David Herres

David Herres holds a New Hampshire Master Electrician’s license and has worked as an electrician in the northern part of that state for many years. He has focused on writing since 2006, having written for such magazines as ELEVATOR WORLD, Electrical Construction and Maintenance, Cabling Business, Electrical Business, Nuts and Volts, PV Magazine, Electrical Connection, Solar Connection, Solar Industry Magazine, Fine Homebuilding Magazine and Engineering News.

What Is a Diode?

The first diodes were the cat’s whiskers used to extract audio from a modulated radio frequency signal. Then there were diode vacuum tubes that performed the same function but were...

VF Drives

Humans have made use of elevators for centuries, but real advances were not possible until the introduction of the electric motor. There had been water-hydraulic-powered elevators, and before them, human-...

Electric Motors for Elevators

The first motors operated on DC. In fact, the invention of a practical DC motor long preceded Nikola Tesla’s insight that AC would offer substantial benefits. Thomas Edison and his...

NEC Article 620: Elevators, Part 2

The conclusion of a series on the detailed examination of the National Electric Code’s impact on vertical transportation In Part One of this series (ELEVATOR WORLD, April 2012), we began...

NEC Article 620: Elevators, Part I

A detailed examination of the National Electric Code and its impact on vertical-transportation units photos by Judith Howcroft We generally think of the 19th century as the great age of...

Fire Alarm Systems and Elevator Interaction

A look at how fire alarm, sprinkler and elevator controls work together in accordance with present-day fire and electrical code mandates Elevator technology has advanced over the years in the...

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Cooper

Cooper Announced as CIBSE President Elect for 2025/26

Internal structure of the elevator smart maintenance system; image courtesy of N2 Infotech

N2 Infotech Launches AI Predictive-Maintenance Solution

image courtesy of Stannah

Stannah to Support STEM Program at NMRN

TenBerke Architects designed the proposed supertall; image via New York YIMBY.

Construction Plans and Rendering of Brooklyn Tower Revealed

image by Thomas_C_Rosenthal for Pixabay

Company Chosen to Repair Elevators in Odesa