SCCR rating for UPS's

[mshields]

To my knowledge, the only short circuit related rating, associated with UPS's is the AIC rating of any breaker on the input side of the UPS. Is that an accurate statement?

Thanks,

Mike

 

[petersonra]

To my knowledge, the only short circuit related rating, associated with UPS's is the AIC rating of any breaker on the input side of the UPS. Is that an accurate statement?

Thanks,

Mike

a UPS is not a whole lot different from a vfd and they have short circuit current ratings that are often related to the input overcurrent protection device but not always equal to it the rating of the overcurrent protection device on the input. But that is just an observation. It seems incongruous that everything else would have to have a short circuit current rating but UPS's would somehow be exempt.

 

[Sahib]

It is user responsibility to see that a UL certification for SCCR of UPS is available, when the UPS operates in a high fault level environment such as 100kA for safety to personnel and semiconductor components of the UPS.

 

[dkidd]

To my knowledge, the only short circuit related rating, associated with UPS's is the AIC rating of any breaker on the input side of the UPS. Is that an accurate statement?

Thanks,

Mike

http://www.dvlnet.com/hs-fs/hub/29654/file-281852707-pdf/docs/sccr_whitepaper.pdf


EXECUTIVE SUMMARY
Beginning with the 2005 version of the Nation Electric Code (NEC), also known as NFPA-70, changes to the NEC impose some significant new requirements for Short Circuit Current Rating (SCCR) of electrical machinery including UPS, Air Conditioners and practically every other large power consuming or conversion device in today’s Data Center.
This code, along with OSHA and UL standards for Data Center Equipment require clear marking of SCCR on each piece of data center power and cooling equipment.
Many specifiers and end users are unaware of these new requirements and are shocked when Inspectors (Authority Having Jurisdiction or “AHJ”) halt projects or deny the use of the facility until questions regarding equipment not supplied with SCCR ratings are answered.
This document is intended to show how the codes and standards are interpreted regarding this requirement, and provide some examples for labels and revised submittal requirements.