Category: Uncategorized (page 1 of 3)

New Circuit Breaker Monitor Released

The company, Dynamic Ratings, has introduced a new Breaker Performance Monitor (BPM) that is a complex circuit breaker designed to monitor utilities. This new equipment has a unique feature that combines offline and online testing with high-speed waveform capture. This feature allows for a complete diagnosis of a breaker’s mechanical and electrical system that can detect operating defects before a breaker failure takes place. Read more about this new product and its performance here.

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What To Know About Measuring and Calculating Voltage Unbalance

It is important to understand what causes and how to fix voltage unbalance when dealing with a 3-phase electrical system. An example used in this article, for instance, shows a 480V nominal system that may measure phase-to-phase voltage: 463V, 482V, and 474V. The voltage unbalance will create a current unbalance or magnify any present current unbalance. According to the National Electrical Manufacturers Association (NEMA), for every 1% of voltage unbalance, 6% to 10% of current unbalance will be created. Voltage unbalances can be caused by several issues in the electric utility system. There is also a simple formula that can be used when taking phase-to-phase voltage measurements. 

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More Details Emerging on Digital Circuit Breakers

Many aspects of the electrical industry are all transitioning to a more digitized world which is now including the digital circuit breakers. Traditional mechanical circuit breakers have been around since the late 19th century when Thomas Edison first came up with the idea. Many homeowners are familiar with their circuit breakers when a fuse is blown and a person has to go looking in the dark for a switch to turn back on but, on a commercial aspect of the situation, it can be very dangerous, since commercial building’s electrical panels are slow enough that it still allows short circuits or arc flashes that can, in bad situations, even kill people. In January of this year, a company called Atom Power was the first to pass a test to bring digital circuit breakers to the market. In this article, the author further explains what makes a digital circuit breaker not only safer to utilize, but also can help eliminate other products that will be no longer needed. There is great potential in this new-found technology and surely Atom will not be the only company to continue research and development on these coming into the future.

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Preventing Transformers from Exploding with Flexible Tanks

Transformer explosions are relatively rare, in fact, only less than one percent will explode. Although this percentage is very small when they do explode it can be very deadly and cause a large interruption with toxic fires or even oil spills. Canadian power supplier has collaborated with comapny ABB on a recent project to design a transformer tank to be more flexible to allow the pressure buildup from inside to expand without causing a rupture or explosion. To read more on how the ABB calculated the measurements and materials needs in order to create this new alternative read this article. This new product will be able to prevent most tanks from explosions thus creating a safer area for people who work near these transformers and also to the environment with less risk of oil spills and fires.

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Electrical Component Shipments Rise in 2019

2019 has seen a somewhat steady growth in the shipments of electrical components, but June was a particularly great month for growth. According to the Illinois Business Daily, shipments of electrical components crossed the 1% growth mark, with a total dollar amount adding up to $11.8 billion in the month of June. The publication points out that the month of May before it saw a growth as well, only at half the amount of 0.5 percent. With technology advancing at an exponential trajectory with no foreseeable reason to stop we can only expect the number of shipments of electrical components and equipment to continue this path. One block in the road this year so far could be the tariffs on Chinese components and equipment coming into the United States, although with negotiations being so vague on that topic one can only speculate on the overall effect of such an installation.

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Being Safe Around Circuit Breakers

Electricity is a dangerous concept and can be deadly if not handled properly. This may seem obvious but plenty of circuit boards these days are equipped with hundreds of amps, which can cause issues if not leveled properly by a current limiter. This is especially important due to the volatile nature of electricity and how often faults can arise.

In the Electronic Design article, the author spends time to explain exactly how these current limiters keep workers safe should any fault occur. You can see pros and cons to these bipolar junction transistors that are used in these limiters and what makes them work to prevent any pending disasters. Using handy charts and data tables the article makes it easy to have a better understanding of the properties so workers in the electric industry can properly work without endangering those around them.

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Questions That Are Important to Ask When Buying Electrical Surplus Inventory Online

When a project is cancelled, warehouses are liquidated, or there are manufacturing overruns an electrical surplus inventory is generated.  Local surplus dealers were once the only sellers of electrical surplus inventory.  Today however, surplus equipment can be purchased through e-commerce platforms.  It is important you should proceed with caution when you come across surplus electrical component’s suppliers online; research and asking the right questions when buying online is crucial.  Below you will see how you should proceed when buying electrical surplus online.

Asking the right questions when buying surplus electrical equipment online helps you make the right purchase.  These questions should include:

  • Is the equipment a product that is from the original factory?
  • Will the new surplus inventory come in a sealed box?
  • Are there any visible structural damage like fractures or cracks in the equipment?
  • Do the products being sold contain any proof of safety and reliability?
  • Are there any signs of the equipment being burned in any way?
  • Has the equipment been in use, when?
  • Has the product failed?  What were the circumstances of the failure?
  • Do the products come with a warranty? When does the warranty expire?
  • Does the equipment have a period in which it can be returned if it does not meet the required standards?

Essentials to Consider When Purchasing Surplus Electrical Equipment

Voltage Ratings Input/Output

Know the voltage rating of the surplus electrical product as well as the voltage rating of your power sources.  This will determine if the equipment is suitable for your application.  Incorrect voltage ratings risk short circuiting, arching, and electrical fires.

Continuous Current Rating

The continuous current rating will allow you to know if the device will be able to perform properly in varying environments.  This is listed as Amperes.  They represent the continuous current that can be carried when used in the temperatures it is calibrated for.

Current Rating, Short-Circuit

Short-circuit current rating, SCCR, is a current rating that defines the maximum short-circuit current the product can safely handle.  Individual SCCR components for the electrical assembly are calculated to determine the SSCR for the entire electrical panel.

Electrical Current Frequency

Pay attention to the current frequency at which equipment or breakers are designed to operate properly.  The electrical current frequency determines the highest current a device can handle operating at without issue.

Don’t compromise the quality of surplus equipment by purchasing from a less than a reputable electrical component supplier.  At J & P Electrical, we assure quality and competitive pricing.  Contact us today to discuss your needs. 

J & P Electrical Company is a full-service electrical company that supplies contractors, end users, and supply houses with new surplus, quality reconditioned, and obsolete electrical equipment. We offer a wide range of electrical equipment such as bus plugsbus ductspanel switches, and transformers. Services include asset managementproduct reconditioning, and electrical products. More information can be found at

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Testing Relay Switches

When working with any type of electrical component, safety is a key element.  There are regulations in place by the North American Electric Reliability Corporation, NERC, that require components within transformer stations that are tested every six years.  In this installment from Utility Products, “Relay Test Switches” you can get an overview on safely testing relay switches and other electrical components.

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Installing Bus Ducts Properly

Bust ducts, known also as busways, are created from a sheet of metal with the busbar being made of copper or aluminum. Bus ducts conduct electrical currents, that is their main purpose when used in manufacturing.  Many companies manufacture bus ducts, with the most popular supplier being Square D.  Not only does Square D manufacture bus ducts, they supply a wide range of bus plugs, electrical switches, circuit breakers, and more.  Proper installation and assembly of a bus duct will save you money and prevent costly downtime. 

Proper Bus Duct Installation

In order to ensure your electrical system functions properly your bus ducts must be installed correctly.  Bus ducts are used to provide power throughout an electrical system so if there is an issue with the bus duct it can result in costly delays and downtime.  In order to avoid this, proper installation is required.

The Importance of Ampacity

The amount of electrical current that a device can withstand without being damaged is known as ampacity.  A bus ducts ampacity rating is determined by using the temperature within the operating space and referencing a standard chart for temperature assumptions.  Once the operating temperature has been determined users must consider the rise in temperature between a zero current and a full load current.  As an example, a common bus duct with copper inside often has a current rating of 2,000 amps per square inch.  The rating results in the voltage dropping as the temperature increases.

Additional Protection

Like with any installation especially electrical, location is a key aspect that needs to be considered.  For most facilities bus duct installation is downstream from transformers and upstream from the primary overcurrent device.  Whatever devices is being used to protect the transformer cannot be used to protect the bus duct from electrical fault.

Extra protection to the bus ducts is another way to decrease any potential downtime from occurring.  When downtime occurs, facilities end up paying for workers to stand around.  Adding an extra layer of protection to your bus duct will give you extra peace of mind as you will know your bus duct will properly function.   

Bus ducts that are installed outdoors should include protection from the elements.  Choose a shelter that allows water to drain vs sitting in a pool overhead.  Extra water allowed to collect can cause a short in the bus duct.  Humidity can also be an issue when bus ducts are utilized outside.  This can be prevented by using stainless steel as it inhibits corrosion.  An epoxy primer of paint can be added to the housing to prevent the oxidation of the metal.

Bus ducts can also be installed on an outside wall.  When this is the case proper flame-retardant wall fittings that are waterproof and vapor-resistant should also be used as a precaution.  Extra supports for the ducts where they enter the wall should be in place to hold the extra weight. 

The installation of bus ducts is important.  Correct installation allows a system to function properly without downtime.  Protection helps to prevent corrosion and protects from outside elements.  And using proper metals and assembly kits from the manufacturer help to ensure you are using the right materials for your bus duct assembly.

J & P Electrical Company is a full-service electricalcompany that supplies contractors, end users, and supply houses with new surplus, quality reconditioned, and obsolete electrical equipment. We offer a wide range of electrical equipment such as bus plugsbus ductspanelswitches, and transformers. Services include asset managementproduct reconditioning, and electrical products. More information can be found at

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Introducing World’s First Digital Circuit Breaker

Technology continues to change the world that we all live in and that doesn’t stop when talking about the electrical world as well. The world’s first and only digital circuit breaker certified for commercial use has been introduced by the company Atom Power. This new breakthrough will not only make power easier to manage but also 3000 times faster compared the fastest mechanical breaker. Atom Power continues research to accomplish more successes in the field and is ready to take on more challenges with investments from three of the four largest circuit breaker manufacturers, Siemens, ABB, and Eaton to shape the future of electrical power. To understand how this new digital circuit breaker fully works, check out the article “How the World’s First Digital Circuit Breaker Could Completely Change Our Powered World”.

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