At 09:14 AM 11/27/00 -0600, you wrote:
Clayton,
While I appreciate the breaker info, the real question is how many amps does it draw - that way I know if I am going to have a breaker issue or not. All the Telect panels are all tied back to a real breaker panel that has 15-30a breakers (depending on the guessed load).
Marshall Morgan
One of our POPs has 6 TC shelfs with 10 DSP's each. The TC shelfs plus all the ancilliary optical and routing gear draws 90 amps or so from our DC supply. Most of the other pieces of equipment's draw doesn't amount to a whole heck of a lot, so lets assume the TC's draw around 70 amps of this. That would bring the consumption per shelf to around 11 amps. Remember, that there is inrush current when powering the units up, plus you may want a bit of a safety margin on top of it to avoid false trips, etc. It really looks like its outside of the GMT range, or at least pushing the limit on the higher end of the GMT range, particularly in the case of a failure of one of the power feeds if you're running load sharing supplies. We breaker our TC's at 25 A The only real way to measure it of course is to place a fixed value shunt in line with DC supply, and measure the voltage drop across it, and calcuate the current draw.
Internet Doorway, Inc (aka NETDOOR) http://www.netdoor.com
601.969.1434 x28 | 800.952.1570 x28 | 601.969.3629 x28 | Fax 601.969.3838 ----- Original Message ----- From: "Clayton Zekelman" <clayton@MNSi.Net> To: <usr-tc@lists.xmission.com> Sent: Monday, November 27, 2000 8:40 AM Subject: Re: (usr-tc) Power Consumption
Short answer: you can't.
Long answer: GMT fuses, although available up to 15 Amps, are generally not used in applications above 10 amps - you start running into fuseholder constraints, etc.
You should really be using either KTK or NRN style fuses, or better yet, breaker panels. See www.argus.ca - they make a nice selection of DC breakers.
We use a model from Telect also with an a/b fuse split with a mix of 4 GMT and 4 KTK per side.
P/N 009-8004-0100
At 07:44 PM 11/22/00 -0600, you wrote:
If I have 14 DSPs, 1 HiperNMC and 2 ARCs plus an integrated fan tray what will be the amps required at peak and nominal using a single or dual -48vDC 130A power supplies? I need to make sure the 25A listed on the PS is not right as I cannot find any GMT fuses and panels that support more than 15A's for each fuse and 50A per distribution panel (using Telect panels) http://www.telect.com/products/category/index.cfm?category=TRADFUSE
Marshall Morgan
Internet Doorway, Inc (aka NETDOOR) http://www.netdoor.com
601.969.1434 x28 | 800.952.1570 x28 | 601.969.3629 x28 | Fax 601.969.3838
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--- Clayton Zekelman Managed Network Systems Inc. (MNSi) 875 Ouellette Avenue Windsor, Ontario N9A 4J6
tel. 519-985-8410 fax. 519-258-3009
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--- Clayton Zekelman Managed Network Systems Inc. (MNSi) 875 Ouellette Avenue Windsor, Ontario N9A 4J6 tel. 519-985-8410 fax. 519-258-3009 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.