FCC started regulating digital devices via docket 20780) From: Ralph McDiarmid <rmm.priv...@gmail.com> Sent: Sunday, November 10, 2024 1:30 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B As a sidebar to this discussion thread, the FCC thinks they involved in a lot more than licencing broadcast facilities and protecting the radio spectrum within the USA. That federal agency now claims that they are: Promoting competition, innovation As a sidebar to this discussion thread, the FCC thinks they involved in a lot more than licencing broadcast facilities and protecting the radio spectrum within the USA. That federal agency now claims that they are: * Promoting competition, innovation and investment in broadband services and facilities * Supporting the nation's economy by ensuring an appropriate competitive framework for the unfolding of the communications revolution * Encouraging the highest and best use of spectrum domestically and internationally * Revising media regulations so that new technologies flourish alongside diversity and localism * Providing leadership in strengthening the defense of the nation's communications infrastructure It reads like it was written by someone with a degree in Marketing. The Code of Federal Regulations in the United States (the CFR) is published in the Federal Register as part of the National Archives. I assume the legislative branch approves its content by vote in Congress and delegates its maintenance to various federal agencies and executive departments, like the FCC, the FAA, the US Dept of Labor, etc. The Executive branch may be involved to oversee that collection of administrative laws. Maybe someone on this forum can clarify. Ralph From: Brent DeWitt <bdew...@ix.netcom.com<mailto:bdew...@ix.netcom.com>> Sent: November 9, 2024 8:07 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Emissions Class A vs Class B This is probably a bit of urban legend, but back in the 1970s, the first exposure I got to commercial EMC was with respect to VDE-0871 for Hewlett Packard products we were exporting to Germany. In 1979, the FCC had collected a number of TV (rabbit ear antennas) interference from the Apple 2 PCs. That led to the creation of Part 15, CFR47 and they borrowed heavily from the VDE standard. The primary role of the FCC has always been protection of licensed broadcast services. While the residential use model has changed, the regulations remain. Respectfully, Brent DeWitt, AB1LF Milford MA On 11/9/2024 6:52 PM, John Woodgate wrote: Yes, in Europe as well. All part of the (heavy) industrial versus residential, commercial and light industrial divide. Particularly that broadcast receivers would be 10m away from an emitter in a heavy industrial area, but only 3m away elsewhere. But that was 50 or more years ago, in the days of AM and FM, and analogue TV. It's a bit different now and will get more different. On 2024-11-09 23:38, Ken Javor wrote: On the west side of the Pond, the major discrimination (for emissions) was in the application of the class A limit at 10 meters, vs. the class B limit at three meters. The differentiator was the expected zone of control. Meaning an apartment dweller might not have control over an offending interference source more than three meters away, vs. an industrial or commercial enterprise where the zone of control would typically be larger. The same kind of reasoning would apply to conducted emissions, both from the point of view of a radiating power line, but also what culprits and victims might share the same or a close-by branch circuit. -- Ken Javor Ph: (256) 650-5261 From: "James Pawson (U3C)" <ja...@unit3compliance.co.uk><mailto:ja...@unit3compliance.co.uk> Reply-To: "James Pawson (U3C)" <ja...@unit3compliance.co.uk><mailto:ja...@unit3compliance.co.uk> Date: Saturday, November 9, 2024 at 10:19 AM To: <EMC-PSTC@LISTSERV.IEEE.ORG><mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Emissions Class A vs Class B Hello all, I’m writing some guidance on Class A vs Class B and I was thinking about the Why. As in why do we separate emissions into Class A and B? Reasons I’ve heard (which make some kind of sense even if I’ve not actually looked into the figures) include: 1. Concentration of electronic equipment – domestic premises are more likely to have other interference equipment operating in closer proximity to receivers than in a commercial/industrial environment. 1. Quantity of devices sold – consumer devices used in a domestic sphere have a much higher sales volume 1. Nature of installation – Class A equipment installed by more technically competent users, Class B installed by less knowledgeable users. Does anyone have any additional justification, historical perspective, or can point me in the direction of a standard that describes this in more detail? I’ve looked in IEC TR 61000-2-5 which, although it mostly focuses on immunity, mentions these above reasons. CISPR 16-4-4 seems to deal with statistical methods. IEC TR 61000-1-1 deals in general terms with the concept of a margin between Emissions and Immunity. But no definitions for the derivation of these Classes… Thanks in advance! All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy www.unit3compliance.co.uk<https://urldefense.com/v3/__http:/www.unit3compliance.co.uk/__;!!IJTm5Pv7pnzb!O2Y9rDj4zSb8WGGuP_UYc1Ld4ROMSE5bL6T4h2c4ANTuzbmbai84YSZY4uFv-RAn0wiUhvolhfcENTqBbohV0BI$> | ja...@unit3compliance.co.uk<mailto:ja...@unit3compliance.co.uk> +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 Office hours: Every morning my full attention is on consultancy, testing, and troubleshooting activities for our customers’ projects. I’m contactable between 1300h to 1730h from Monday to Friday. For inquiries, bookings, and testing updates please send us an email on he...@unit3compliance.co.uk<mailto:he...@unit3compliance.co.uk> or call 01274 911747. 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