Did anyone reply? How about a socratarian reply (a la Gary Tornquist)? For 'safety' relay -> do you need EN954 conformity? Is there an implied requirement for a lock-out/positive power control function?
SSRs are easy to use, but can be leaky. Is that an issue? Current interrupt devices can be considered mandatory where equipment intended to be powered has no protection -> rated for the fault current of the intended operating mains OV class? Read where 1010 and 950 talk about equipment with mains receptacles? Probably should consider switching both poles. There can be problems with some Class II equipment and the way that some national code does wiring, and the way that some peoples' brains are wired. Brian -----Original Message----- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Kunde, Brian Sent: Monday, November 05, 2012 10:25 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: IEC 60320 Outlet Safety I'm working on a device (laboratory equipment) which will have a standard 10 amp IEC 60320 Inlet connector. We also want to supply AC Mains power to an external device through an IEC 60320 OUTlet connector. We want to control (switch) the OUTlet connector with a relay so we can turn the external device on and off. Questions regarding safety IEC/EN 61010-1: 1. Does the relay have to be double pole or will a single pole relay be ok (the device can operate at either 115VAC or 230VAC in different power systems around the globe). 2. Does the relay have to be a safety relay or can we just control one pole using a solid state relay which could fail open or closed? Either condition is not likely to cause a hazard within the external device. 3. Does power to the OUTlet connector have to be removed with the ON/OFF switch (disconnect device) within the main instrument? Can this outlet always be HOT or at least one leg be HOT assuming a single pole relay is open? Are there international symbols that explain "switched" or "unswitched" outlet connectors? 4. If the OUTlet connector and wiring is rated to handle the same current from the Mains Inlet, do we have to have a circuit breaker or fuse on the Outlet? And if so, does it have to be a double pole breaker/fuse or just a single pole ok? As you can guess, my questions are related to there being Mains Voltages on the Outlet connector relative to PE or Neutral when the control relay is open, circuit breaker or fuse is open, or even when the instrument is turned off. Are any of these conditions prohibited? The external device we are powering (external stand-a-lone pump) has warning labels about disconnecting power cord prior to servicing. We have been told in the past that switching and protection of an Outlet Connector has to be double pole for safety, but I do not see anything specific in the standard and this device we are working on is to be a low cost device so we are trying to save money on the components if we can and maintain a safe product. Thanks for any input. The Other Brian
