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- - Why an 80% cushion? (http://www.datacentertalk.com/forum/showthread.php?t=28288)

nickyfzr

05-23-2011 06:30 PM

Why an 80% cushion?

Hello all
New to this forum and kind of new to data centers. My question is why do we not go above 80% of a power strips rating and would it be okay to ocassionaly go over that 80% limit without surpassing the total breaker rating.

Thanks in advance for your time.

Nick

kdebs

05-25-2011 02:45 PM

That 80% is mandated in the USA by the National Electrical Code. For continuous use (3 hours or more, i.e. servers that are always on inside a data center), circuit breakers are rated at 80% of their nominal capacity. It's okay to go above 80% use, but it's not okay to stay there.

emad	06-04-2011 11:54 AM

So do you think it is only for US datacenters?

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