Spencer, It is possible to get UL 1449 approved MOVs up to 16 Amps, I think. See http://ulstandardsinfonet.ul.com/scopes/1449.html
I find that because of the added capacitance of the MOV, the leakage current can go up unacceptably. I will typically couple the MOV with a gas tube that is rated higher than the line voltage. You now have to think about the voltages of the two keeping in mind the trip points and the fact that the gas tube clamps to ground while the MOV clamps to a voltage. -doug end Douglas E. Powell Corporate Compliance Dept. Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA From: Spencer, David H [mailto:[email protected]] Sent: Wednesday, September 10, 2003 9:49 AM To: '[email protected]' Subject: MOV's (Varistors to Earth) Howdy All, I was curious if anyone out there has place a "separately certified" MOV >from Line (or Neutral) to Earth as a solution for Surge and placement in the EU. The specific application is a pluggable Type B. The OSM/EE Note 1.5.1 98/2 indicates that for Pluggable Type B (and permanently connected) equipment that provided the MOV is "separately certified" it is an acceptable option. See: http://www.lyons.demon.co.uk/cenlec01.pdf For my part this is a check to insure there are no other superceding requirements that would not allow a MOV from Line to Earth in the EU. Also, are most MOV's separately certified? Any additional information would be appreciated. Best Regards David Spencer 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: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc _______________________________________________________________ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc. 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: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
