As the world celebrates Earth Day, all industries are finding ways to conserve resources and help the environment. For electricians, this means finding ways to offer high-quality equipment without adding to the dangerous emissions created by the parts manufacturing process. By finding high-quality refurbished equipment, electricians can benefit both the environment and their customers’ budgets.

Refurbished and Used Equipment

As many electricians realize, electrical equipment and components are available that yield the same high performance as their brand new counterparts. Often these parts are removed from buildings or are left over from large projects. Supply companies purchase them after ensuring they’re still in good working condition. Once purchased, they’re refurbished to ensure every working part gives peak performance.

Electricians aren’t required to purchase parts for a large-scale operation to put refurbished parts to work for their clients. Many professionals choose to simply begin ordering from a refurbished parts supplier with one or two parts, then graduate to placing regular orders. With each order, electricians are avoiding the manufacture of new parts, helping reduce the number of carbon emissions harming the environment.

Electronic Waste

In general, electronic waste poses a serious threat to the environment, with disposal of electronic equipment and parts creating dangerous emissions. The government has attempted to reduce the amount of e-waste disposal, especially at the consumer level, but the problems are still ongoing. The biggest risk is to human health, since disposal of electrical equipment can often release harmful chemicals into the air.

The best way to safeguard the health of citizens, as well as the overall air quality, is to keep electrical parts in circulation as long as possible. In many cases, even defunct equipment can be disassembled and some of its parts refurbished. Those parts can then be either put in other equipment or used by electricians as they perform installations.

Keeping Landfills Safe

EMSCO helps keep electrical equipment and components out of landfills and recycling centers, removing governments from the burden of finding ways to safely dispose of them. The company offers to purchase equipment and parts from businesses that have excess inventory or from sites that are being demolished or vacated. EMSCO is always in need of items of various types in order to meet the demands of its many clients.

Additionally, EMSCO allows engineers and other professionals to simply place a phone call and locate the refurbished part they need. Many technicians make the refurbished supplier the first call they make when they need a part, only buying new when a used or refurbished version isn’t available. This reduces the amount of parts being sold each day, eliminating the need for those parts to be replaced by more new parts.

When companies have excess parts, they also can contact EMSCO to purchase them. Selling them to EMSCO can be a great way to recoup some of their cost on a major office move. EMSCO makes the process of offering equipment easy, allowing businesses to email a list of all parts along with pictures, if possible, and they’ll soon be provided a quote that they can accept or reject.

Have surplus industrial electrical equipment you want to sell? Click here to contact our buyers!

In any industrial or commercial setting, ensuring the safety of personnel and equipment is paramount. One critical aspect of electrical safety is the proper implementation of safety switches and disconnects. These devices play a crucial role in protecting against electrical hazards, preventing accidents, and facilitating maintenance work on electrical systems and machinery. In this blog post, we'll delve into the basics of safety switches and disconnects, exploring their functions, types, and importance in maintaining a safe working environment.

Understanding Safety Switches and Disconnects

Safety switches, also known as disconnect switches or isolators, are devices designed to quickly and safely disconnect electrical power to a circuit or piece of equipment. They serve as a means of isolating electrical circuits, machinery, or appliances to prevent electric shock, fire, or damage to equipment during maintenance, repair, or emergency situations.

Functions of Safety Switches and Disconnects

Isolation: Safety switches provide a physical break in the electrical circuit, ensuring that no power is supplied to the connected equipment or circuit when in the off position. This isolation is essential for preventing accidental contact with live electrical components.

Emergency Shutdown: In case of electrical faults or emergencies, safety switches offer a quick and reliable means of shutting off power to affected circuits or equipment, minimizing the risk of further damage or injury.

Lockout/Tagout (LOTO): Safety switches are often used in conjunction with lockout/tagout procedures to ensure that equipment remains de-energized during maintenance or servicing, preventing unauthorized activation and safeguarding personnel working on the equipment.

Types of Safety Switches and Disconnects

Fused Disconnect Switches: These devices incorporate fuses into the disconnect switch mechanism, providing overcurrent protection when excessive current flows along with the ability to disconnect power, preventing damage to equipment and minimizing safety risks.

Non-Fused Disconnect Switches: Non-fused disconnect switches offer a means of isolating power without the inclusion of fuses. They are commonly used in applications where overcurrent protection is provided elsewhere in the circuit.

Circuit Breaker Disconnects: Circuit breaker disconnects combine the functions of a disconnect switch and a circuit breaker, allowing for both disconnection and overcurrent protection.

Importance of Safety Switches and Disconnects

Electrical Safety: By providing a means of isolating power, safety switches and disconnects help prevent electric shock and electrocution hazards, safeguarding personnel working on electrical systems.

Equipment Protection: Disconnecting power during maintenance or repair activities helps prevent damage to equipment and extends its operational lifespan.

Fire Prevention: Properly functioning safety switches can mitigate the risk of electrical fires by quickly disconnecting power in the event of a fault or overload.

Compliance with Regulations: Many regulatory standards and codes mandate the use of safety switches and disconnects in industrial and commercial settings to ensure compliance with safety requirements and prevent accidents

Key Considerations When Choosing Safety Switches

Voltage and Amperage Rating: Select safety switches that match the voltage and amperage requirements of the electrical system they will be protecting.

Enclosure Type: Consider the environmental conditions (e.g., indoor, outdoor, hazardous locations) when choosing the appropriate enclosure type for the safety switch and select the appropriate NEMA rating for the disconnect switch.

Fused or Non-Fused: Ensure that you select the correct type for the applications of your electrical system.

Conclusion

Safety switches and disconnects are indispensable components in electrical systems, serving to protect both personnel and equipment from electrical hazards. Understanding their purpose, types, and key considerations is essential for ensuring a safe and compliant electrical environment. By prioritizing safety and selecting the right safety switches for your application, you can mitigate risks and create a secure work environment. Remember, when it comes to electrical safety, there's no room for compromise.

Shop the largest selection of used and reconditioned safety switches

Browse our selection of Low and Medium Voltage Switchgear

You're probably aware that EMSCO is a top provider of used, reconditioned, and surplus industrial electrical equipment. However, you might not know that beyond just being the largest supplier, we also can tailor our products to your exact needs. Let's discuss one aspect of this customization: trip units, specifically the AC Pro and AC Pro II trip units.

Before and after refurbishment, ready for shipment to our customer in Kentucky.

Square D I-Line Distribution Lineup:
🔹 2000A Main Breaker Section (LSIG)
🔹 1200A Distribution Breaker Section (LSI)
🔹 Surgelogic Surge Protective Device

Distribution Section:
🔹 2 x 400A Breakers
🔹 10 x 200A Breakers
🔹 1 x 60A Breaker

All used circuit breakers are load-tested with test reports.

One of the most common challenges in our industry is accurately distinguishing between the different series of vintage Westinghouse/Cutler-Hammer busway systems. Despite their nearly identical appearances, the TAP, ITAP, and ZTAP series are entirely distinct and cannot be interchanged.

Fortunately, there are quick and straightforward methods for correctly identifying the specific vintage series you require. In the following discussion, we will explore these differences, highlighting easy-to-spot clues on the plugs to help you correctly identify the type you need.

 
Identifying the types:

TAP

In any industrial power distribution system, safety and reliability are of paramount importance. To protect electrical circuits and equipment from potential hazards such as overcurrents and short circuits, engineers and electricians often employ protective devices like fuses and circuit breakers. These devices play a crucial role in safeguarding the entire system, but they differ in design, operation, and response to electrical faults. In this blog post, we will explore the key differences between fuses and circuit breakers in industrial power distribution.

1. Function and Operation:

   • Fuses: A fuse is a one-time, non-resettable protective device that contains a metal strip or wire designed to melt when exposed to excessive current flow. When the current exceeds the fuse's rated value, the metal inside the fuse will melt, opening the circuit and stopping the current flow. Fuses are inexpensive and simple in design, making them suitable for basic protection.
   • Circuit Breakers: Circuit breakers, on the other hand, are resettable protective devices designed to interrupt the current flow upon detecting an overcurrent or short circuit. They consist of an electromechanical switch that opens the circuit when an abnormal condition occurs. After tripping, circuit breakers can be manually or automatically reset, restoring power to the circuit once the fault is resolved.

2. Response Time:

   • Fuses: Fuses generally have a faster response time compared to circuit breakers. When subjected to overcurrent conditions, fuses blow quickly, thereby interrupting the current flow almost instantaneously. This swift response is essential in protecting sensitive equipment from damage due to high currents.
   • Circuit Breakers: Circuit breakers may have a slightly slower response time compared to fuses. The tripping mechanism needs a brief moment to detect the fault and open the circuit. While the delay is minimal, it can be a critical factor when dealing with highly sensitive electronic devices.

3. Protection Accuracy:

   • Fuses: Fuses provide good protection against overcurrent conditions, but their accuracy depends on the type and rating of the fuse. They might not always respond precisely to minor overloads or fluctuating currents, which can lead to undesired nuisance trips or insufficient protection in some cases.
   • Circuit Breakers: Circuit breakers offer more precise protection since they can be equipped with various types of trip units that allow customization of the tripping characteristics. This adaptability ensures that circuit breakers respond accurately to specific overcurrent levels, providing better protection for critical equipment.

4. Maintenance and Resetting:

   • Fuses: Once a fuse blows due to a fault, it must be replaced manually. This process can be time-consuming, especially in large industrial setups with numerous fuses. Additionally, identifying the faulty fuse might require careful inspection, further adding to the downtime.
   • Circuit Breakers: Circuit breakers have the advantage of being resettable, which significantly reduces downtime in the event of a fault. After isolating the faulty circuit, the breaker can be reset with a simple switch, restoring power to the system almost immediately.

5. Cost and Longevity:

   • Fuses: Fuses are generally more cost-effective than circuit breakers, making them a popular choice for lower current applications. However, their one-time use means they must be replaced after each fault, resulting in higher long-term maintenance costs.
   • Circuit Breakers: While circuit breakers may have a higher initial cost, their reusability and longer lifespan offset this drawback. They are an economically viable option for higher current applications and provide better value in the long run.

In conclusion, both fuses and circuit breakers play critical roles in safeguarding industrial power distribution systems. Fuses offer fast response times and cost-effectiveness, while circuit breakers provide more precise protection and are easier to maintain. The choice between these protective devices ultimately depends on the specific requirements of the industrial application and the level of protection needed for the equipment and personnel involved.

The safety of any transformer or other electrical device should always come first. Low Voltage and Medium Voltage Encapsulated Dry Resin Transformers testing is required for safe operation. We can find any potential problems or weaknesses in the insulation of dry resin-filled transformers by performing routine testing. These tests allow us to take preventive action for your secure working environment.

Encapsulated Dry Transformer Components for Safety and the Environment

Electrical transformers that don't need a liquid coolant like oil are known as dry transformers. You may know them as resin-filled transformers, cast resin transformers or solid insulated transformers.

They use air for insulation and cooling. Dry transformers are popular because of their safety, effectiveness, and environmental friendliness in commercial and industrial environments. They are used in manufacturing facilities, renewable energy production, power distribution systems, and other areas.

Dry transformers are made up of a number of essential parts. The primary components consist of a laminated steel core that minimizes energy losses and a copper or aluminum conductor coil. Paper, fiberglass, or epoxy resin are used to insulate these windings, ensuring both electrical insulation and protection from impurities and moisture. For safety and cooling, the transformer is housed in a solid, vented casing.

Let's take a look at Megger test equipment for dry transformers and looking at the test results.

Megger Test Equipment Finds Insulation Weakness, Moisture, Safety Hazards

What is a megger test? Megger test equipment is effective for identifying moisture, insufficient insulation, and other possible problems in transformers. The test procedure includes applying DC voltage to the transformer windings during the test. The Megger test assists in locating any deterioration or breakdown in the insulation material by evaluating insulation resistance.

When looking at your megger test report, keep in mind the resistance reading will be lower than expected if the insulation is damaged, suggesting potential defects or moisture infiltration. With the help of this test, insulation issues like cracks, contaminants, or age can be found that could otherwise result in electrical problems, short circuits, or even catastrophic failures. Early detection of these problems allow necessary repairs or maintenance to be carried out, ensuring peak performance and averting safety risks. If you’re looking to invest in megger test set, check out the Megger Trax 220 Test Set for insulation resistance, winding resistance, turns ratio, dissipation factor, and more.

Transformer Megger Test Step-by-Step Procedures

Safety First:  Make sure the transformer is totally de-energized and you’re wearing appropriate personal protective equipment (PPE).

Setting up the Megger:  Prepare your Megger test device according to manufacturer directions. Verify that it’s calibrated and in good working order.

Disconnect Power:  To prevent incidents from occurring, make sure the transformer's power supply is completely cut off.

Clean your Transformers:  Clean the transformer's terminals and insulating surfaces. Any debris, moisture, or dirt that could compromise the test's accuracy should be removed.

Connect the Leads:  It’s recommended to connect the lead with the higher voltage (often red) to the high-voltage side and the lead with the lower voltage (typically black) to the low-voltage side.

Set Megger Test Duration:  The typical time frame is one minute, but it's always a good idea to check the manufacturer's instructions for any particular specifications.

Launch the Test:  Turn on the testing device. The transformer windings will receive a high-voltage DC voltage, and the instrument will measure the insulating resistance.

Interpret Megger Test Results: Compare insulation resistance with the reference value or the range the OEM specifies.

Based on test results, no urgent intervention may be needed if the insulating resistance is within the manufacturer’s stated range. Do repairs or arrange for maintenance if the reading falls below the designated threshold.

Looking for a Medium Voltage Dry-Type Transformer Testing Service?

This test helps you identify risks and prevent electrical faults or failures by identifying insulation weaknesses, moisture and other potential problems. The Megger test offers useful information about the insulation integrity of the transformer when you’re doing maintenance and repairs to maintain performance and avoid safety risks. Regular Megger testing extends the life and dependability of transformers in a safe environment. Make megger testing a routine and seek professional services if you’re not qualified to use the testing equipment.

Looking for a Medium or Low Voltage transformer or having one tested? A Megger Testing Service for transformers using test equipment like the Megger Trax 220 Test Set is crucial for verifying the effectiveness and safety of transformers.

Contact EMSCO customer service to arrange testing. Ask about EMSCO testing services for dry-type medium voltage transformers. Our new Megger Trax 220 Test Set allows us to perform a wide range of tests, including insulation resistance, winding resistance, turns ratio, dissipation factor, and many others.

In the realm of industrial power distribution, ensuring safety, reliability, and efficiency is of utmost importance. To protect electrical circuits and equipment from overcurrents and short circuits, engineers often turn to molded case circuit breakers (MCCBs). These robust and versatile devices play a crucial role in safeguarding industrial power systems, ensuring smooth operations and preventing potential hazards. In this blog post, we will delve into the features, benefits, and applications of molded case circuit breakers in industrial settings.

The Anatomy of Molded Case Circuit Breakers:
Molded case circuit breakers are named after their housing, which is typically made from molded insulating materials such as plastic or fiberglass. Inside the casing, these breakers comprise essential components like the trip unit, operating mechanism, and current-carrying contacts. The trip unit is responsible for detecting overcurrent conditions and tripping the breaker when necessary, while the operating mechanism ensures the mechanical action of opening and closing the circuit.

Wide Range of Current Ratings:
MCCBs are available in a wide range of current ratings, making them suitable for diverse industrial applications. They can handle currents ranging from a few amps to thousands of amps, allowing engineers to choose the appropriate breaker based on the specific requirements of their power distribution system.

Accurate and Reliable Protection:
One of the primary functions of an MCCB is to provide precise and reliable protection against overcurrent conditions. The trip units in MCCBs are designed to respond swiftly to abnormal current levels, effectively isolating the faulty circuit and preventing potential damage to equipment. With adjustable tripping settings, engineers can customize the MCCBs to suit the unique characteristics of their industrial power systems.

Thermal and Magnetic Protection:
MCCBs offer both thermal and magnetic protection, catering to different types of faults. The thermal trip element responds to overloads caused by long-duration, low-level overcurrents, while the magnetic trip element reacts to short-circuit currents. This dual protection mechanism ensures comprehensive safety coverage in industrial power settings.

Selectivity and Coordination: 
Industrial power distribution systems often have multiple levels of circuit breakers, from the main distribution board down to individual branch circuits. MCCBs provide the advantage of selectivity and coordination, which means that when a fault occurs, only the nearest MCCB to the fault will trip, leaving other downstream breakers unaffected. This feature minimizes downtime and optimizes system performance during fault scenarios.

Ease of Maintenance and Retrofitting:
MCCBs are designed for easy maintenance and replacement. With proper periodic inspection and testing, their lifespan can be extended, contributing to cost savings. Additionally, they are compatible with various accessories and digital communication modules, enabling seamless integration into modern industrial automation systems.

Versatility and Applications:
Molded case circuit breakers find applications across various industrial sectors, including manufacturing plants, data centers, commercial buildings, oil and gas facilities, and mining operations. They provide vital protection for motors, transformers, generators, distribution boards, and other critical electrical components.

In conclusion, molded case circuit breakers are indispensable assets in industrial power settings. Their accurate protection, ease of maintenance, and compatibility with modern automation technologies make them a reliable choice for ensuring the safety and efficiency of power distribution systems. By understanding the benefits and applications of MCCBs, engineers can make informed decisions to secure their industrial power infrastructure effectively.

Find the Molded Case Breaker you need here!