Customer Support : (804) 355-1100

Specifying Effective Surge Protection

THOR SYSTEMS’ Engineering and Customer Service staff has extensive surge protection and critical power knowledge. We are available to assist with risk assessment, surge protection coordination, specific applications, or installation recommendations and complete site evaluations, as well as answering any questions that may arise.

A “Site Survey Risk Assessment” (TSI 067) is an effective means to identify existing and potential surge protection applications. During a THOR SYSTEMS Site Survey, critical pieces of equipment and processes performing essential business functions are documented which can include a review of their respective historical maintenance expenses and operational availability. These reviews often provide the insight needed to determine poor PQ as the root cause of these problems.

THOR SYSTEMS also offers a full range of PQ analysis. These monitored parameters include: Transients, Harmonics, Over/Under/Peak Voltage and Current Measurements, Power Factor, Flicker and Energy Usage in both kVA and kW. Please contact us to schedule either a ground resistance or PQ Site Survey.

We offer Ground resistance measurements of individual ground conductors, rods and grids using instrumentation specifically designed for non-contact ground measurement. In addition we offer Ground Resistance Testing for three-point analysis (measurements of resistance of ground rods and grids), or four-point analysis (measures soil resistivity).

Schedule a Site Survey to create a Roadmap to Reliability for your company to reduce your maintenance expenses, improve equipment process availability, enhance operating effectiveness and ongoing profitability.

Clamp-on Ground Resistance Meter Taking Ground Resistance Measurement on Wire Connecting the Ground Rod

Portable Power Quality Analyzer used during Site Surveys to Indicate Presence of Transients, Harmonics, & Other PQ Anomalies

Three/Four Point Ground Resistance Test Equipment
















Thank you for your time and interest in THOR SYSTEMS, INC. We look forward to becoming your Power Quality partner and resource for surge protection equipment. THOR SYSTEMS offers products and services that can protect you from the more obvious external to the more frequent internal transient voltage sources. Feel free to give us a call at 804.355.1100 or send an email to if you have any questions or would like additional information.


Electrical power quality problems cost the United States industries over $100 billion annually
80% of voltage surges and transients are caused by changes in electrical demand, inside the user's facility