What Is Electromagnetic Integrity Engineering™?

by James Finn

Over the past two weeks, Elexana has received 70+ interview requests from electrical engineers seeking employment. Of the top candidates we’ve interviewed, there is one consistent observation: how little physics these applicants know, and how little experience they have working with typical tools we use at Elexana, such as oscilloscopes, power analyzers, spectrum analyzers, sensors, probes, and various meters. The other observation is that the work we do as a company has evolved into a seemingly new field of electrical engineering that might only be touched upon in the occasional footnotes of their textbooks.

Reliable electrical and electronic systems depend on more than the performance of their individual components. They also depend on the electromagnetic conditions in which those components operate, the way equipment is interconnected, and the paths through which energy moves within and between systems. A well-designed device can experience interference when installed in an unsuitable environment. Equipment that performs correctly on its own can behave differently when connected to shared power, communications, grounding, or control infrastructure.

Electromagnetic Integrity Engineering™ is the engineering discipline focused on ensuring the reliable operation of electrical and electronic systems through the evaluation, design, measurement, and control of electromagnetic phenomena. At Elexana, this term describes an integrated approach that encompasses electromagnetic interference, electrostatic discharge, power quality, grounding, bonding, shielding, attenuation, containment, and thoughtful electromagnetic compatibility design. It also considers the environmental and installation conditions that influence how these systems perform.

The central concern is whether a system can perform its intended function reliably within its actual electromagnetic environment.

Electrical equipment both produces and responds to electromagnetic energy. Switching power supplies, motor drives, communications transmitters, and other sources can introduce disturbances through conductors or surrounding fields. Those disturbances may affect nearby equipment, travel through shared infrastructure, or couple into sensitive circuits. Their effects depend on frequency, magnitude, duration, physical arrangement, and the susceptibility of the receiving system.

Interference can appear as an obvious failure, but it can also produce less visible problems. Measurement drift, intermittent communication errors, unexpected control behavior, corrupted signals, and unexplained equipment resets may all warrant an electromagnetic investigation. Such symptoms are not, by themselves, proof of an electromagnetic cause. Engineering judgment and controlled testing are needed to distinguish interference from software defects, mechanical problems, component failures, and other possible explanations.

An effective investigation examines the relationship among the disturbance source, the coupling path, and the affected equipment. Identifying a strong emission is insufficient unless there is evidence that it reaches a susceptible part of the system and contributes to the observed problem. Likewise, observing an equipment malfunction does not establish which source or pathway is responsible.

This is why measurement must be guided by an understanding of the system. Depending on the application, an evaluation may examine electric and magnetic fields, conducted disturbances, transient events, common-mode currents, power conditions, or the electrical behavior of grounding and bonding connections. Measurements become useful when they are interpreted in relation to equipment operation, installation geometry, operating schedules, and the conditions under which the problem occurs.

Grounding and bonding are especially important because their performance depends on more than simple continuity. A connection that provides an effective path at one frequency may present substantial impedance at another. Conductor length, geometry, routing, and connection quality can influence how disturbance currents flow. Protective grounding requirements must be preserved while the design addresses electromagnetic performance. A low ground resistance measurement alone does not establish that an installation has effective interference control.

Shielding and containment require similar care. Their effectiveness depends on the field involved, its frequency, the material used, and the construction of the enclosure or barrier. Seams, doors, ventilation openings, cable penetrations, and electrical connections can determine the performance of the completed installation. Low-frequency magnetic fields present different challenges from higher-frequency electric fields and radio-frequency emissions. Selecting a material without examining these conditions can produce a solution that performs poorly in service.

Power quality and electrostatic discharge also belong within this broader engineering perspective. Voltage disturbances, harmonics, switching transients, and interruptions can affect equipment operation, although they require different methods of investigation and correction. Electrostatic discharge can upset or damage susceptible electronics through direct contact or electromagnetic coupling. Addressing these concerns requires attention to both equipment design and the conditions of installation, handling, and use.

Electromagnetic compatibility, or EMC, provides an essential foundation for this work. EMC concerns the ability of equipment to function satisfactorily in its electromagnetic environment without introducing unacceptable disturbances to other equipment. Compliance testing provides evidence of performance under defined test conditions. Actual “real-world” installations introduce additional variables, including cable arrangements, shared infrastructure, nearby sources, and combinations of equipment that may differ from the tested configuration.

Electromagnetic Integrity Engineering™ connects those design and compliance considerations with the conditions of the completed system. It asks whether the equipment, infrastructure, and surrounding environment have been evaluated together and whether the resulting performance supports the intended application.

This approach is particularly valuable during planning and design. Equipment placement, cable routing, interface design, filtering, enclosure construction, and bonding provisions are generally easier to address before installation. For sensitive applications, an electromagnetic site assessment can help establish environmental conditions before equipment is selected or positioned. Early coordination gives owners and designers a stronger basis for decisions that could otherwise require costly changes later.

Verification completes the process. A proposed correction should be evaluated against a defined objective, and its effectiveness should be confirmed under typical or normal operating conditions, as well as a reasonable duration. Documentation should explain what was measured, which conditions were evaluated, what changed, and what limitations remain. Future equipment additions or infrastructure modifications may require further review because they can alter the electromagnetic behavior of the installation.

At Elexana, Electromagnetic Integrity Engineering™ brings these responsibilities into a coordinated engineering practice. Its purpose is to understand how electromagnetic phenomena affect an application, establish appropriate controls, and verify that those controls support reliable operation. The result is a more defensible basis for designing, installing, and maintaining the electrical and electronic systems on which modern facilities depend.