Dear All, I have a wireless PBX system which is Approved. The manufacturer has added an a card module which interfaces with an outdoor base station. The outdoor base station is within a polymeric box and receives /transmits E1 and 48 Vdc 0.6 A from/to the card module of the PBX. Speaking of UL1950 Third Edition:
1. Does the outdoor box have to meet UL 50 or is it enough to meet the UL1950 Third Edition requirements (which are flammability tests and an IP rating). I assume that in the case of UL1950, it is not necessary to have the plastic rated for Ultravilolet Resistance and suitability for water exposure/immersion (other the IP watertightness tests). Note: An outdoor box evaluated under UL1459 would have to meet UL50 (Standard for Enclosures for Use in Electrical Equipment). 2. Is an IPX4 rating good enough for the box which is mounted to an outdoor pole (subjected to rain, snow, and occasional exposure to ice)? 3. What is the designation of the E1/48 Vdc interface to the base station? It should be noted that the E1 is not connected to the PSTN. Can this interface be considered as SELV even though it is connected outside the building similar to a 100 BaseT Fast Ethernet connection? 4. The means of connection to the 48Vdc/E1 at the base station is a muti-pin UL Recognized connector. Assuming that the manufacturer limits the power in the PBX card module to Class 2 levels, I am correct to state that there is no risk of fire or electrical shock and/or energy within the base station, and A. The box may therefore be rated minimum 94HB (in lieu of 94-5V for fire enclosures - fixed equipment)? AND B. The multi-pin connector is acceptable (ie no need for permanent connection to supply for fixed equipment). The only requirement would therefore be for the installer to use Class 2 wiring/cable between the PBX and the outdoor base stations? AND C. An IP rating for the box is irrelevant for safety but may be relevant to the functioning of the equipment? Thank you all who have responded to my UL1950 Rack Questions and hope that many more can take a shot at the above questions. Regards, PETER S. MERGUERIAN MANAGING DIRECTOR PRODUCT TESTING DIVISION I.T.L. (PRODUCT TESTING) LTD. HACHAROSHET 26, P.O.B. 211 OR YEHUDA 60251, ISRAEL TEL: 972-3-5339022 FAX: 972-3-5339019 E-MAIL: [email protected] Visit our Website: http://www.itl.co.il --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
