And not least, for pole-mounted red light cameras, you need shotgun protection. :)
The first red light camera installed here (Vancouver) was dealt with rather quickly in this manner. Bob Wilson TIR Systems Ltd. Vancouver. -----Original Message----- From: Robert Johnson [mailto:john...@itesafety.com] Sent: March 6, 2002 12:23 PM To: 'Peter Merguerian' Cc: emc-p...@majordomo.ieee.org Subject: RE: Don'r Get Caught Running a Red Traffic Light! Peter, For your equipment special consideration of transient levels is needed. Refer to annex G of 60950. If you power the pole mounted equipment from overhead lines as do streetlights, you are likely to be overvoltage category IV which might mean mains transient levels of 4 or 6 KV. If the camera is remotely powered from inside a building, you might treat the installation as TNV3, where 1.5 KV is the assumed transient level (2.10.3.3 note 2) unless you know otherwise. Don't forget you need lightning protection considerations. (References are to IEC 60950-1 (2001-10) Ed. 1.0) Bob Johnson ITE Safety ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
