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
Why Motor Circuits Break Every Rule You Learned About Conductors
The breaker protects the wire, except when it does not. Article 430 splits one job across two devices, and a locked rotor is the reason why it has to.
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A Transformer Does Not Extend the System, It Starts a New One
There is no copper path from primary to secondary, which is why the secondary arrives with no ground reference and why the system bonding jumper goes in exactly one pl...
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What a Backfed Generator Does to the Man on the Pole
A pole transformer steps up as readily as it steps down. That is the whole argument against a suicide cord, and NIOSH has the case file to go with it.
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Supply Side, Load Side and the Busbar That Cannot Take It
Two sources feeding one busbar means neither overcurrent device sees the total. The 120 percent allowance is the arithmetic that keeps that from cooking a panel.
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EV Chargers, Load Calculations and the Service Upgrade You May Not Need
An EVSE is the rare residential load that really does run flat out for hours. Which calculation method you pick decides whether the job is a breaker or a service change.
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Equipotential Bonding Is Not Grounding and Water Does Not Forgive
The bonding grid around a pool does not clear faults and does not trip anything. It removes the voltage gradient, which is the thing that actually kills a swimmer.
Read more →Code reasoning, in plain language.
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