Design Features for TVSS/SPD Safety
Energy (Joule) Ratings
Eureka Future Standards
Filtering and Attenuation
Glossary of Terms
kA Ratings
Lead Length Effects
Lightning Physics and Effects
Mfg and Test Standards
Multiple Pulse Testing
Role of IEEE
Role of NEMA including LS-1
Sinewave Tracking
Specifying TVSS - A Quick Reference Guide (pdf) Standard Testing Waveforms
System Diagram
TranSafe
TVSS SPD and Power Line Filtering
UL 1449 Second Ed Revision (pdf)
UL 1449 Third Ed (pdf)
Verifying UL Listing (pdf)

APT offers Training & Continuing Education:

Professional Engineer PDH’s & CEU’s: APT offers PDH’s qualified & approved by IEEE. In turn, IEEE PDH’s & CEU’s are recognized & accepted by most states including rigorous States of Florida and New York. This course starts with basics and proceeds through advanced topics including UL, IEEE & NEC. Course is Standards-based, not sales-oriented. This course may be the most efficient & comprehensive six hours of TVSS training seminar available. Seasoned engineers appreciate the mix of explaining the science, art and ‘marketing’ surrounding the surge industry. This course is approved for State of Florida PDH’s. Contact lfarquhar@apttvss.com with questions.

Continuing Education Flyer

Electrical Contractor Credits: We are gaining approval on a course specifically for Florida licensed Electrical Contractor credit. Approval is expected Fall 2008/Winter 2009. Contact tmcdonald@apttvss.com.

Lunch & Learn: APT offers LunchNLearn training seminars via GoToMeeting net meetings. These are roughly one hour. Contact psaa@apttvss.com.

Specialized training: We are flexible and can offer special programs for various situations or audiences. Please contact info@apttvss.com.

IEEE, NEMA & UL Standards meetings: These Standards bodies have annual Spring meetings in the Tampa Bay area to discuss & update surge standards. Interested parties are welcome and encouraged to attend these meetings. Contact lfarquhar@apttvss.com for more info.

We want you to be happy with our products. If you have a problem, we want to make it right. Period. Please contact us at (800) 237-4567 or info@apttvss.com.

APT’s standard warranty is ten (10) years. We offer longer warranties as appropriate.

Did You Know? TVSS rarely fail from surges. During normal operation, TVSS can last 20-30 years. TVSS’ number one killer is sustained overvoltage conditions. No TVSS can withstand certain sustained overvoltages. In fact, better units are purposely designed to shut themselves off to ensure passive operation at end of life. As a generalization, no TVSS manufacturer warrants against sustained overvoltages as such events are truly outside TVSS’ scope. This might be analogous to automakers not warranting car accidents. Worded differently: larger problems usually cause TVSS failures and TVSS is the first casualty, much like a canary in the coalmine. Common problems are missing N-G bonds, genset regulation issues, reference to ground problems, etc. APT offers forensic analysis at no cost to help professionals diagnose these problems. Sustained overvoltages often leave telltale clues inside the suppressor. This proves invaluable in many instances.