Our Services

Acceptance and Maintenance Testing


Transformers are a fundamental part of any electrical system. Transformers allow us to generate, distribute, and utilize power at many different voltages. Power is typically generated at low to medium voltages. It is then transformed utilizing a generator step up transformer (GSU) to a much higher transmission voltage. This transmission voltage allows the power to be sent over greater distances with lower losses than if the generation voltage had been used. At the utility delivery point power is again transformed to a distribution voltage using a power transformer and distributed to the end user at the user site. From there, the voltage is typically transformed to the voltage requirement of the client. This transformer may be a pole, padmount, dry, cast coil, or unit substation. Even in the simplest scenario transformers are found throughout electrical power systems, so it is important to understand how to commission, trend, and maintain transformers in order to reduce hazard to life and property.

Acceptance testing and commissioning of new or recently moved transformers is a critical step in managing electrical power systems. There are many factors that can go wrong in the transport and installation of a transformer, all of which can be detected through thorough acceptance testing and commissioning. AMP abides by the NETA/ANSI 2009 ATS Standard for acceptance testing specifications. We also abide by the Institute of Electrical and Electronics Engineers (IEEE), National Fire Protection Agency’s NFPA 70B standards, and the International Electrotechnical Commission’s standards.

Circuit Breakers

Circuit breakers offer a better alternative to fuses and switches. Switches open and close circuits and can even be equipped to operate remotely, but do not provide overcurrent protection. Fuses provide overcurrent protection. The combination of a switch and a fuse can give open and close capabilities, but still lacks the ability to reset and continue to provide power and protection. Circuit breakers provide a means with which to turn on and off the power in an electrical system while providing overcurrent protection. What sets circuit breakers apart from switches and fuses is that they have the ability to be reset and controlled remotely and have logic functions as part of their operation. These features make circuit breakers great candidates for anywhere in your system that may see frequent faults, where the need for immediate power restoration is important, or where logical input is desired for different states of the power. Circuit breakers range in complexity from a simple thermo-magnetic trip functions to microprocessor-controlled protective devices with practically infinite adjustability and configurability.

Low voltage circuit breakers typically are designed and installed together from the factory; their protective trip devices are built into the frame or chassis of the breaker. medium- and high-voltage circuit breakers are dependent on external or cabinet-mounted protective relays to instigate their trips. These devices can be specified as part of the breaker from the factory or part of a much larger substation protective scheme that includes differential and distance feeder protection.


Stand-by Generators

Standby generators are necessary wherever there are critical systems relying on a constant supply of electricity. As these generators are an important power source in a temporary outage or emergency, regular maintenance is essential, and it is important to have a trustworthy contractor who can maintain, repair, and offer advice on the different types of generators.

Our knowledgeable technicians are skilled in the repair and maintenance of these versatile machines, as well as being able to set them up to the required systems and advise their owners on their operation and upkeep. Equally important to an emergency power system is the transfer means. Whether it is paralleling gear, peak shaving controls, or synchronization relays, our technicians can maintain and test your equipment to ensure it will be available and operate when it should and as it should.


Generators have one thing in common: they all rely on some means of mechanical power to convert into electrical energy that can be used by your electrical system. Routine maintenance on this prime mover is critical for the proper operation of a generator system to provide power reliably.


This is the device that actually outputs electrical power to your system when spun by the prime mover. Generators have winding similar to those of an electric motor and are treated from an electrical maintenance standpoint as you would treat your critical electrical motors. Resistance measurements should be taken across bolted connections, and insulation resistance tests should be performed in accordance with ANSI/IEEE Standard 43.


Transfer switches change the electrical path from normal utility power to emergency generator power. It is easy to see how important this device would be during an emergency. The ANSI/NETA MTS-2011 Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems recommends visual and mechanical inspections as well electrical tests. The electrical tests should be, at minimum: contact resistance across each switchblade assembly; insulation resistance tests for one minute on each pole, phase-to-phase and phase-to-ground with the switch closed and across each open pole; and dielectric withstand test.

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304 Turney Ridge Rd
Somerville, AL 35670

41 Peabody Street
Nashville, TN 37210