Overview About Shermco Since 1974, Shermco has become North America’s largest and fastest growing NETA-accredited electrical testing organization. Our focus is to make sure electrical power systems are functioning properly and safely. Additionally, our Professional Engineering Group, Rotating Machinery Division, Renewable Energy Services, and Field Repair and local Repair Service Centers, places Shermco in a position to handle all things electrical, all done with an emphasis on safety and clien…