'Not over 60 V' does not allow 66 V. The limit implies 54.5 V ± 10 %.
On 2026-02-27 11:10, Boštjan Glavič wrote:
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
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Boštjan Glavič
Vodja laboratorija za elektroniko
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Head of Laboratory
Varnost in elektromagnetika / Safety and Electromagnetics
SIQ Ljubljana
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