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Transcript
Engineering Quality Bulletin Engineering Quality Bulletin Number: 05-05 To: All Engineering Suppliers / Planning & Design Engineering Representatives / Engineering & Installation Quality Auditors /AMC Representatives Date: Tuesday, October 17, 2005 From: QWEST Engineering Quality Assurance Subject: Central Office Fuse Panels - Placement and Use Description of Bulletin: This Engineering/Installation bulletin is to address fuse panels and their uses within Central Office lineups of IOF equipment bays. Acknowledgements to Bob Kjera for his contribution to this Bulletin. Please direct all inquiries and clarifications to him at (303) 707-8387, [email protected]. Engineering Quality Bulletins are available on line at URL http://www.qwest.com/techpub/ If you have, any questions please feel free to call. Qwest Engineering Quality Assurance Don Noffsinger 303-707-7590 mailto: [email protected] Bob Kjera (303) 707-8387 Qwest AMC Standard Configurations 1 Confidential - Internal Use Only Disclose and Distribute Solely to Qwest Employees and Authorized Persons with a Need to Know. 10/11/05 Engineering Quality Bulletin Number: 05-05 Central Office Fuse Panels - Placement and Use This Engineering/Installation bulletin is to address fuse panels and their uses within Central Office lineups of IOF equipment bays. All new equipment bays should be equipped with a fuse panel(s) to provide power to equipment in that bay. In situations where new equipment shelves will be placed in existing bays, which do not have sufficient fusing or fuse panels (except DSX bays), these options shall be used in the order of priority. 1) Add a new fuse panel to the bay powered from the BDFB or power plant. 2) Powering the shelf from an adjacent bay fuse panel taking into consideration the following: a. The fuse size. b. The load required by this fuse panel. c. The cable voltage drop and ampacity from the BDFB or power plant. d. In addition, labeling the used fuse position at the fuse panel and building a manual record in COEFM power attributes for the fuse panel is mandatory. 3) Powering the shelf from a fuse panel in the same lineup taking into consideration the following; a. The fuse size. b. The load required by the fuse panel. c. The cable voltage drop and ampacity from the BDFB or power plant. d. In addition, labeling the used fuse position at the fuse panel and building a manual record in COEFM power attributes for the fuse panel is mandatory. e. The cable from this fuse panel must be sized for a 0.25v loop voltage drop. Bob Kjera (303) 707-8387 Qwest AMC Standard Configurations 2 Confidential - Internal Use Only Disclose and Distribute Solely to Qwest Employees and Authorized Persons with a Need to Know. 10/11/05 4) Powering the shelf from a fuse panel in an adjacent lineup taking into consideration the following; a. The fuse size. b. The load required by the fuse panel. c. The cable voltage drop and ampacity from the BDFB or power plant. d. In addition, labeling the used fuse position at the fuse panel and building a manual record in COEFM power attributes for the fuse panel is mandatory. e. The cable from this fuse panel must be sized for a 0.25v loop voltage drop. 5) If only one shelf can be added into the existing bay, the shelf can be cabled directly to the BDFB or power plant. This may be done when no other option is available in order to save the cost of a fuse panel. Multiple shelves in a bay require a fuse panel. Note- This does not apply to equipment located more than one aisle away or on another floor. In those cases, a fuse panel must be cabled from a BDFB on that floor or a power plant. In miscellaneous IOF bays with a dedicated fuse panel where equipment is added and the ultimate equipment load is unknown, the engineer should select a fuse panel to provide sufficient fuse type and capacity. Typically a combination style fuse panel (KLM+GMT or TPA+GMT) with 60 amp fuses from a BDFB or power plant will provide for an ultimate drain of 48 amps for equipment placed in this bay. All new BDFB or power plant fuse assignments are to be made by the CSPEC Planner. Bob Kjera (303) 707-8387 Qwest AMC Standard Configurations 3 Confidential - Internal Use Only Disclose and Distribute Solely to Qwest Employees and Authorized Persons with a Need to Know. 10/11/05