David Herres

Licensed Master Electrician

David Herres is a licensed master electrician in Stewartstown, N.H. He can be reached at [email protected].

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The 10 Biggest Grounding Mistakes to Avoid

Aug. 20, 2014
Why some of the simplest grounding errors are still the most common
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Comparing the Basic Design of Stepper and Servo Motors

April 18, 2014
Exploring the basic principles behind stepper and servo motor operation.
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DC Motor Theory, Operation, and Maintenance

Nov. 15, 2013
Direct current motors remain a viable option in certain applications – and someone has to know how to service them.