Dear experts, I would again need your advice.
We are testing the product, that is supplied through remote CATV network via coax cable. Manufacturer would like to put on the product 90Vac rating. My questions are: - what voltages are actually used in USA for CATV? In EU we normally use max 65Vac. - how is the supply voltage generated (what are requirements for power sourcing equipment)? - can supply voltage fluctuate, similar like ac mains voltage? For normal AC mains we expect fluctuation +/-10%. - should +/- tolerances to 90V be applied? I found below text in NEC 2017, which says something about 60Vac. Is this 60V fixed value or tolerances are allowed (like 66V)? 820.15 Power Limitations. Coaxial cable shall be permitted to deliver power to equipment that is directly associated with the radio frequency distribution system if the voltage is not over 60 volts and if the current is supplied by a transformer or other device that has power-limiting characteristics. Power shall be blocked from premises devices on the network that are not intended to be powered via the coaxial cable. Thank you for your valuable support. Best regards, Boštjan Boštjan Glavič Vodja laboratorija za elektroniko/Head of Laboratory Varnost in elektromagnetika / Safety and Electromagnetics SIQ Ljubljana T +386 1 4778 265/+386 41 391 283 E [email protected] W www.siq.si A Mašera-Spasićeva ulica 10, Ljubljana, Slovenija, SI-1000 To elektronsko sporočilo je namenjeno izključno naslovniku. Pravno obvestilo. The information transmitted by this email is intended only for the person or entity to which it is addressed. Disclaimer. - ---------------------------------------------------------------- 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: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
