On July 14, 2012 at 00:15, bcf1963 said...
WHAT DO YOU NEED IF ANYTHING IN ADDITION TO A WHOLE HOME SURGE UNIT.
Already answered multiple times:
The IEEE even defines properly earthed 'whole house' protection with numbers. It is not 100%. The IEEE Standard says "99.5% to 99.9% protection".
The IEEE Standard then includes more numbers.
Still, a 99.5% protection level will reduce the incidence of direct strokes from one stroke per 30 years ... to one stroke per 6000 years ...
Why do telcos use properly earthed 'whole house' protectors and not that other (what the NIST calls) "useless" stuff? They suffer about 100 surges with each storm. Must never have damage. Telcos upgrade their earthing massively for just a little bit more protection. Because better protection is only provided by what? Better earthing.
You did not even ask about low impedance. So you must already understand impedance. Knowledge of that basic and relevant electrical concept is important. You did not ask because you already know?
In addition to the 'whole house' unit were many previously posted recommendations for superior protection: separation (ie 'less than 50 meters'), low impedance connection, a 'primary' protection system, understanding what was originally demonstrated by Franklin, etc. But again, your question was previously answered. Why does that make you so nasty?
