Dear All, Today, remote powering of 48Vdc on Lan cabling (for example, to power your laptop over the LAN) is a common technology offered by many companies worldwide.
An ITE manufacturer would like to use the extra leads on a LAN cable to power up his proprietary units in the LAN system through a splitter which can deliver up to 50 Vac (max 3.0 A) power dervived from a power supply unit. Other ITE manufacturers' equipment may be connected to the same LAN by means of the cabling (not 50 Vac powered) coming out of the splitter. Question 1: I sense a problem in that the SELV voltage limits are exceeded and that a stnadard LAN cable may not have the reinforced insulation between the 50 Vac secondary hazardous voltage leads and the SELV leads. Does everyone agree? Question 2: Assuming manufacturer found a LAN cabling which meets the reinforced insulation requirements and he specifies the use of this cabling in the building, does anyone see a problem with any country code requirements (USNEC, Canada CEC, Europe, etc.)? Question 3: Does anyone see in problems with meeting the LAN international perfomance standards (IEEE, etc.)? Thank you. PETER S. MERGUERIAN Technical Director I.T.L. (Product Testing) Ltd. 26 Hacharoshet St., POB 211 Or Yehuda 60251, Israel Tel: 972-3-5339022 Fax: 972-3-5339019 Mobile: 972-54-838175 ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
