Hood Patterson & Dewar

Hood Patterson & Dewar Full service electrical & mechanical testing & commissioning firm providing 3rd-party services

Hood Patterson & Dewar (HP&D) is a customer-driven, employee-owned collaborative team of engineers, technicians, and service professionals, offering:
• Electrical, mechanical and integrated systems commissioning
• Electrical component testing
• Quality assurance and control (QA/QC) services
• Engineering consulting
• Grounding system design and assessment
• Power system studies
• Safety asses

ments and training

Established in 1982, HP&D remains widely regarded as an industry leader. Clients repeatedly depend on HP&D to assist with projects of any size, from small commercial buildings to large state-of-the art data centers, industrial plants, and mission critical facilities. HP&D is a wholly-owned subsidiary of Patterson & Dewar Engineers, Inc. (pdengineers.com), which has specialized in designing and evaluating vital electrical infrastructures for electric utilities since 1947. Together, P&D and HP&D share an unyielding commitment to preserving our tradition of excellence and integrity.

Bad ground testing leads to bad data. In data centers, missing key steps in fall of potential testing can create false r...
07/29/2026

Bad ground testing leads to bad data. In data centers, missing key steps in fall of potential testing can create false results, costly delays, and real risk. This article breaks down common mistakes—and what it takes to get grounding tests right.

DATA CENTER GROUND TESTINGThe fall of potential (FoP) test to measure the ground impedance of a data center building or substation is commonly specified as part

Ground testing accuracy depends on more than equipment—it requires sound methodology, trained operators, and transparent...
07/22/2026

Ground testing accuracy depends on more than equipment—it requires sound methodology, trained operators, and transparent data validation.

Ground testing accuracy depends on more than equipment—it requires sound methodology, trained operators, and transparent data validation.

Our engineers provide insights from arc flash analysis to voltage drop studies. Strengthen your electrical system with H...
07/15/2026

Our engineers provide insights from arc flash analysis to voltage drop studies. Strengthen your electrical system with HP&D. Learn more:

Our Powers Systems Studies Group (PSSG) offers comprehensive power system analysis and reporting with practical and useful results and recommendations.

07/04/2026
Celebrating with fireworks this Fourth of July? Keep safety first: follow local laws, keep water nearby, give fireworks ...
06/30/2026

Celebrating with fireworks this Fourth of July? Keep safety first: follow local laws, keep water nearby, give fireworks plenty of space, and leave the show to the pros whenever possible. Wishing everyone a safe and sparkling Independence Day!

In this NETA Journal article, Jacob Rioux explains how, in substation design, crushed rock not only finishes the site bu...
06/24/2026

In this NETA Journal article, Jacob Rioux explains how, in substation design, crushed rock not only finishes the site but also enhances access, erosion control, vegetation management, and personnel safety by improving touch and step potential values. The right rock is essential for building safety from the ground up.

Substation design typically calls for two to six inches of aggregate (crushed rock) as a top layer upon completion of construction. This layer serves several

Today, we celebrate the women driving innovation, solving complex challenges, and shaping the future of engineering. Joi...
06/23/2026

Today, we celebrate the women driving innovation, solving complex challenges, and shaping the future of engineering. Join us in celebrating and supporting the women who continue to inspire the next generation of engineers.

Address

Atlanta, GA

Telephone

(770) 453-1415

Website

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