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EP Technology Surge Protection Device and Waveform Correction Devices

EP technology is a patented power quality solution for today’s digital age. With the combination of Waveform Correction and Surge Protection Device, Environmental Potentials’ product line offers complete protection and performance to your facility. EP technology absorbs, attenuates, and dissipates harmful electrical noise into its tank circuit, correcting the waveform back to its sinusoidal nature. Please read here for more about our technology.  

Traditional SPDs rely on the principle of “dumping energy into the ground”, using a box of MOV (Metal Oxide Varistor). MOV’s activate in the event of overvoltage and immediately pass the high-intensity surge energy from the power line to the ground. However, the surge diversion results in a severe problem of “ringing noise” in the system. The ringing noise, aka switching noise, is higher order harmonics in the range of 3-100kHz.  

In addition, we do not live in a world with perfect “insulated ground” anymore. Diverting energy into the ground alone is not a solution anymore.  

EP technology is the combination of TMOV based surge suppression and patented waveform correction circuit. The self-healing Thermal MOV with the help of the tank circuit captures the surges and transients under one nanosecond. The captured energy is safely dissipated both in the TMOV and the tank circuit in the form of heat. The resultant ringing noise from the surge suppression is pulled into the low pass filter circuit, ultimately attenuating the noise; therefore, the  downstream of the EP is noise-free. Read EP technology to understand more. 

The optimum installation of EP units in a facility will result in  

1. Protection: Increased protection from Surges, transients, switching noise, higher-order frequency noise 

2. Performance: Increased systems performance after the noise removal 

3. Maintenance: Decreased maintenance of the system by removing the causes of erratic behavior and malfunction. Energy loss reduction with an increased life of the system. 

Every electrical facility under 600v at their main panel can use EP technology. With industrial, commercial, communication, and residential applications, Environmental Potentials has a solution for businesses, governments, and homes of all shapes and sizes.  

EP technology meets UL 1449 4th Edition Type 1 & Type 2 SPD, CSA std. c22.2 No. 8-2013 Ed 5, NEMA LS-1, NEC Surge Suppression Standards, UL 96 A 

General QuestionsSurge Protection Device and Waveform Correction Devices

Surge and transients are used in the industry interchangeably. Both are high voltage (110% above the rated voltage) and high current short duration high energy pulses that can cause damage to the sensitive electrical and electronic loads. Surges enter the facility from the outside, such as lighting strikes. In contrast, the transients are generated internally through capacitive switching, starting/stopping loads, fault/arc initiation, power system recovery, etc. 

Switching noise, higher-order harmonics (3-100kHz) is the transient energy generated at the time of load switching. Today’s electronics constantly switch from AC to DC, DC to AC frequently for its operation. During the switching process, the electronics generate an unwanted electrical signal called “switching noise.” The switching noise is often referred to as high-frequency noise or higher-order harmonics throughout the EP literature. 

The three terms mean similarly referring to electrical noise in the range of 3-100kHz

High-frequency noise, 3-100kHz, is the electrical noise resulting from switching transients. The negative consequences of higher-order harmonics are: 

1. They cause premature damage to the equipment 

2. Malfunction and erratic behavior of the electronic equipment 

3. Electrical resonance phenomenon in the power system 


No, the damage may not be instantaneous to the distribution system. The noise constantly alters the capacitive reactance of the load, resulting in erratic behavior, premature damage to the load. 

The surges and transients may cause instantaneous damage to the electrical loads in fire, arc, or permanent damage to the system. The internally generated transients might not damage the load instantly but will affect the performance of the system. 

70-85% of the total transients in a facility are generated internally. The sources of the internally generated transients are: 

1. Load switching 

2. Non-linear load behavior such and VFDs, and PLC 

3. AC-DC power conversion 

4. Starting and stopping loads 

5. Arcing faults (ground) 

6. Discharge of inductive loads such as transformers, motors 

7. Contactors, relays, and circuit breaker operation. 

The rest 15-30% transients are generated outside the facility in high energy surges. The sources of externally generated surges are: 

1. Lightning – both direct and indirect hits 

2. Utility initiated grid and capacitor switching 


No, the traditional SPD installed at the main panel will remove the externally generated noises entering the building. 

EP technology:

1. Uses Thermal based Metal Oxide Varistor for its surge protection device circuitry, complying with UL 1449 3rd Ed to remove externally generated surges and transients.

2. Uses waveform correction and low pass filter circuits to continuously remove the switching noise / higher-order harmonics generating internal to the facility.

Circuit breakers are current-based devices that respond in 5-20 milliseconds. Circuit breakers cannot stop the voltage surge or transients that are usually in microseconds. The SPD in the EP technology is the only device that can protect your facility from surges. 

Yes, the UPS are a great device when power interruptions are expected at the load, but they do not protect your loads from noise and transients. UPS may have inbuilt surge protection but not significant enough to handle the transients generated at the main panel. The facility still needs large kA rated SPD at the main panel and the load center 

Transients and surges may not damage your loads immediately. The transients hitting the electronics loads constantly alter the capacitive nature of the load, resulting in a slow death. The longevity of the load significantly diminishes over a period. The worst part is – the load tends to generate heavy inrush/discharge current before it dies, resulting in damage to other electrical loads in a facility. Ex: Your outdated furnace will take some other electrical loads along with it when it breaks. The facility must need EP units that constantly absorb the noise and filter them out, so the life of your equipment is extended without causing maintenance issues. 

Significant. The lead length of the EP units must be as – short – as possible for effective surge and noise filtration. For every one inch of the wire, an additional 20-25V of let-through voltage is added. The surge and transients are high-frequency noise that has a higher impedance when the wire length is increased. All EP units’ VPR numbers are taken at a 6-inch lead length. 

Not often, the EP filters are robust enough to withstand harsh electrical environments. The LED indicators on the EP units show the active phase. The units need to be immediately replaced if any of the LEDs are off. The units may fail when they are subjected to continuous high surge events. Some of our EP filters are still running well after 20 years of installation. 

No, they do not need maintenance. Clean the surrounds and make sure the LEDs are visible to the operations/facility professionals. 

Yes, EP makes surge protection and noise filters for DC applications. Contact us at info@ep2000.com to find out the unit model number. 

Installation Questions Surge Protection Device and Waveform Correction Devices

The selection of proper EP units depends on various parameters, such as the voltage configuration and panel amperage. Our application guide can help you through in choosing the proper EP unit for your application. Contact us at info@ep2000.com for better assistance. 

Yes, EP units will protect your facility if the surge is passing through the main panel. However, surges can enter the facility in many ways, such as ground, powerline, communication cables etc. The surge takes the least path of resistance to the load. If the origin or source of the surge is not passing through the main panel, the EP unit at the main panel may not protect your entire facility effectively. For this reason, individual EP units at the subpanel or the load centers are recommended, such as EP power supplies. 

Maybe. The EP units are designed to remove the electrical noise in the system. Electrical noise is often wasted energy. Removing the noise may result in saving energy consumption of the facility. However, EP will not make any claims on the amount of energy savings that can be achieved in a facility. 

Depending on the applications, the EP units come in many sizes. The smallest OEM fits in a T5/T8 lighting fixture, and the largest EP2888 series (24 x 24 x 12 in) can be conveniently mounted at the main panel. 

We recommend installing a larger EP unit in the main panel and a smaller EP unit at the subpanel to protect both panels. 

The EP2800 series comes with a 10-year standard warranty, and the rest of the EP units come with a 5-year warranty. Please read our return policy here. 

The installation has to be performed by a certified and licensed electrician. Please read the installation manuals before installing the product. 

Single-phase is 2 Line, neutral and ground. Ex: US residential panel with 120/240v. Single leg is One Line, neutral and ground. Ex: Asian residential panel with 240V L-L. 

Read our installation manual carefully before approaching installation. If you have urgent queries, you can contact us at 844-500-7436 for questions. 

The warranty form has to be submitted within the first 30 days of the purchase. The warranty form is available online for your convenience. 

The visible LEDs indicate the active phase of the EP units. 

Depending on the noise levels in the system, the EP units can get as hot as 140F (60C) on the surface. 

Yes, the EP units can be side, bottom, or top-mounted to the cabinet. 

Check with your local electrical codes to install power quality equipment inside the panel. EP units are installed inside the panel in various countries. 

Yes, with the help of external casing. The EP units are not water-proof and require to be inside a NEMA-rated casings if they are installed outside the building.