Hi Scott, The power cord acts as the disconnect.
Rick Linford SonicWALL -----Original Message----- From: Scott Barrows [mailto:sbarr...@curtis-straus.com] Sent: Friday, April 27, 2001 12:41 PM To: Rick Linford Cc: emc-p...@majordomo.ieee.org Subject: Re: EN60950 (UL1950, IEC 60950) On off switch marking. Hi, If the switch is being used as the disconnect device it needs to disconnect both poles simultaneously (2.6.6). 1.7.8.3 only refers to on and off indications of the equipment. So I guess I need to know if the switch is being used as a disconnect or just to turn the machine on and off. Scott Barrows Curtis Straus LLC Rick Linford wrote: > Hi All, > > When a switch opens only one leg of the mains to control power to > equipment should it be marked with the "l" and "O"? > > Background: > > Three different engineers from three different NRTLs indicated it is > permitted, two even required it. A different engineer for one of the > NRTLs and two other respected individuals indicate it is prohibited. It > will be interesting if members of this list will have the same 50/50 > split or if there is a correct answer. > > (single phase 100 to 240 VAC, 2A, 50-60 Hz, intended to be shipped US, > Canada, EU and generally internationally) > > To help, IEC 60950 (1999), section 1.7.8.3 Symbols, is shown below. > > Where symbols are used on or near controls, for example switches, push > button, etc., to indicate "ON" "OFF" conditions, they shall be the line > l for "ON" and the circle O for "OFF" (60417-1-IEC-5007 and > 60417-1-IEC-5008). For push-push type switches the symbol {line in side > the circle} shall be used (60417-1-IEC-5010). > > It is permitted to use the symbols O and l to indicate the "OFF" and > "ON" positions of any primary or secondary power switches, including > isolating switches. > > A "STAND-BY" condition shall be indicated by the symbol {line breaking > the circle at the top} (60417-1-IEC-5009). > > My bias was not included in the 50/50 statistics noted above but I > believe it is required. > > Rick Linford > Regulatory Engineer > SonicWALL > > ------------------------------------------- > 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: > Michael Garretson: pstc_ad...@garretson.org > 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://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- 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: Michael Garretson: pstc_ad...@garretson.org 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://www.rcic.com/ click on "Virtual Conference Hall,"
