From: Richard Parker [mailto:richardparkerdc@gmail.com] 

Sent: Saturday, December 17, 2011 11:40 AM 

To: Timothy Ballo 

Cc: Freeman, Jeremiah (CONTR); rick.anderson@faypwc.com; ScottB@LVMetals.com; 

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Robert Carmichael; Christopher Lau 

Subject: Re: LVDT Working Group on Data Center Transformers 

Thanks to Tim, Tom and Vijay for their good work on this. I look forward to reviewing the draft 

and discussing it on the call on Tuesday. 

All best, 

Richard 

On Sat, Dec 17, 2011 at 1:09 AM, Timothy Ballo <tballo@earthjustice.org> wrote: 

All, 

Attached is the product of the LVDT work group tasked with coming up with a regulatory 

approach for low-voltage dry-type transformers intended for use in data center applications. Our 

intent was to identify a set of criteria capable of distinguishing data center transformers from 

more typical LVDT units, recognizing the significant variation that exists even within the 

universe of data center transformers. We settled on three principal criteria: (1) a nameplate 

designation; (2) a maximum inrush current limit; and (3) any two other design attributes from a 

checklist of potential features. 

The standards recommended are EL0 - retaining the 2010 standard levels as is. 

The attached presents a short-term fix, but a long term solution to better address these units may 

need to include an effort to develop a testing protocol that better reflects the unique loading 

profiles of data center transformers, so that a future efficiency standard for these units can better 

achieve real-world energy savings. 
Tom Patzner and Vijay Tendulkar deserve the vast majority of the credit/blame for the content of 

the attached. We look forward to discussing the proposed approach on Tuesday's call. 

Thanks. 

-Tim Ballo