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Timothy Coyle, P.E.

Coyle is a senior electrical engineer with HDR (Minneapolis).

ARTICLES

Calculating Backup Power Supply Requirements

Different types of load, from uninterruptible power supplies to VFDs and beyond, make for different approaches to your specific backup power situation.
April 1, 2014
Read up to protect your facility’s equipment and its ability to perform in a pinch.
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Current Affairs: Be in control of Code Requirements

March 25, 2006
In my experience, one of the trouble spots in project specifications is coordinating the control panels furnished with mechanical equipment with the standards that apply to the balance of electrical equipment on the project. Regardless of what you may include about NEMA enclosure types, short-circuit ratings, and other features, manufacturers tend to supply their standard control panel. The result is often an installation that cannot be verified to meet code or project requirements.
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Current Affairs: A Better Meter Made

February 3, 2006
Microprocessor-based systems greatly increased the power and flexibility of BMS while lowering the cost of sophisticated control. A similar evolu-tion in electrical metering and protection devices has increased the amount of power system information available to building operators.
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Torque Is The Key

October 1, 2005
For motors in certain applications, the boilerplate approach to specification and design will get the system stopped because the motor won't start. Consider voltage, speed, and torque for these special instances, and follow along with the Case Of The Not-So-Centrifugal Pump Curve and the Case Of The Frequent Motor Failure to do some real-life motor- starting sleuthing. By Tim Coyle, P.E.
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Current Affairs: Mea Culpa

September 30, 2005
And in electrical equipment rooms: to sprinkler or not to sprinkler?
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Current Affairs: Keep In The Clear!

May 31, 2005
The NEC insistence on a wide berth isn't just a power trip.
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Current Affairs: Ground Rules

March 29, 2005
Don't ground in isolation.
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Current Affairs: Lightning And Surge Protection

January 30, 2005
How does the Faraday cage help buildings shrug off a bolt from above?
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Current Affairs: More About Ground

November 29, 2004
Every safe electrical system requires an effective conductor.
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3/25/14 2:00 pm EST

Improving Cooling and PUE in Existing Data Centers

On-Demand This webinar will provide cost-effective practical tips and feasible retrofit solutions that can be implemented in operational data centers to address some cooling issues and improve energy efficiency.

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2014 April

Check out the April 2014 issue of Engineered Systems, with features on backup power supply requirements, cyberattacks, and much more!

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Design Flaws

Following up on Howard McKew's April "Tomorrow's Environment" column: Have you ever thought twice about reporting problems with another firm's design? What did you do?
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