I toured The Planet years ago in Dallas and was told by the sales rep
that A+B power was two circuits from the same PDU. :)
I consider A+B power to be two distinct feeds, separate utility
entrances, separate generators, separate UPS', PDU's, etc. Past that I
consider things like firewall separation, rated chases and such to be
customer specific requirements.
Aaron
On 10/23/2023 9:38 AM, Babak Pasdar wrote:
Hello,
I wanted to get some feedback as to what is considered standard A/B
power setup when data centers sell redundant power. It has always
been my understanding that A/B power means individually unique and
preferably alternate path connections to disparate UPS units.
A few months ago, 165 Halsey took us down for several hours. They
claimed that a UPS failed causing this issue. Our natural reaction
was that we have A/B redundant power so a failed UPS on the A circuit
should not take down the cabinet. Joe the facility manager claimed
that industry standard A/B power means two circuits to the same UPS,
which makes no sense to me.
They committed to move us to A/B power with redundant circuits to
disparate UPS units. However, we had a multi-hour outage again in
that site this weekend. At first glance it seems to be the same problem.
We have checked with all of our other data center providers who have
confirmed A/B power is in fact individually unique connections to
disparate UPS units. 165 Halsey's definition of what constitutes
redundant power seems unique. Why would anyone pay extra for a second
connection to the same UPS? However, I wanted to get feedback to see
if I am taking crazy pills here 🙂
None-the-less, we have lost all confidence in this facility.
Best Regards,
Babak
