Never push the Big Red Button (New York City subway failure)
Jay R. Ashworth
jra at baylink.com
Wed Sep 15 18:54:23 UTC 2021
----- Original Message -----
> From: "Adam Thompson" <athompson at merlin.mb.ca>
> 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?
No... I just hadn't had my coffee yet that morning and I crossed the streams.
That should be the response to the *ATS cutover*, not the Molly switch.
If someone hits the Molly button, you don't *need* an alarm. :-}
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra at baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII
St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
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