I only pilot paper airplanes and this isn't my area of expertise, but it looks like this potential requirement originates in NEMA ICS 5 "Industrial Control and Systems: Control Circuit and Pilot Devices" and perhaps also in IEC 62314 (Solid State Relays - as a "control" relay though the word 'pilot' isn't specifically stated)
NEMA ICS-5-2017 has these NEMA and UL standards in the Section 1.1 Reference Standards list: NEMA ICS 1-2000 Industrial Control and Systems: General Requirements NEMA ICS 1.1-1984 (R1998) Safety Guidelines for the Application, Installation, and Maintenance of Solid State Control ICS 1.3-1986 (R2001) Preventive Maintenance of Industrial Control and Systems Equipment ICS 6-1993 (R2001) Industrial Control and Systems: Enclosures UL 310-1995 Electrical Quick-Connect Terminals UL 353-1994 Limit Controls UL 486E-1994 Equipment Wiring Terminals for Use With Aluminum and/or Copper Conductors UL 508-1999 Industrial Control Equipment UL 698-1995 Industrial Control Equipment for Use in Hazardous (Classified) Locations UL 873-1994 Temperature-Indicating and -Regulating Equipment This link gives short but interesting descriptions of the contact constructions for mechanical "pilot duty" and "power" types (though unrelated to SSR). https://www.totaline.com/dl/PAGE%20D6%20-%20RELAY%20APPLICATION%20DATA.pdf Cheers, Adam in Atlanta adam.di...@ieee.org On Thu, Dec 7, 2017 at 4:45 PM, Jon Keeble <j...@wattwatchers.com.au> wrote: > We are getting a somewhat innovative product through UL at the moment. > So there has been quite a lot of discussion and feedback from UL. > But when UL said they thought my little board needed a pilot rating I > really thought they were joking. > > Jon Keeble > > On Fri, Dec 8, 2017 at 8:31 AM, <n6...@comcast.net> wrote: > >> I looked at the subject line and thought about something completely >> unrelated – pilot ratings. I have a PP-ASEL IA. Private Pilot – Airplane, >> Single Engine, Land Instrument Airplane. 😊 And you? >> >> >> >> Ghery S. Pettit >> >> >> >> *From:* Jon Keeble [mailto:j...@wattwatchers.com.au] >> *Sent:* Thursday, December 7, 2017 12:29 PM >> *To:* EMC-PSTC@LISTSERV.IEEE.ORG >> *Subject:* [PSES] Pilot rating >> >> >> >> I am using a Panasonic AQH3213A PhotoMOS optical isolator to control a >> small contactor. >> >> >> >> At 110VAC the contactor coil draws 30mArms. >> >> The coil contacts are wired to a PCB via a terminal block plug and socket. >> >> >> >> On the PCB is a series 10ohm fusible resistor, and a SMBJ400AC >> bidirectional zener. >> >> >> >> When the switch opens at peak current (42mA) there is 0.1J of energy in >> the coil that gets absorbed by the zener. >> >> >> >> The zener >> >> * clamps at a voltage way below the voltage rating of the optoMOS switch. >> >> * is rated at 600W for 8.3msec and is subject to only 13W for a similar >> period. >> >> >> >> The UL test engineer says that the optoMOS should be "pilot duty" rated >> (the part I am using does have this rating). >> >> >> >> Does anyone know what triggers the requirement for a "pilot duty" rating? >> >> Is this defined in a standard somewhere? >> >> >> >> This useful link identifies "contact rating codes" >> >> https://na.industrial.panasonic.com/blog/what-pilot-duty- >> rating-how-it-obtained >> >> >> >> The lowest rating E300 is for 110V 1.8A (make) 0.3A (break) >> >> >> >> Technically speaking, my switch is not connected to the contactor .. >> there is a two-component network in between >> >> Does UL have the capacity or procedures in place to understand and accept >> a circtuit analysis that shows my circuit as safe? >> >> >> >> Jon Keeble >> >> >> >> Wattwatchers. >> >> >> >> >> >> >> >> - >> ---------------------------------------------------------------- >> >> 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 < >> emc-p...@ieee.org> >> >> 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) <http://www.ieee-pses.org/list.html> >> List rules: http://www.ieee-pses.org/listrules.html >> >> For help, send mail to the list administrators: >> Scott Douglas <sdoug...@ieee.org> >> Mike Cantwell <mcantw...@ieee.org> >> >> For policy questions, send mail to: >> Jim Bacher <j.bac...@ieee.org> >> David Heald <dhe...@gmail.com> >> > > - > ---------------------------------------------------------------- > > 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 < > emc-p...@ieee.org> > > 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) <http://www.ieee-pses.org/list.html> > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
