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Improper charge collateral - National Institute of Standards & Technology

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http://nvlpubs.nist.gov/nistpubs/TechnicalNotes/NIST.TN.1648_2009.pdf

This article is from the National Institute of Standards and Technology, part of The US Dept of Commerce. The last two paragraphs of section 2.1 are powerful and show that 95% of residential systems checked in a large survey failed the efficiency test because they were installed incorrectly.