| | | | | | Without question, electrical equipment that has not been maintained properly or is not functioning properly poses a significant additional risk to those who are working on that equipment and its associated systems. NFPA 70E states that we must address and consider conditions of maintenance for applications (e.g., estimating the likelihood of severity... |
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| | | Renewable energy generators with power-electronic switched-mode generators are a newer technology that has the possibility to generate harmonics in even higher frequencies than traditionally experienced — in some cases from the 35th to the 2,500th harmonic (2 kHz to 150 kHz), which are termed “supraharmonics.” Will these high-frequency harmonics be... |
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| | | In this episode of “EC&M Tech Talks,” Randy Barnett, a journeyman electrician, inspector, author, trainer, and electrical safety expert, discusses the requirements of the 2023 National Electrical Code for making electrical connections. Specifically, this information is found in Sec. 110.14 Electrical Connections. |
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| | | Editor-in-Chief Ellen Parson and NEC Expert Russ LeBlanc discuss some of the most significant changes to the 2023 edition of the National Electrical Code. This episode highlights Sec. 406.12 and revisions made to tamper-resistant receptacles requirements. |
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| | | This article is part of a multi-part series on how to identify, monitor, diagnose, and deal with harmonics in electrical power systems. Last month’s column discussed how to take the data gathered when measuring harmonic levels and develop mitigation or reduction techniques for lowering total harmonic distortion (THD). This month, we will expand on ... |
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| | | This article is part of a multi-part series on how to identify, monitor, diagnose, and deal with harmonics in electrical power systems. Last month’s article discussed how to determine if current and/or voltage distortion levels were sufficiently high to classify a power quality issue as a harmonic problem. This month, we’ll review how to take the data... |
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| | | In last month’s column, I addressed the question of what harmonics is and why you should care. In this installment of our multi-part series on power quality topics, we’ll move on to how to identify, monitor, diagnose, and deal with harmonics in electrical power systems. |
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| | | Case study demonstrates the importance of looking before you leap when investigating PQ problems. The operator of a large solar farm was experiencing nuisance interruptions, causing significant downtime. Read on to see what the power quality investigation uncovered. |
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| | | Article 455 provides the requirements for installing phase converters [Sec. 455.1]. Before installing a phase converter, read the nameplate to ensure the unit you have matches the drawings and specifications. The nameplate must be permanent and provide the six bits of info required by Sec. 455.2 (seven requirements if it’s a rotary-phase converter)... |
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| | | Jim told you all of the PMs have been optimized per engineering analysis and the CMMS shows they are being duly carried out. But the scuttlebutt being relayed to the plant manager is “the new PMs” are actually causing equipment failures. Jim’s in the perfect position to be the scapegoat for the shortfall and could be fired for it. He asked you to figure... |
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| | | A facility recently transferred from their temporary power feed to a new permanent feed. The facility’s hydraulic pump ran smoothly when connected to the temporary feed, along with other construction equipment. However, when the pump was connected to the new switchgear, it would no longer start. |
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| | | When the manufacturers of plastic products have operational challenges, thin profit margins magnify every bump in the process. |
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| | | NECA 2023 has begun in Philadelphia! The editorial team of EC&M is at the show and got a chance to check out all of the latest product innovations being showcased on the show floor. As always, this year’s show has a great selection of products designed to help electrical contractors work more efficiently, safely, and quickly. In this gallery, we're... |
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| | | The editorial team of EC&M is having a great time so far meeting with readers and checking out the latest product innovations highlighted at NECA 2023 in Philadelphia. Flip through these slides to see the products that caught Group Editorial Director Mike Eby’s attention on the second day of NECA. If you missed his Day 1 picks, check out the photo ... |
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| | | NECA 2023 in Philadelphia has come to an end. The Editorial Team of EC&M is at the show and got a chance to check out plenty of the latest products being showcased on the show floor. Today, we bring you the final installment of Group Editorial Director Mike Eby’s NECA product picks. |
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| | | Jim told you all of the PMs have been optimized per engineering analysis and the CMMS shows they are being duly carried out. But the scuttlebutt being relayed to the plant manager is “the new PMs” are actually causing equipment failures. Jim’s in the perfect position to be the scapegoat for the shortfall and could be fired for it. He asked you to figure... |
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| | | Article 455 provides the requirements for installing phase converters [Sec. 455.1]. Before installing a phase converter, read the nameplate to ensure the unit you have matches the drawings and specifications. The nameplate must be permanent and provide the six bits of info required by Sec. 455.2 (seven requirements if it’s a rotary-phase converter)... |
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| | | Take this quiz about U.S. electricity consumption and enter for a chance to win a $25 gift card to Amazon, iTunes, or Cabela’s! |
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