HP&D news and information blog
Conduit bushings play an important role in preventing damage to conductor insulation where the conductors pass through panelboard enclosures and tap box openings. Lately, we have seen numerous instances of plastic bushing inserts missing, displaced, or damaged, to the point where they no longer prevent the conductors from contacting the sharp edges of the equipment. The electricians were aware that the bushings were broken at one site but did not deem the situation important enough…
Greenfield data centers are built the same way most other facilities are built: the building schedule is driven by constructability. From design through turnover, the primary and often the only driver is efficient, linear construction. While this makes perfect sense for most facilities, this traditional process leads to copious issues involving commissioning, schedule, and budget in a data center. The data center MEP equipment’s criticality creates a need for commissioning that far exceeds the typical…
Patterson & Dewar Engineers, Inc. (P&D) is pleased to announce it has been selected as one of the Atlanta Journal Constitution’s 2021 Top Workplaces. The Top Workplaces list is based solely on employee feedback collected through a survey administered by Energage LLC, a third-party employee engagement technology partner. The anonymous survey measures 15 culture drivers critical to an organization’s success, including alignment, execution, and connection. P&D is an employee-owned company, and as Mike Bryan, President…
Ground Grid Design & Soil Electrical substations are built across the country, comprising a wide range of dimensions and voltages from 4.16kV up to 500kV. These substations are subject to electrical faults, of which 80% are single line to ground (SLG) faults. These fault currents can vary from a few hundred to many thousands of amperes. When designing an electrically safe substation, the cornerstone of any site is the native soil resistivity. Prior to design,…
Hood Patterson & Dewar is pleased to be in the top tier of the 25 firms recognized on the Consulting-Specifying Engineer’s 2020 Commissioning Giants list for the second consecutive year. HP&D reported a commissioning revenue of $30.1 million. The magazine’s report is based on annual commissioning revenue of firms of all levels, including new or existing buildings, whole building, recommissioning, monitoring-based, fire protection systems, building enclosure (envelope), emergency power systems, retro-commissioning, and communications systems. Established in 1982, HP&D remains widely regarded as a leader in electrical and mechanical testing, commissioning,…
Hood Patterson & Dewar is pleased to announce our designation as one of the newest NETA accredited companies. NETA Accredited Companies are third-party, independent electrical testing and engineering service businesses providing full-service testing, analysis, and maintenance of electrical power systems. NETA maintains a two-fold accreditation process that accredits the company and certifies its individual technicians. The accreditation standards assure consumers of both the qualifications of the company as well as the credentials of the individual…
Hood Patterson & Dewar is pleased to be among the 25 firms named to Consulting-Specifying Engineer’s list of 2019 Commissioning Giants. New to the list this year, HP&D reported commissioning revenue of $12.5 million. Established in 1982, HP&D remains widely regarded as a leader in electrical and mechanical testing, commissioning, and engineering services. HP&D is a wholly-owned subsidiary of Patterson & Dewar Engineers, Inc., which has specialized in designing and evaluating vital power delivery infrastructures…
Hilton Mills is a featured speaker at CEATI International’s 2019 Grounding and Lightning Conference on October 9th in Houston, TX. The conference brings together leading subject matter experts from around the world. Hilton will present What Lies Beneath: Testing the Safety of Aging Grounding Systems, during which he will discuss the fall of potential (FoP) and computer-based test instrument (CBTI) methods for testing ground grids, common pitfalls encountered when testing energized electrical substations, plants, and…
The Spring issue of NETA World contains an interesting article on testing grounding systems written by regular contributor, Jeff Jowett, a Senior Applications Engineer for Megger. Jowett explains why, “for large and complex grounding systems,” SmartGround® Multimeter (SGM) in the hands of a qualified grounding specialist “affords incontestable results.”
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