MHE Field Notes
Plain-language writing on the code, the exams and the reasoning behind the rules — written for people already on the tools, not for a classroom.
MHE Field Notes
Class, Division and Knowing When to Walk Away
Classified areas look like ordinary work until they are not. A plain reading of Class and Division, why a spray booth and a grain leg are different problems, and the t...
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Why Emergency Lighting Gets Cut and Then Fails Inspection
Egress lighting is the easiest line item to trim off a light commercial job and the most reliable way to lose a certificate of occupancy. What Article 700 and the AHJ ...
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A Plenum Is Not Just the Space Above the Tiles
Above the grid is where wiring goes to be forgotten. What actually makes a ceiling cavity a plenum, which methods are permitted in one, and why the fire behavior is th...
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What You Can Leave Alone in Old Wiring, and What You Cannot
Knob and tube, aluminum branch circuits and ungrounded receptacles are not automatically violations. The line that matters is whether your work made an existing system...
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Temporary Power Is Where OSHA and the Inspector Diverge
Nobody inspects the temp pole the way they inspect the permanent service, but OSHA reaches it anyway. GFCI for personnel, what an assured grounding program actually re...
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Work Out What the House Actually Draws Before You Add to It
A panel schedule is a claim, not evidence, and the nameplate on the enclosure is not the service size. How to survey an existing service properly before quoting the EV...
Read more →Code reasoning, in plain language.
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