Code requires this here. The intent of the EPO buttons are to immediately disconnect all energized power to the entire facility/building in the event of a critical fault like an electrical fire or electrocution.
Only locally-battery powered low-voltage emergency lighting should still be operating. Often the next step after EPO is to flood the room... —L.B. Ms. Lady Benjamin PD Cannon of Glencoe, ASCE 6x7 Networks & 6x7 Telecom, LLC CEO l...@6by7.net <mailto:l...@6by7.net> "The only fully end-to-end encrypted global telecommunications company in the world.” FCC License KJ6FJJ > On Sep 15, 2021, at 8:58 AM, Adam Thompson <athomp...@merlin.mb.ca> wrote: > > Now I'm curious... in all of the DCs and COs I've worked in - to the best of > my knowledge, I haven't personally tested this! - the EPO button does not > switch to emergency power. It turns off ALL equipment power in the space - > no lights, no klaxons, nothing. In simpler setups, the EPO is connected to > the UPS so anything plugged in to the UPS does dark instantly. In one DC I'm > familiar with, the EPO switch kills all the UPS output and uses several > relays to kill commercial power at the same time. > In some, the room lights were not covered by the EPO switch, in some they > were. Emergency exit lamps will continue to be lit, as they have internal > batteries, and are required by building/fire code. > > Is it (somewhat) common for an EPO switch to only disconnect commercial power > and leave local redundant power live? What sort of facilities would have > this? > > -Adam > > Adam Thompson > Consultant, Infrastructure Services > > 100 - 135 Innovation Drive > Winnipeg, MB, R3T 6A8 > (204) 977-6824 or 1-800-430-6404 (MB only) > athomp...@merlin.mb.ca <mailto:athomp...@merlin.mb.ca> > www.merlin.mb.ca <http://www.merlin.mb.ca/> > From: NANOG <nanog-bounces+athompson=merlin.mb...@nanog.org> on behalf of Jay > R. Ashworth <j...@baylink.com> > Sent: September 11, 2021 22:23 > To: nanog <nanog@nanog.org> > Subject: Re: Never push the Big Red Button (New York City subway failure) > > ----- Original Message ----- > > From: "Sean Donelan" <s...@donelan.com> > > > NEW YORK CITY TRANSIT RAIL CONTROL CENTER POWER > > OUTAGE ISSUE ON AUGUST 29, 2021 > > Key Findings > > September 8, 2021 > > > > https://www.governor.ny.gov/sites/default/files/2021-09/WSP_Key_Findings_Summary-for_release.pdf > > > > <https://www.governor.ny.gov/sites/default/files/2021-09/WSP_Key_Findings_Summary-for_release.pdf> > > > > Key Findings > > [...] > > > > 3. Based on the electrical equipment log readings and the manufacturer’s > > official assessment, it was determined that the most likely cause of RCC > > shutdown was the “Emergency Power Off” button being manually activated. > > I don't even *do* datacenter for a living, and I know that when you hit the > Molly button, > > 1) A Klaxon goes off in the Data Center -- one that sounds *different* from > the Halon Klaxon, in both cadence and tone (just for a couple bursts), and > > 2) Yellow rotating beacons turn on, and stay on while you're on Emergency > Power. > > Yes, real honest-to-ghod *rotating mechanical beacons*, none of this flashing > LED > crap. > > Clearly, it's important that the use of Emergency Power be annoyingly > noticeable. > > Cheers, > -- jra > -- > Jay R. Ashworth Baylink > j...@baylink.com > Designer The Things I Think RFC 2100 > Ashworth & Associates http://www.bcp38.info <http://www.bcp38.info/> > 2000 Land Rover DII > St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
