Re: [j-nsp] 208v power and 110...
On Thu, 10 May 2018, David B Funk wrote: auto-sensing is pretty ubiquitous, you'll find it in many consumer devices such as the wall-wart for charging your phone/PDAs. Look at the power input rating label on a device, if it says "100-240" then it's auto-sensing and you're good to go. Be careful with wall-warts. If it doesn't explicitly say that it will work at 240V, or it's not clear that it will, don't try to plug into a higher voltage outlet. Many wall-warts are still floating around that don't work at >120 VAC and will instantly release their magic smoke... The other thing is if you use PDUs that have IEC C13 connectors for 120V devices, you might need IEC-C14 <-> NEMA 5-15R adapter cords, an appropriate PDU with NEMA 5-15R or 5-15/20R recaptacles, or some NEMA 5-15/20R convenience outlets to provide a place to plug in those wall-warts. jms ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] 208v power and 110...
Date: Wed, 9 May 2018 14:26:13 -0700
From: mike+j...@willitsonline.com
To: juniper-nsp@puck.nether.net
Subject: Re: [j-nsp] 208v power and 110...
On 05/09/2018 10:52 AM, Scott Martin wrote:
> Almost all equipment these days will run on 208V, in fact, everything
> I've seen over the last ~10 years will auto switch from 100V - 240V
> single phase 50/60Hz. (unless 208V is the minimum voltage, of course...)
>
> 208V is the way to go, imho. If you have high density racks, 8kVa or
> larger, I'd go with 415V 3? which is 240V phase to neutral if that is
> an option.
Thanks (and to you other kind folks who replied). I feel a lot better
now. Just didn't want to be stupid here and have wrong and dangerous
ideas about how or what to do. No idea about the auto-switching but I
guess that makes good sense (bad pun?).
Mike-
Given that many places in the world have standard wall-outlet voltage of
230-240, most manufacturers support higher voltage.
In the really old days you had to spec the appropriate PS for the voltage in
your target area. In the not-so-old days there was a little switch on the back
of the PS that selected 115/230 volts input range.
For almost everything these days the additional cost of the auto-sensing
switching circuitry is at parity with the cost of the mechanical switch and the
improvement in customer satisfaction makes it the clear win.
(customer neglects to set switch, plugs it in, magic smoke escapes, customer is
unhappy ;).
auto-sensing is pretty ubiquitous, you'll find it in many consumer devices such
as the wall-wart for charging your phone/PDAs.
Look at the power input rating label on a device, if it says "100-240"
then it's auto-sensing and you're good to go.
--
Dave Funk University of Iowa
College of Engineering
319/335-5751 FAX: 319/384-0549 1256 Seamans Center
Sys_admin/Postmaster/cell_adminIowa City, IA 52242-1527
#include
Better is not better, 'standard' is better. B{
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Re: [j-nsp] 208v power and 110...
On 05/09/2018 10:52 AM, Scott Martin wrote: Almost all equipment these days will run on 208V, in fact, everything I've seen over the last ~10 years will auto switch from 100V - 240V single phase 50/60Hz. (unless 208V is the minimum voltage, of course...) 208V is the way to go, imho. If you have high density racks, 8kVa or larger, I'd go with 415V 3ø which is 240V phase to neutral if that is an option. Thanks (and to you other kind folks who replied). I feel a lot better now. Just didn't want to be stupid here and have wrong and dangerous ideas about how or what to do. No idea about the auto-switching but I guess that makes good sense (bad pun?). Mike- ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] 208v power and 110...
Almost all equipment these days will run on 208V, in fact, everything I've seen over the last ~10 years will auto switch from 100V - 240V single phase 50/60Hz. (unless 208V is the minimum voltage, of course...) 208V is the way to go, imho. If you have high density racks, 8kVa or larger, I'd go with 415V 3ø which is 240V phase to neutral if that is an option. On 2018-05-09 13:38, mike+j...@willitsonline.com wrote: Hi. I now have an MX240 router and my god what a beast this is! My system has the 'high line' 208v power supplies and this is my first time dealing with non-110v ac power. I have the two power supplies installed and I am thinking I may want to add a switch to this configuration and to date, I have no experience with any switches using this high of juice. I'm looking for something with 10G sfp+ interfaces and I'm just at a loss as this is a different world. Is the strategy in this situation that I need to commit to everything being high voltage, or do I get a power strip of some kind to feed my 110v stuff? Mike- ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] 208v power and 110...
https://www.juniper.net/documentation/en_US/release-independent/junos/topics/concept/power-supply-mx240-ac.html You can run the power supplies on either 120v or 208/240v . If you use the lower voltage, you need 4 power supplies for redundancy. If you use the higher voltage, you only need 2 for full redundancy. You decide what kind of power to use by what you already have available, how many power supplies/circuits you have, etc. If you are in a position to decide what kind of power to make available, then choose the higher voltage if possible--it is more efficient and requires fewer power supplies. On Wed, May 09, 2018 at 10:38:50AM -0700, mike+j...@willitsonline.com wrote: > Hi. > > > I now have an MX240 router and my god what a beast this is! > > My system has the 'high line' 208v power supplies and this is my first time > dealing with non-110v ac power. I have the two power supplies installed and > I am thinking I may want to add a switch to this configuration and to date, > I have no experience with any switches using this high of juice. I'm looking > for something with 10G sfp+ interfaces and I'm just at a loss as this is a > different world. Is the strategy in this situation that I need to commit to > everything being high voltage, or do I get a power strip of some kind to > feed my 110v stuff? > > > Mike- > > -- > Mike Ireton > Your Town Online, Inc ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
Re: [j-nsp] 208v power and 110...
On Wed, May 09, 2018 at 10:38:50AM -0700, mike+j...@willitsonline.com wrote: > My system has the 'high line' 208v power supplies and this is my first > time dealing with non-110v ac power. I have the two power supplies > installed and I am thinking I may want to add a switch to this > configuration and to date, I have no experience with any switches using > this high of juice. I'm looking for something with 10G sfp+ interfaces > and I'm just at a loss as this is a different world. Is the strategy in > this situation that I need to commit to everything being high voltage, > or do I get a power strip of some kind to feed my 110v stuff? Almost all gear of this nature in the last decade or two has auto-sensing power supplies so they can switch automatically from 120V to 208V to 240V depending on where they are in the world. Most likely you can run your existing 120V gear at 208V without a problem, BUT OF COURSE CHECK OUT THE SPECS on what you have to make sure this is possible. If you have your 208V feeds coming out to a power strip with C19 and C13 outlets, you just need to have the appropriate power cord to go from your gear to the C13 outlet and run it at 208V. Running 208V only is very standard in many data center environments. Not much to be scared about. NB: You use the same amount of "juice" on 208V, your voltage is higher, but your current is lower. So less risk of heating up the wires, less current flowing in the wires, etc. Its only when the voltage goes into the 480V range that you have to worry about a whole new world of problems. ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
[j-nsp] 208v power and 110...
Hi. I now have an MX240 router and my god what a beast this is! My system has the 'high line' 208v power supplies and this is my first time dealing with non-110v ac power. I have the two power supplies installed and I am thinking I may want to add a switch to this configuration and to date, I have no experience with any switches using this high of juice. I'm looking for something with 10G sfp+ interfaces and I'm just at a loss as this is a different world. Is the strategy in this situation that I need to commit to everything being high voltage, or do I get a power strip of some kind to feed my 110v stuff? Mike- -- Mike Ireton Your Town Online, Inc ___ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
