Hi, I am designing a system which will be eventually be certified per UL 2601-1 Safety of Medical Electrical Equipment. The system will not be in contact with any patients or even be in the vicinity of the patients. It is basically a film processing system similar to a x-ray film processor. I am going to use a UPS which will allow the control computer to shut down gracefully in the event of a control system power failure.
I am considering putting a relay (coil will be connected to the load side of the facility mains breaker) on the output of the UPS which will disable the UPS output power in the event that the facility power fails, or if someone trips the mains. The UPS will continue to have an output if a power failure is local to the control system. My question is this - Is it acceptable to shield (isolate via some sort of flex conduit) the connection between the UPS and the computer so that only service personnel have access to it? Thereby eliminating the need for the relay. But, of course this does present the problem of the presence of live and potentially lethal power in the system even after the mains have been switched off. And it also removes some of the justification for the UPS in the first place. Anyone have an answer??? Thanx. Michael B. Riggio Phone: 714-348-3214 VOXEL Fax: 714-348-8665 26081 Merit Circle, Suite 117 Web: www.voxel.com Laguna Hills, CA 92653 Email: mrig...@voxel.com
