Ohmics — automated preliminary screening. Not a stamped engineering review, not an AHJ determination, and not a substitute for the Engineer of Record. Full disclaimer.

By Jay Prigmore, Ph.D., P.E.

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Plain answers to the questions that come before a review.

Arc Flash Study Review

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8 min read

Does your arc flash study need to be redone?

A 2002-edition study is not automatically wrong. Four questions bear on whether yours needs revisiting, and three of them can be answered from the study itself, without recalculating anything.

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Transformer DGA Analysis

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10 min read

How to interpret a DGA report: Key Gas, Rogers ratios and Duval triangles

What each dissolved gas analysis method looks at, where each one goes wrong, and what to do when they disagree, and why the total combustible gas can stay low while a fault develops.

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OLPD Report Review

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10 min read

How to read an online partial discharge (OLPD) survey report

Sensors, units, noise, coverage, conditions and PRPD patterns: six questions to ask when you read a PD survey report.

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