Tyco Product
Tyco Product
I would say no guarantees just good design, slope conduits away from buildings to manhole structures with proper base and drainage, link seals on conduit ?cores?, and on the interior of the conduits I have specified a product by Tyco called Rayflate (
http://www.tycoelectronics.com/catalog/cinf/en/c/19998/2110 ). I have even had one owner mock-up and test it to a certain extent and was satisfied, since I have specified, and had it installed on many projects, with no complaints (that I know of) and when it had to be removed it was an easy and clean removal and re-installation in the same duct, according to the installing contractor. Just a thought.