Read the UL conditions of acceptability for the PS - it probably says that the input connector was not evaluated for use as a field wiring terminal. If the terminal block is UL CCN 'ECBT2' or 'XCFR2', then it cannot be exposed to the user/operator, and is can only be exposed to qualified service personnel.
Typically, you will need a mains coupler that is IEC/UL60320 approved, with the mains wiring to the terminal block not exposed to the end user. Also, I am not certain what is a "back room" enviroment, but if C.O., then your company (SBC) has very specific requirements, depending on exposure to external voltages, that are in addition to the national differences in UL60950-1 for TNV - a very nasty and (for me at least) exciting test. luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Alex Horvath Sent: Monday, June 16, 2008 12:16 PM To: [email protected] Subject: Chassis mount PS UL considerations Hi, I'm an EE at a small company and I have to figure out the regulatory issues on my own so apologies for rudimentary nature of my question... Or product is a telcom industry product designed that will be located in "back room" type application. It is chassis based (metal) and I have selected a chassis mount, metal case AC-DC power supply that will be mounted inside the chassis. The rub here is that the inside of the chassis will be customer accessible (customer is sys admin type personnel) for routine/necessary product configuration. The chassis is accessed via 2 thumbscrews that allow a panel to swing open at which point the AC terminals on the power supply will be exposed. An example of the power supply is - http://www.v-infinity.com/adtemplate.asp?invky=1008007&catky=7645 37&subcatky1=46887&subcatky2=809398&subcatky3= which has ring terminal connections. To pass UL, I'm guessing that additional shielding will be required to cover the ring terminals. Are there detailed requirements for this type of situation or is any reasonable cover/shield acceptable? Thanks, Alex - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
