Jul
01

NEC 2020 code new standards in GFCI protection

During the recent 2020 code review, panel members of the National Electrical Code (NEC) approved changes to ground fault circuit interrupter (GFCI) protection. Those changes dramatically reduce the dangers associated with electrical hazard and shock. The most significant change is the increase of amp protection ratings across all receptacle outlets, both indoor and outdoor, wherever GFCI protection is required. In this blog, I'll discuss how that change informs:

GFCI language expansion
Better protection for basements
Safer equipment maintenance for workers
Safer outdoor outlets
Sweeping global language changes
Further expansion of 50-amp protection

Some updates highlighted in this discussion apply to long-standing requirements. With that, a need for further clarity may still exist in the Code. However, I can say without hesitation that the NEC's 2020 GFCI updates significantly enhance electrical safety for homeowners and electrical workers alike.


GFCI language expansion

The 2020 change

Code-making panel 2 (CMP 2) updated text to read, "All 125-volt through 250-volt receptacles installed in the locations specified in 210.8(A) (1) through (11) and supplied by single-phase branch circuits rated 150 volts or less to ground shall have ground fault circuit interrupter protection for personnel." In layman's terms, the NEC removed amp values across all amp-rated receptacle outlets requiring GFCI protection in the areas listed in this section.

The rationale for change

NEC 2017 language only accounts for 15- and 20-amp receptacle outlets for dwelling units. During 2020 code review meetings, panel members agreed that hazards always exist; if 15- and 20-amp receptacle outlets present a hazard, that hazard also exists on 30-amp and higher receptacle outlets. However, it was difficult to understand the likelihood of a hazardous occurrence when weighed against expanded requirements. Recent home-based electrocution accidents – a 10-year-old girl behind an energized appliance, a child in Oklahoma retrieving a pet behind a clothes dryer, a 10-year-old Houston boy playing hide and seek — helped panel members realize the need for change. In light of these tragic events, we now have a requirement that sets a higher standard across more areas of the Code, though there are some exceptions discussed later in this blog.

What might the future hold?

The NEC mandates GFCI protection in many areas of the home: bathrooms, garages, outdoor receptacles, crawl spaces, basements, kitchens and anything within six feet of a sink or water source. While that may seem like a lot, the entirety of a home is not covered. The reality is when people have a problem with a tripped circuit, it's entirely possible they'll use an extension cord to plug into a receptacle outlet that's not GFCI protected. Doing so does nothing to eliminate the original hazard potentially caused by the device in use. I hope that NEC members account for the human factor and require GFCI coverage throughout the home during the next code review.



Better protection in basements

The 2020 change

The NEC expanded GFCI protection for dwelling units with basements both finished and unfinished.

The rationale for change

Often afterthoughts that present unique hazards, basements are typically not as well maintained as other areas of the home. Further, environments are often wet and damp, and moisture is a great conductor. These code updates help ensure that accidents due to factors such as leakage current and contact with water are considerably lessened or eliminated.

What might the future hold?

Many rooms in a home are already required to have GFCI protection. While it feels like the most logical code progression, others in the industry still pushback on requiring GFCIs throughout a home claiming financial concerns or installation problems. As with the parental language update, I believe this code change can inspire discussions to include GFCIs throughout the home.


Safer equipment maintenance for workers

The 2020 change

The NEC expanded GFCI protection under Article 210.63(A) for HVAC equipment and Article 210.63(B) for indoor service equipment and indoor equipment requiring dedicated space.

The rationale for change

Equipment location is at the crux of this update. While HVAC equipment in the basement is covered now that all basement circuits are GFCI protected, HVAC equipment located in attics and other areas would likely not have GFCI protection. CMP 2 recognized that many HVAC areas are typically tight working spaces where technicians perform justified energized work (they can't troubleshoot a de-energized circuit). In essence, the update assures equipment requiring service has a GFCI-protected receptacle outlet for ready access.

What might the future hold?

Because this is the NEC's first venture into expanding 210.63, I expect some inspectors and contractors may not see eye to eye on code language. Industry discussions across the country and during future review cycles will help the NEC make future improvements.


Safer outdoor outlets

The 2020 change

The NEC updated the Code for outdoor outlets supplied by single-phase branch circuits rated 150 volts to ground or less, 50 amps or less. Key to this update: it extends beyond receptacle outlets to include all outlets. Now all hard-wired equipment falls under the Code's purview.

The rationale for change

One downfall of the electrical business is that it's more reactive than proactive, with accidents often the catalyst for change. Numerous incidents inspired this code change, including an accident involving a 12-year-old boy who jumped over a fence and touched an AC condenser unit with an electrical fault. The outer metal housing was electrified and the child was fatally electrocuted immediately upon coming in contact with the condenser and fence simultaneously.

What might the future hold?

GFCI technology is unforgiving in that it's built to detect even the slightest power variance, and when expanded to include outlets impacting new types of loads, questions arise. With GFCIs installed, leakage-current trips may be near constant, rendering large equipment unusable. In the future, I hope industries rethink products with acceptable leakage current, hertz and frequency values to reduce future compatibility issues.

Further, this change will likely spur discussions related to current GFCI requirements focusing only on receptacle outlets. Hardwiring equipment does not eliminate the electrical hazard. I venture someone will propose public inputs during the next code-review cycle to challenge details about receptacle outlets versus outlets requiring GFCI protection.



Sweeping global language changes

The 2020 change

The NEC reviewed all locations with a GFCI requirement and aligned with Article 210.8. Updates were made in many locations to include text, such as "in addition to the requirements of 210.8" and similar, to clarify language and eliminate misinterpretation.

The rationale for change

The NEC included Article 210.8(B) for other than dwelling units in 1993. Before its inclusion, builders relied on requirements in later chapters of the Code (chapters five through seven), for safety guidance. For example, RV Park GFCI requirements added in 1978 aligned with 210.8's 15- and 20-amp receptacle outlet GFCI protection philosophy at that time. NEC 2017 created some confusion when 210.8(B) increased GFCI protection requirements beyond 15- and 20-amp receptacle outlets for other than dwelling units. This presented a challenge: a chapter two requirement applied a generally wider level of GFCI protection. This conflicted with chapter five, which has less coverage of GFCI protection.

The correlating committee recognized similar conflicts exist across industries and formulated a task group that challenged every code panel to look at their GFCI requirements and attempt to align them with 210.8's 50-amp increase.

What might the future hold?

Each code panel performed their review; some made changes, others did not. There is room for discussion in future revisions of the Code regarding shock hazards in the special other than dwelling unit applications. I believe the NEC will soon increase its focus on GFCIs and hopefully add clarity as each application in chapters five through seven approaches GFCI protection differently.



Further expansion of 50-amp protection

NEC articles to watch

While representatives in agriculture and RV industries have valid concerns about nuisance tripping, I believe the NEC should revisit Article 547 for agricultural buildings and Article 551 for RVs and RV parks to address valid shock hazard concerns and consider increasing GFCI protection to 50 amps.

The rationale for change

Farming and RV industries rely on circuits that operate at well over 20 amps, yet no safety requirements exist. Much of the equipment used in these industries can be quite old with leakage current a serious concern. In my opinion, the Code lacks parity in how safety requirements exist in some industries and not in others. That must change.

The studies needed to promote change exist. The University of Iowa and the University of Nebraska have uncovered many incidents where farmers lost their lives due to faulty agricultural electrical equipment. Further, RV "hot skin," a situation where the entirety of an RV's outer housing becomes energized due to electrical faults, can kill in an instant, as was the case when a young boy died when touching an RV. If RV parks and farms running 30- to 50-amp receptacles without GFCI protection is not deemed a concern worth addressing, how can anyone claim running 30- to 50-amp receptacles outside of dwelling units is a hazard? Common sense dictates both are hazards and change is necessary.

What might the future hold?

I appreciate that equipment compatibility issues on farms and at RV parks may require much time and financial capital to resolve. However, I cannot condone sitting idle as lives are lost. I hope a series of discussions during the next code review cycle inspires commissioning an NFPA Fire Protection Research Foundation study to further understand the implications of expanding GFCI protection beyond 15 and 20 amps in RV parks and farms. Let's study the problem, understand the challenges and determine solutions that increase safety.



Let's continue to make great strides in safety

Extending the amp requirement across all receptacles is a milestone that cannot be understated — it will change how industries work. Many of the changes I've discussed represent the first step toward increasing safety, with industry feedback being critically important in making improvements in 2023. With that, we already have some of the data needed to suggest the changes desperately needed in the RV and farming industries. I call on my NEC colleagues to begin safety conversations now so that we as a group can protect more lives from electrical shock.

Article by Thomas Domitrovich, P.E., LEED AP, Eaton vice president, technical sales, May 29, 2019

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See the original full article at: https://www.eaton.com/us/en-us/company/news-insights/for-safetys-sake-blog/NEC-2020-increases-GFCI-protection.html

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Jun
24

IEEE PES ESMO 2019

 IEEE PES ESMO 2019 is coming up, June 24-27 in Columbus, Ohio. The event features two days of technical sessions and an indoor trade show and another two days of outdoor demonstrations. 

The 14th international conference on transmission and distribution construction, operation and live line maintenance offers opportunities to network with your peers and learn about best practices in the utility industry.

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Jun
17

NEMA releases Surge Protection Guide

The first in a new series of publications intended to provide guidance on the evaluation, specification, and use of surge protective devices.
The National Electrical Manufacturers Association (NEMA), Rosslyn, Va., has released the first in a new series of publications intended to provide guidance on the evaluation, specification, and use of surge protective devices (SPD) in low-voltage power distribution system applications.

"Surge Protective Device Specification Guide for Low-Voltage Power Distribution Systems, Part 1" (NEMA SPD 1.1-2019) is written for those who use or specify SPDs and others affiliated with the low-voltage SPD marketplace, "so that uniformity of specifications and parameters will improve comprehension, application, and utilization," said Saad Lambaz, Global Standards Manager at Littelfuse, Inc., NEMA Low Voltage Surge Section Member.

The guide includes SPD ratings related to the operating system and performance, a specification checklist, and information on surge current ratings, modes of protection, and general grounding practices.

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See the original full article at: https://www.ecmweb.com/surge-protection/guide-evaluating-surge-protective-devices

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Jun
03

Top 14 Reasons Electrical Service Installations Get Red Tagged

Whether located inside or outdoors, premises wiring systems powered by an electric utility have what is known as an electrical service. It is the portion of the electrical system from the utility-defined point of connection to the input terminals of the main overcurrent device — although strictly speaking (not included in this definition), the entrance panel is generally considered part of the service.

Because the service components carry a substantial amount of current and their overcurrent protection is much higher (less sensitive) than the ampacities of service conductors and terminals, design and installation are critical. Typically, an electrical inspector will take a good hard look at the service to make sure all is in order prior to signing off on the installation. It's your job to avoid these all too common "red tag" failure points.

This list shows some common missteps electricians, and other non-professional installers, make in electrical service installations across the country. 

1. No Cover on Panelboard

An energized electrical panel should not be operated with the cover removed because: 

  • A complete enclosure is necessary to contain sparks in case of line-to-line or line-to-ground fault. 
  • Exposed energized terminals are a shock hazard. 
  • The cover helps hold the main and branch circuit breakers firmly in place, preventing arcing at the bus bars.


2. Missing or Incomplete Directory on Panelboard

A complete and accurate directory is needed to selectively de-energize branch circuits for maintenance. Entries should not refer to current occupants (e.g., John's Room).


3. Meter Enclosure Out of Plumb

All boxes, including the entrance panel, must be plumb and firmly secured.


4. Missing Knockout Closures

Unused knockouts that have been removed must be fitted with closure blanks (made for the purpose) to ensure integrity of the enclosure.


5. Missing Bonding Connection on Water Pipe

The National Electrical Code (NEC) requires metal water piping to be bonded to the electrical grounding system. This is usually accomplished by connecting to the grounded conductor at the service equipment enclosure. The bonding conductor is sized in accordance with NEC Table 250.66. The points of attachment of the bonding jumper(s) must be accessible.


6. Insufficient Grounding

The NEC requires that a single rod, pipe, or plate electrode be supplemented by an additional electrode if its resistance to earth is greater than 25 ohms. Rather than go through the hassle of measuring ground resistance, many electricians simply drive a second ground rod [as required by NEC Sec. 250.53(A)(2)], and call it a day. In addition, the grounding electrode conductor raceway, which is metallic, should extend below grade and be bonded at the bottom. Most electricians use PVC raceway here to eliminate the need for bonding.


7. Lack of Corrosion Inhibitor with Aluminum Wire


Aluminum conductors are generally used instead of their copper counterparts between the utility point of connection and the main breaker. Including the meter socket, which is usually part of this scenario, there are numerous aluminum terminations. Each one of these requires corrosion inhibitor to ensure that the connection does not oxidize with attendant heat and arcing. Manufacturer's instructions, which are incorporated in the UL listing, state that the metal is to be wire brushed before applying the inhibitor.


8. Main Bonding Jumper is Missing

The main bonding jumper is to be field-installed. It is not to be used if the box is not used as service equipment (i.e., as a downstream load center).


9. Improperly Sized Service

The service size is based on the lighting load plus other loads. Calculation requirements are detailed in NEC Art. 220. Residential and commercial occupancies are figured differently.


10. Service Wire Not Sized Properly

Service conductor sizing is based on the connected load, with different sizes for dwellings and non-dwellings. This is critical because the service conductors are not protected for their ampacity by up-stream overcurrent devices.


11. Telephone or Data Wires Attached to Masthead

A very common Code violation is connection of non-service conductors or other equipment to a masthead. The problem here is that they add to the lateral load on the masthead raceway, especially if there is ice build up or wind load present on the span.


12. Coupling in Masthead Raceway Placed Above the Roof

Because strength of the masthead is critical, there should not be a coupling between the point at which the raceway emerges from the roof and the point of attachment, which is where the lateral loading occurs. Waterpipe should never be used as a masthead.


13. Inadequate Ground Clearance

The point of attachment at the building must be 10 ft above the finished grade and high enough so that the required clearance above grade level is maintained for the entire span. For overhead service conductors over residential property and driveways — and those commercial areas not subject to truck traffic where the voltage does not exceed 300V to ground — this clearance is 12 ft.


14. No Arc Fault Breakers in Panelboard

Just as the ground fault circuit interrupter (GFCI) protects individuals against electric shock, the arc fault circuit interrupter (AFCI) mitigates the hazard of electrical fire. Neither of these life-saving devices is effective if not in place. NEC requires specific locations in dwellings and non-dwellings to be so protected. AFCI protection usually takes the form of specialized circuit breakers installed in the entrance panel. Because of their distinctive appearance with an extra white pigtail that is to be connected to the neutral bar, it is obvious when they are missing.

P3 strives to bring you quality relevant industry related news.

See the original full article at: https://www.ecmweb.com/contractor/top-14-reasons-electrical-service-installations-get-red-tagged

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May
28

Why do I need a personal Uninterruptible Power Supply (UPS)?

With all the bad weather we have had in the area - and it doesn't look like it will lighten up soon - consider the benefits of having a UPS:

Imagine you are working on an important job for your company's most profitable client. Or perhaps you are in college and working on a final term paper. Maybe it is a massive spreadsheet or a multiple page document that you have spent hours working on. Suddenly the power at your office or home goes out! All your hard work has been lost. If only your computer was connected to a UPS, your data may have been saved.

What is a UPS?

In computer terminology, UPS stands for Uninterruptible Power Supply. An Uninterruptible Power Supply is an electrical device, typically with internal batteries, that store power to supply energy to connected devices if normal power is interrupted.

In the event of a power failure, the UPS will instantaneously switch over to its batteries to continue to provide power to connected devices for a period of time to allow the user to save data, shut down properly, or turn on a backup power source such as a generator. The period of time that a UPS will provide power to connected devices ultimately depends on the capacity of its batteries and the load that is connected to it.

Why do I need one?

So why do you need a UPS? Consider it like an insurance policy. People and property have insurance in case something bad or unexpected happens. Most people do not want to get sick, involved in a car accident or worse but in the event that something like this happens insurance policies make us whole again.

Having a UPS is like an insurance policy for your electronics. Power outages are random, brown-outs happen unexpectedly, so why would you not want to protect your PC, server, or even just your big screen TV in your living room at home! It's better to be safe than to be sorry. 

P3 strives to bring you quality relevant industry related news.

See the original full article at: https://sandstormit.com/why-do-i-need-an-uninterruptible-power-supply-ups/

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