About Us    History

The Tri-M Group, LLC is a full service electrical contractor providing quality service for nearly 50 years in the Mid Atlantic Region. We focus on your Facility Life-Cycle costs by providing quality up front to minimize your long term maintenance issues.

2012 Tri-M Aquires Hanna Electric. (press release)
2003 Tri-M opens Ohio office.
2002 Jim Horn becomes a co-owner with Tom Musser and assumes the position of CEO; The Tri-M Group, LLC is formed.
1990 Tri-M opens branch in Allentown, PA.
1989 Tri-M celebrates its 25th Anniversary. Tri-M Network Services is formed.
1988 Tri-M BAS Service Group is established.
1979 Name is changed to Tri-M Corporation with Tri-M Electrical Construction and Tri-M Building Automation Systems as divisions.
1978 Tri-M moves offices to current Kennett Square location. Tri-M Building Automation Systems is formed.
1972 Tom Musser becomes sole owner and Tri-M is incorporated.
1964 Tri-M Electrical Contractors is founded by Tom and Dick Musser.